A Cooler Barn Supports Stable Milk Production During Summer
In brief Heat stress reduces cow welfare and milk yield during warm periods. The HP-19 air conditioning unit provides targeted cooling in barns without permanent installations. Cooler, drier indoor air supports feed intake, resting behaviour and a consistent milking routine. The solution is flexible and easy to move between different areas and uses. Summer heat on dairy farms often shows first in animal behaviour – and eventually in the milk tank. As temperatures rise, even small changes in barn conditions can influence how cows eat, rest, and attend milking. Heat is therefore one of the key challenges in modern dairy farming, affecting both productivity and animal welfare. Targeted cooling with the Rex Nordic HP-19 air conditioning unit offers a practical way to manage the effects of warm weather in everyday farm operations. Heat stress starts at lower temperatures than many expect Heat stress is often associated only with extreme heat waves. However, research and expert guidance indicate that dairy cows can begin to suffer from heat stress when barn temperatures reach around 20 °C, particularly when humidity levels are high. In these conditions, cows must divert energy towards regulating body temperature instead of feed intake and milk production. Livestock buildings typically heat up quickly as outdoor temperatures rise but cool down slowly. This means that heat stress thresholds are easily exceeded indoors, even during relatively short warm spells, and the effects may persist after outdoor temperatures fall. For dairy cows, the optimal ambient temperature is below 18 °C. Once temperatures exceed 20 °C, cows reduce feed intake and rumination, which can quickly lead to lower milk yields – especially in high-yielding animals. Production losses quickly affect farm profitability The effects of heat stress are not limited to prolonged heat events. Studies show that even short periods of elevated temperature can reduce milk yield by several litres per cow per day. During extended hot conditions, losses of up to 4–5 kg of milk per cow per day have been documented. In exceptionally warm years, the number of hot days can rise significantly even in northern regions. In Finland, for example, the summer of 2018 recorded around 40 hot days in the south and approximately 20 in Lapland, with milk yields remaining below normal levels for up to four months in many years. Targeted cooling as a practical barn solution The Rex Nordic HP-19 air conditioning unit offers a practical option where efficient yet flexible cooling is required without permanent installation. Designed for professional use, it is well suited to environments where heat load fluctuates throughout the day. Cooler and drier conditions for the animals The HP-19 produces cooled, dehumidified air that can be directed precisely where it is needed via separate air ducts. In a dairy barn, this may include milking robot waiting areas, feed table edges, or resting zones where cows spend most of their time. Research indicates that targeted cooling in animal living areas is more effective than cooling an entire building, as it directly influences feed intake and resting time. By cooling the right locations rather than the whole structure, effective results can be achieved with lower energy demand. The solution is also easy to scale for barns of different sizes, with multiple units positioned according to heat load if required. Cow behaviour indicates successful cooling Farm experience and research both show that the benefits of cooling become visible quickly in cow behaviour. Heat stress reduces resting time and feed intake, which directly impacts milk production. When indoor conditions remain comfortable during warm weather, cows expend less energy on cooling their bodies. They eat more normally and rest longer, helping to reduce the negative effects of heat stress and maintain more consistent production levels. A cooler barn environment also encourages cows to return indoors during warm nights, supporting a steadier milking routine and improving overall utilisation of the milking system. Drier air supports air quality and udder health High temperatures combined with high humidity place additional strain on animals and reduce indoor air quality. Heat stress has been linked to increased somatic cell counts, often associated with compromised udder health. Mastitis can reduce the milk yield of an affected cow by 4–10 %. Studies show somatic cell counts are typically highest in the end of summer. The HP-19 removes moisture from the air during operation, helping maintain a fresher, more comfortable barn environment for both animals and staff. Condensed water is collected in an internal tank, with emptying being the only regular maintenance task. Improved working conditions for staff Working in barns during warm weather is physically demanding. Targeted cooling improves comfort in milking areas, feeding zones, and service spaces. Reduced heat load improves stamina, safety and overall working conditions. An effective response to summer heat challenges The Rex Nordic HP-19 provides a fast and practical way to improve barn conditions as temperatures rise. Targeted cooling, humidity control and mobility make it a versatile solution for a wide range of dairy operations. When animals feel better, production remains more stable – and working conditions improve at the same time. The cost of heat stress on a dairy farm Example farm: 100 lactating cows When the barn’s average daily temperature remains above +20 °C: Milk yield may drop by 4–5 litres per cow per day Total production loss: 400–500 litres per day Per month (30 days): 12,000–15,000 litres less milk Average producer milk price (May–July 2023): €0.5135 per litre Economic impact: Per day: €205–257 Per month: €6,156–7,700 The calculation is based on production losses observed in research and academic studies on heat stress (Hulsen 2009; Holma 2020; Jääskeläinen 2020).
