Keep your machinery cool and precise with Rex Nordic HP units
In this article: How heat affects precision machinery and compressors Why spot cooling is critical for uptime and performance Key features of the Rex Nordic HP-19 and HP-60 units The benefits of mobility, energy efficiency, and air quality control What can go wrong without proper cooling How spot cooling works: the technical edge In modern industrial environments, where precision and reliability are essential, the ability to manage heat around equipment is vital. From compressor rooms to CNC machines, controlling thermal loads ensures not only operational continuity but also product quality and component longevity. Industrial machinery, especially those operating within tight tolerance parameters, requires stable thermal conditions to avoid performance degradation. The Rex Nordic HP-19 and HP-60 air conditioners offer a dependable solution to these challenges with powerful industrial spot cooling. What can go wrong without proper cooling? Inadequate cooling in industrial environments can have a cascade of negative effects: Overheating can trigger system shutdowns or damage sensitive motors and drives. Expansion from thermal stress can misalign spindles or deform components. Increased wear on tools reduces service life and machining accuracy. Production rejects rise due to dimensional inconsistencies in workpieces. Uncontrolled humidity can lead to corrosion or condensation-related malfunctions. These risks underline why investing in a robust, portable cooling system is a preventive measure that pays off in equipment protection and production quality. Precision cooling for critical components Modern manufacturing demands tight tolerances, often in the micrometer range. Even minor heat fluctuations in motors, spindles, or tool housings can lead to expansion or contraction that compromises performance. The Rex Nordic HP-19 and HP-60 units deliver targeted spot cooling directly to heat-sensitive machinery components, helping to prevent thermal drift and ensuring dimensional stability during operation. This machinery overheating prevention is particularly beneficial in confined compressor rooms, where heat generated from constant operation can quickly accumulate. By directing cool air precisely to overheating zones, these units prevent costly downtimes and extend equipment lifespan. Designed for demanding industrial conditions With capacities of 5.6 kW and 17.5 kW respectively, the HP-19 and HP-60 support air volumes up to 2117 m³/h. This level of cooling is indispensable for precision machinery where excessive heat can lead to axial expansion, spindle misalignment, or reduced cutting accuracy. They also manage humidity effectively, which is critical in preventing condensation that can impact electronic controls and sensitive components. The ability to remove up to 197 liters of moisture per day makes them suitable even for moisture-intensive industrial zones. How spot cooling works Spot cooling is a technique that focuses cooled air precisely at heat sources such as motors, compressors, or CNC spindles, instead of cooling the entire space. This is done using ducted airflow, which minimizes energy use while maximizing temperature control at critical points. It is especially effective in industrial environments where localized overheating affects only part of the system. Rex Nordic units can be ducted and repositioned as needed, giving operators flexibility to adapt to layout or equipment changes. Adaptable and portable for evolving industrial needs As production setups shift and expand, so do cooling requirements. The mobility of Rex Nordic’s portable industrial air conditioners allows them to be quickly deployed wherever needed without the constraints of fixed installations. Whether it is spot cooling a CNC spindle, protecting automated systems, or keeping hydraulic motors within operational temperatures, these units deliver flexible cooling solutions for industrial equipment. Air quality control for enhanced equipment reliability Industrial environments often face airborne contamination from dust, metal particles, or process emissions. With optional HEPA filtration (MERV8 or H13-grade), Rex Nordic units also improve air quality, reducing the risk of contaminants impacting high-speed motors or control systems. Energy efficient and environmentally conscious esigned for professional use, these systems balance performance with efficiency. The HP-19 operates at just 2.3 kW for cooling, while the HP-60 tops out at 8.8 kW. Coupled with refrigerants that feature a low Global Warming Potential (GWP), they represent a smart choice for operations looking to reduce both costs and carbon footprint. These energy-efficient industrial cooling units support sustainability without sacrificing performance. Because only the necessary equipment or areas are cooled, there is rarely a need to control the temperature of the entire facility. This targeted approach results in substantial energy savings over time. From tightly packed compressor rooms to high-precision machine tools, controlling heat is crucial to maintaining performance and reducing reject rates. The Rex Nordic HP-19 and HP-60 provide a reliable, mobile solution tailored to the needs of professionals. If your operations rely on uptime and consistent peak performance, now is the time to invest in precision cooling that performs when it matters most. Read more about HP air conditioners Contact sales
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 heaters – An eco-friendly choice with renewable diesel