Airrex Diesel Heaters Keep a Scottish Rally Workshop Running
A professional rally team in Scotland heats its workshop with three Airrex diesel infrared heaters, the oldest of which has been operating for around 12 years. Fuel consumption is extremely low and noticeably lower than their previous noisy, smelly diesel blowers. Reliability is described as “fantastic,” with minimal maintenance required. The heaters travel with the team to international rally events to keep service areas warm. In the Scottish Borders, where cold, damp winters are a part of daily life, a professional rally team has created a workshop environment capable of meeting the demands of world-level motorsport. Their facility in Kelso includes several work areas: the main workshop, a dedicated transmission and engine rebuild room, and a paint shop. Much of the building is insulated, helping maintain stable temperatures during the winter workloads. The team operates a full rally car programme, building, preparing, repairing, and rebuilding modern machines that compete in championships across the globe. Reliability, precision, and well-controlled working conditions are essential — both for the team and for the cars. Twelve Years with Airrex Infrared Heaters The workshop runs three Airrex diesel infrared heaters, the oldest of which has been in continuous use for roughly twelve years and still performs flawlessly. According to owner Dommy Buckley, Airrex stood out immediately: “They’re a class apart. Very economical and so clean burning. You can’t get better.” The heaters are used seasonally but run every day throughout the winter, from October to April. The team also transports their Airrex heaters to colder international rallies in France, Finland, and Norway, relying on them to warm service areas in harsh outdoor conditions. Stable Heat from a Mobile Heater — Even with Doors Constantly Opening The workshop has a gable-top roof with a high peak, which can easily allow warm air to rise and escape. To counter this, the team uses a small fan to push warm air back down into the work area. Combined with Airrex’s infrared technology, this keeps the space warm and consistent even when doors are frequently opened. According to Buckley, “It works a treat.” Fuel Efficiency That’s Hard to Believe Fuel consumption is one of the first things people ask about — and it’s where the team has seen one of the biggest improvements. Buckley laughs when he talks about it: “It’s like nothing! Honestly… we’re a spreadsheet-free environment, but it’s easy to work out they’re efficient.” Airrex diesel infrared heaters are designed to use significantly less fuel than traditional blown-air diesel units, and the team experiences this every day in both running costs and overall comfort. Before switching to Airrex, they relied on older heaters that Dommy remembers all too well: “Terrible, noisy, smelly prehistoric machines.” The difference was immediate. With Airrex, fuel consumption dropped sharply, exhaust odour disappeared, and the workshop became quieter, cleaner, and far more pleasant to work in. Maintenance and Reliability of Their Diesel Heaters While the team has occasionally used a Service Kit, most of the maintenance is now handled by Rex Nordic’s Darren, whose expertise makes the whole process effortless. As Buckley says: “Darren’s skills are much better and easier to just get him to do it!” Reliability is another area where the heaters shine. When asked to summarise over a decade of use — both in the workshop and on the road — Dommy doesn’t hesitate: “F A N T A S T I C ……” The heaters require very little attention, deliver stable heat in any environment, and have become a trusted part of the team’s operations. Dommy recommends them widely: “I’ve recommended them to a lot of people. All spaces — they work anywhere, really.” From insulated workshops to temporary outdoor service zones at international rally events, Airrex diesel infrared heaters have proved to be dependable partners wherever the team goes. Motorsport Workshop (Scotland) Type: Rally car workshop Structure: Mostly insulated, gable-top roof Heating: Three Airrex diesel infrared heaters (oldest ~12 years) Usage: Daily from October–April Previous heating: Noisy, smelly, blown-air diesel units Fuel use: Very low (“like nothing”) Reliability: Excellent, trouble-free Maintenance: Minimal; serviced by Rex Nordic technician Extra use: Taken to rally events abroad
Flexible local cooling for expanding Swedish company
When the summer sun burns on the 4,700 m² workshop roof at the company Kvarnstrands in Småland’s Ekenässjön, 8 Rex Nordic Eco Coolers now keep the temperature in the premises at a pleasantly cool level. Inside the workshop of the family company Kvarnstrands, 50 of the total of 95 employees work at several different machines to manufacture and sharpen top-class cutting tools for the wood industry in Europe. The machines used are CNC machines, washing machines, oil purifiers, and robots. In recent years, the business has grown, and with more heat-generating machines in the premises and with restrictions on ventilation on the facade, the indoor climate during the summer months has become a challenge for the company and its employees. Maintenance manager Alexander Sellman did careful research on which cooling solutions could work for the company’s needs – today and also in the future. -Our business is constantly developing, and we need a flexible solution for cooling the premises, says Alexander, who has worked at Kvarnstrands for 17 years. Based on changed EU regulations in the future, the choice of cooling medium was an important issue for us to take into account. Kvarnstrands took help from Rex Nordic’s technical sales advisor in Sweden, Jon Lindahl, to find the best solution for their conditions. The choice fell on 8 REX14000, which are deployed in strategic locations in the premises. -We are noticing that many companies in the manufacturing industry have the same challenges, and it is very rewarding to be able to assist with affordable solutions with the launch of the Eco series, says Jon Lindahl. Kvarnstrands was founded in 1939 in Ekenässjön and the business premises have been expanded several times since then. To be able to shop locally was an important factor in why the choice fell on RexNordic. -We prefer to shop from our neighbours and here we were able to buy the machines through Axima in Vetlanda and get good and fast help and support from a Swedish salesperson, says Alexander. At Kvarnstrands, the evaporative coolers are running throughout the working hours. And the employees have found clever ways to keep the tanks filled and maximize the cooling effect. -We exercise our fire hoses and fill the coolers directly with them, says CNC technician Violand Tiku, who also puts a few ice cubes in the water to get extra efficient cooling when the outside temperature reaches above 30 degrees Celsius. The coolers were delivered just a couple of weeks ago and the employees are already experiencing less heat stress. -Yes, there is a big difference and it is very nice with the cooler air, says Sara Vilhelmsson, CNC operator. Another advantage is that the coolers are energy efficient, the REX14000 model draws only 510W, and can easily be connected to a standard 10A outlet in the room. Violand Tiku has a REX14000 placed about 10 m away and he appreciates the coolness a lot. -It’s really great, he says enthusiastically. Previously, I only had two normal room fans in this corner, but with the coolers’ adjustable fan I can adjust the airflow myself and adapt it based on the outside temperature. Jon Lindahl sees an increasing interest in evaporative coolers in many different businesses, including in milk production and the entertainment and event industry. -These coolers really create many great opportunities for RexNordic to reach new customer groups and I look forward to continuing to develop sales, he says. Contact sales to to hear more
Vantaa Gym Gets Cooler and Fresher with EcoCooler
In Havukoski, Vantaa, the Vantaa Gym Club acquired a Rex Nordic EcoCooler at the beginning of summer 2024. Customers of this family business, which has been operating for over 30 years, immediately noticed from the first days that the air in the gym was pleasantly cooler and fresher than before. Vantaa Gym has a gym area of 600 square meters with a height of over six meters. The company purchased a mid-sized REX25000 model from Rex Nordic’s EcoCooler range, which has an air flow of up to 25,000 cubic meters per hour. The cooling capacity of the movable EcoCoolers is heavily based on the evaporation of cold water through a honeycomb pad. The advantages of the cooler include efficient cooling without water mist, large air flow, low energy consumption, and no installation costs. “There is a clear temperature difference in the hall when the EcoCooler is in use. Customers have praised how pleasantly cooler and fresher the air is”, says Mika Holappa, owner of Vantaa Gym. At Vantaa Gym, the REX25000 was placed on the second floor in the treatment room, from where the cooler blows into the gym through an open interior window. This way, the cooler did not need to be placed among the gym equipment or people, and the cool air spread widely in the hall as it fell down. “We really didn’t have the opportunity to acquire any other solution for our premises. We rent from the city, and in the same “hectare-sized” hall there are other businesses, so we cannot, for example, install fixed cooling solutions. At first, I thought of buying ten smaller fans scattered around the hall, but then I discovered the EcoCooler on the internet and decided to try it.” “When the sun shines strongly through the skylights, the hall has been extremely hot and, at worst, felt like “the oxygen is running out”. There is basic ventilation in the hall, but it is not sufficient in hot weather. It helps to circulate the air and push cool air down while also bringing replacement air into the room, but nevertheless, the EcoCooler has done its job. In cooler weather, I have had it on half power. When it has been warmer, the fan has been on full power.” In addition to the REX25000, Rex Nordic’s EcoCooler range includes the smaller REX14000 and the larger REX48000. They are designed for different sizes of rooms, run on standard power, and do not require fixed installation or electrical work. Water directly from the hose to the tank The REX25000 has practically been constantly connected to the water supply at Vantaa Gym, which means that cold water has been constantly flowing into the EcoCooler tank. The water has been consumed in moderate amounts relative to the benefit, and there have been no humidity problems due to the EcoCooler in the hall. The water evaporates from the EcoCooler; it does not spray or cause water mist. “In hot weather, the water is constantly on. I also tried the cooler by simply filling the tank. In that case, the tank (170 litres) used water in 8-10 hours”, estimates Holappa. The open and bright Vantaa Gym has a versatile gym with modern equipment, where professional guidance is available if desired. At Vantaa Gym, one can also purchase gym programmes as well as personal training, physiotherapy, massage, and nutrition advice. The gym also allows for boxing or focusing on stretching exercises. There is a traditional sauna in the men’s changing room and an infrared sauna on the women’s side. There is also a play area for children. “It is important for us to listen to our customers and purchase equipment according to their wishes and needs. Our gym is accessible via an app around the clock every day. One can also purchase only the services needed, even for a single visit in the middle of the night. We do not bind our customers to anything.” Vantaa Gym is located at Hosantie 2, Vantaa. Vantaa Gym Club https://vantaagym.fi
Melting snow and ice with Airrex AH-800 heater
Founded in 1995, Amados Oy is specialised in the marketing and sales of machines related to construction, agriculture and property maintenance in Finland and Russia. The heater Airrex AH-800 was acquired to heat Amados’ workshop hall approximately 2.5 years ago, and it has been in heavy use ever since. Mikkeli-based Amados’ hall is 5–6 metres high and spans approximately 150 square metres, and various working machines are washed there throughout the year. At worst, half a metre of snow may pile up on top of vehicles such as wheel loaders and tractors in winter when they are driven to the hall for washing. “It only takes around three hours to deal with a large amount of snow and ice until it’s all melted away. The heater is in heavy use at that point, but it works superbly,” says Jari Ikonen from Amados. Previously, hot-air blowers were used for heating in Amados’ hall but, according to Ikonen, they were susceptible to becoming dirty. Airrex has no such issues. The diesel-powered infrared heater AH-800 is in continuous use at Amados in the cold season, and 800 litres of fuel is consumed annually. The heater is in heavy use, indeed. READ MORE ABOUT AH-800
Airrex AH-300 helped cut a garage’s costs significantly
Two years ago, Riku Turunen from Kontiolahti was considering the heating costs of his industrial hall. It consumed a lot of power and the bills really reflected that. Things had to change in a sensible manner. Riku’s garage hall is 135 square metres in size, and the highest point of the roof is at four metres. The large roll-up doors are prone to waste heat, so the task was a challenging one. Airrex AH-300 was selected as the heating device. AH-300 is an almost odourless, diesel-powered infrared heater with a 100% efficiency that is very well suited for industrial halls such as Turunen’s garage. Practice showed instantly that Airrex was a great solution because the device was easy to use as well as cost-efficient. “I must say that over the past two years, I’ve noticed how reliable and easy this device is to use. It’s mainly been in one place, and I’ve had no need to do anything to it although I’m using it all the time.” Besides convenience, savings are playing an important role now. “Earlier, if a period of, say, three weeks incurred an expense of a little more than €680, now I’m only spending €370, fuel included. Annually, that’s quite a big sum of money,” Turunen ponders. Once again, all that was needed was one device to solve issues. Airrex AH-300 reduced heating costs, and Riku Turunen can now focus on the essential – conducting his business – without any worries. READ MORE ABOUT AIRREX AH-300
Terrace heater, hall heater and BBQ hut heater – Airrex AH-300
Harry Mäkelä has an impressive terrace in his house. Mäkelä uses his grill a lot in winter, so the Airrex infrared heater may be switched on from Friday until Saturday. “We used to use this duct-shaped fuel oil heater. We found its flame and blast slightly dangerous in terms of heating a BBQ hut constructed of log beams with a diameter of 20 cm. A few years ago, when my son acquired an infrared heater and put it by the door of a 200-square metre maintenance hall as a kind of an air curtain, I decided to get these devices for our personal use as well. In temperatures of 20 degrees below zero, we consume around one litre of oil per hour in the BBQ hut. The 2-storey terrace is 17 metres wide and 5 metres deep. One Airrex AH-300 heater is in the lower terrace and one is upstairs. When we had to start refuelling the old heater with fuel oil, the tank of the new heater, in comparison, remains almost half-full,” Mäkelä describes his experiences. In Mäkelä’s experience, an exhaust pipe is not necessary in a big terrace or even in a BBQ hut. The heater does not emit any smoke at all because the oil burns so cleanly. Switching off the heater only causes a small fizzling sound, after which you can smell fuel oil for a while. Mäkelä, however, reckons that the consumption and odour emissions of older Airrex infrared heaters could be reduced if at least their filters were replaced. The heaters have been used for 3–4 years without requiring any particular maintenance. “I can warmly recommend these heaters to everybody, I have been very satisfied with them,” Harry Mäkelä says, summing up his experience. READ MORE ABOUT DIESEL HEATERS
Flower friendly Airrex AH-300 infrared heater solves greenhouse heating problem
Three years ago, at the Munkkivuori Garden, it was considered how the premises would be kept warm and the flowers happy. The gas heater didn’t work, but the diesel-powered Airrex AH-300 was chosen as the right heating solution. The garden has a smaller store section and a larger greenhouse. The entire space is about 5 meters wide and 30 meters long. Initially, they purchased one heater, but very quickly they bought another to the store section. The product has been very easy to use and working perfectly. Now the company has even bought a third heater. – We have been very pleased with these infrared heaters. Two of them are constantly in use and the third is used when needed. On the greenhouse side, the heat is kept at just under ten degrees Celsius and then at the store again at 13-14 degrees Celsius, says store manager Aki Lahtinen. ”Cost-wise, I can say that Airrex is much cheaper than gas heaters” The AH-300 has a charm of comfort and the flowers are happy. The device is almost odorless and produces carbon dioxide, which is great in such an environment. The 15kW / h heating output is just optimal and the low fuel consumption has brought the desired cost efficiency. Workers do not have to worry about using the equipment, just refuel and let the heater do its job. – Yes, these are easy to use, all you have to do is refuel. In terms of cost, I can say that it is much cheaper than gas-fired heaters, says Lahtinen. The Airrex AH-300 has many things that make it easy to use in such spaces. It can be easily moved and does not require a separate exhaust pipe. It is almost odorless and does not make any noise. Infrared radiation heats the material instead of the air. No fan is needed so dust or other contaminants do not rise from the floor. All in all, the Garden has been very satisfied with Airrex heaters. The thermostat-controlled heater is set at the desired temperature and then everyone can concentrate on the essentials. Read more about AH-300
Airrex diesel heater – lasting warmth and proven savings
Good heating isn’t just about raw power – it’s about efficiency, comfort, and control. Airrex diesel infrared heaters have proven that steady warmth doesn’t have to mean high running costs. The following real-world examples show how Airrex keeps large workshops, warehouses and industrial spaces warm throughout the winter – while keeping fuel use impressively low. Proven results with infrared heating: only 2.5 litres per day Many people are surprised to discover how little fuel Airrex diesel heaters actually use. They are designed to heat spaces evenly and efficiently, without wasting energy where it isn’t needed. Grels Ström, a retired technical expert from Rex Nordic, uses an Airrex heater in his 480 m³ warehouse. The building has ceiling insulation, plasterboard walls, and a concrete floor – a structure that holds heat extremely well. Previously, the space was heated with direct electric heating, but switching to diesel has cut both consumption and costs dramatically. Ström explains: “At first, fuel use can be a little higher. It usually takes about a week or so for consumption to settle. Infrared heat is absorbed directly into the structures, and once they’re properly warm, surprisingly little fuel is needed to keep the temperature steady.” He maintains an indoor temperature of +15 °C even when it’s around 0 °C outside, and daily fuel consumption averages just 2.5 litres of diesel. His Airrex heater has run reliably without any issues or need for servicing. A brief period of higher consumption at the start is perfectly normal – the building materials often contain moisture that needs to dry out first. Once they’re dry, the system reaches maximum efficiency. This is where Airrex infrared technology excels: the heat is stored in the structure and released steadily back into the space. After that, only short heating cycles are needed to maintain comfort – and the savings are clearly reflected in the fuel bill. Smart thermostat keeps consumption under control Every Airrex infrared heater is equipped with an intelligent built-in thermostat that keeps fuel use to a minimum. The unit starts and stops automatically to maintain the desired temperature. Diesel is metered precisely – only as much as needed and not a drop more – which keeps consumption extremely low. In everyday use, the heater runs independently. Once the building’s structures are warm, the unit maintains a steady temperature with short operating cycles. There’s no need for constant adjustment – the thermostat does it all automatically. Unlike traditional fan heaters, Airrex units don’t blow hot air towards the ceiling or outside when doors open. Infrared heat is directed straight into walls, floors, and machinery, which absorb and store the warmth. As a result, energy use stays exceptionally low, and if a door is opened, the stored heat quickly restores the indoor temperature. Long-term savings with Airrex diesel heaters Markku Ojanen has experienced the same results first-hand. He heats a 360 m² insulated hall, three metres high, which used to rely on radiators and fan heaters. The old system consumed around 2,500 litres of oil each year. After switching to an Airrex AH-300 diesel heater, the difference was immediate. In the first winter alone, fuel use dropped to about 1,000 litres per year – less than half of what it was before. He keeps the hall at +9–10 °C, raising it to +13 °C while working. Over ten years, the savings have totalled around £8,500–£9,000, and the same heater is still operating flawlessly today. “Maintenance has always been done on time, but it’s never needed a single repair,” Ojanen says. “It just keeps running.” Sustainable warmth you can feel Airrex infrared heating works on a simple but powerful principle: instead of heating air, it radiates warmth directly into surrounding surfaces. Floors, walls and equipment absorb the heat – just like sunlight warms your skin on a cool day. Once these surfaces are warm, they release the heat evenly back into the room, creating a consistent indoor temperature. This stored warmth acts as a natural heat buffer, which keeps fuel consumption low after the first weeks of use. The heater only runs as much as is needed to maintain the balance. That’s the key difference between infrared and traditional fan heaters. Infrared heat doesn’t escape when doors open or air moves. The stored heat within the structure quickly restores the temperature, keeping warmth where it’s needed and savings ongoing. Site 1 – Warehouse Type: Warehouse 480 m³ Structure: Concrete floor, insulated ceiling, plasterboard walls Previous heating: Direct electric New solution: Airrex diesel infrared heater Maintained temperature: +15 °C in mild winter conditions Average daily fuel consumption: ~2.5 litres of diesel Maintenance: Reliable operation, almost no servicing required Savings: Considerably lower consumption compared with the previous system Site 2 – Industrial hall Type: Insulated hall 1 080 m³ (360 m², 3 m height) Previous system: Radiators + fan heaters Previous fuel use: ~2,500 litres of oil per year New solution: Airrex AH-300 diesel heater Current fuel use: ~1,000 litres per year Years in use: 10 years Estimated savings over 10 years: £8,500–£9,000 Reliability: Same unit still operating perfectly, no repairs needed
Warmth that stays – Airrex heater keeps the workshop comfortable all winter
Keeping a 244 m² car repair workshop warm in winter is no simple job, especially with six-meter-high ceilings, concrete walls, a partly insulated sheet-metal roof, and a door that opens constantly. In Finnish winter conditions, heat escapes fast. With an Airrex diesel space heater, the indoor temperature stays at a steady +16–17 °C throughout the winter. Janne Mukkala, owner of JM-Konehuolto Oy from Finland, has used his Airrex for six years – and wouldn’t switch to anything else. “The heater has worked flawlessly. When the door opens and the temperature drops, it starts automatically and brings the heat back quickly. Reliability is what I value most.” A fuel-powered heater that supports district heating in freezing weather Before installing the Airrex unit, the workshop temperature fluctuated constantly during the winter. District heating alone wasn’t enough to keep the workspace warm, especially when the overhead doors were opened in sub-zero conditions. The Airrex diesel heater provided the missing boost. “Now we can open the door whenever we need to without losing the indoor warmth,” says Mukkala. “Airrex reacts quickly to temperature changes and supports the district heating really well.” For garages and workshops where effective, clean heat is needed without complex installation, Airrex is an excellent choice. At JM-Konehuolto, the heater runs daily throughout the winter, sometimes overnight. Airrex – easy to use and built to last The Airrex infrared heater has been operating for six years without a single service requirement. “I’ve never had to do anything to it – it just works.” Airrex technology is designed with simplicity in mind. Thanks to its advanced oil-burning system and clean combustion, the heater is almost maintenance-free. It runs quietly and without odour, smoke or fumes inside the workshop. For best performance, we still recommend replacing the annual service kit to maintain efficiency and long-term reliability. A satisfied user – warm workshop, minimal effort Simple, reliable, and economical – that’s how many Rex Nordic customers describe the Airrex heaters. “It has been the most reliable heating solution we’ve ever had,” says Mukkala. Airrex complements district heating system perfectly, keeping the workshop warm all winter, even with imperfect insulation and frequent door openings. Who is the Airrex diesel space heater for? The Airrex diesel space heater is designed for demanding environments where consistent warmth, fast recovery, and ease of use matter. It performs exceptionally well in garages, repair shops, warehouses, and workshops – especially in spaces where doors open frequently and indoor heat is easily lost. Thanks to its mobility, the unit can be moved wherever warmth is required, making it a practical solution for busy work areas with changing layouts. It’s also a reliable option in locations with limited electrical power, providing steady, clean heat even when traditional heaters struggle to keep up. Facts: JM-Konehuolto Oy, Finland Type of business: Car repair workshopFacility size: 244 m² | Height 6 mStructure: Concrete walls and floor, partially insulated metal roofHeating solution: District heating + Airrex AH-800i diesel space heaterUsage: Daily during winter, occasionally overnightIn operation: 6 years | No maintenance requiredMaintained temperature: +16–17 °C