Airrex heaters are the perfect choice for those looking to reduce their carbon footprint without sacrificing performance. These heaters operate efficiently on both traditional diesel and fossil-free renewable diesel, ensuring 100% fuel efficiency and low fuel consumption. Summary Airrex heaters run on both traditional diesel and fossil-free renewable diesel, reducing carbon emissions. Innovative technology maximizes fuel energy use, ensuring low fuel consumption. In many cases, renewable diesel is a more eco-friendly heating option than electricity, especially in regions where power is generated from fossil fuels. Using renewable diesel for heating is a tangible step toward a fossil-free future, and Airrex heaters support this transition without compromising performance. Efficient and clean heating without emissions Airrex heaters utilize advanced fuel-efficient technology, ensuring all fuel energy is fully utilized. Their three-phase system directs infrared heat waves straight into the surrounding area. This method not only saves energy but also enables precise heat targeting with reflector structures. As a result, heating with Airrex is both economical and environmentally friendly. Renewable diesel – The environmentally friendly heating solution Diesel often gets unfairly associated with fossil fuels, yet modern diesel technology has evolved significantly, allowing for clean and efficient use of fossil-free fuels like renewable diesel. This sustainable fuel is a viable alternative for both heating and transportation, offering a significant reduction in environmental impact. Airrex heaters are at the forefront of this progress. With cutting-edge product development, Airrex heaters function seamlessly with renewable diesel, which is not always the case with conventional diesel heaters. When using renewable diesel, Airrex heaters significantly reduce emissions compared to electric heating systems—especially in countries where electricity production still relies heavily on fossil fuels. This makes renewable diesel an eco-friendly alternative with a lower environmental impact. Electricity vs. renewable diesel in heating Comparing renewable diesel to electric heating, renewable diesel is often the more sustainable choice. For example, in the EU, the average CO₂ emissions from electricity production range between 200–300 g CO₂/kWh, meaning that electric heating can have a higher carbon footprint than a fuel-burning heater using renewable diesel. Airrex heaters not only reduce dependence on fossil fuels but also offer significant energy savings. This makes them an ideal heating solution for large spaces requiring constant and efficient heating, such as garages, industrial halls, warehouses, and construction sites. A fossil-free future Reducing fossil fuel consumption is a key part of building a sustainable future. Using renewable diesel for heating is a tangible step towards a fossil-free world, and Airrex heaters make this transition easy—without compromising performance or usability. The benefits of renewable diesel extend beyond emissions. Its production supports local circular economies, as raw materials can be sourced locally, and manufacturing can be conducted regionally. This not only supports ecological goals but also benefits local economies. Airrex heaters exemplify how modern technology can drive the shift toward a more sustainable future. Airrex heaters are next-generation solutions for eco-friendly and cost-effective heating. They are the ideal choice for businesses that prioritize sustainability, efficiency, and responsibility. Discover our selection of diesel heaters today! Renewable diesel vs. biodiesel – Which is better? Renewable diesel (HVO) is technically superior to biodiesel (FAME, RME) due to: Compatibility: Works directly with existing diesel engines Better cold-weather performance Greater emission reductions More consistent fuel quality, regardless of raw materials Biodiesel is cheaper to produce but comes with technical issues and lower environmental benefits. EU regulations limit biodiesel blending in diesel fuels to 7%, whereas renewable diesel has no blend restrictions and can be used in pure form. We recommend using only renewable diesel in Airrex heaters. Biodiesel (FAME, RME) must not be used.
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
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
Field Test of the BX e-Generator: Fuel Consumption Reduced by 83%
Construction sites need electricity around the clock, but the demand can vary significantly. In many cases, a diesel generator continues to run even when power is not actually needed. This leads to unnecessary fuel consumption, emissions, and wear on the generator’s engine. The BX e-Generator from Rex Nordic provides a smart solution to this problem. It acts as an energy storage unit that automatically starts and stops the diesel generator and stores power for peak demand. As a result, fuel is consumed only when truly needed. The BX e-Generator was tested for two weeks on a Finnish construction site. The goal was to determine what kind of savings and practical benefits the system delivers in real jobsite conditions. Clear Results After a Two-Week Test The BX e-Generator was connected to a 12 kVA diesel generator that supplied power to the site. BX controlled the generator automatically, starting it only when required. Most of the time, electricity came from the energy storage, so the engine did not need to run unnecessarily. The results speak for themselves: Fuel consumption decreased by 83 percent, equal to a saving of 1538 euros CO₂ emissions were reduced by 83 percent, or 2538 kilograms of CO₂ Diesel generator operating hours decreased by 320 hours in two weeks An Easy and Worry-Free Solution According to test users, the BX e-Generator was very easy to operate. It worked fully automatically and required no additional training. “Using the device was extremely simple. It started the generator on its own and maintained a stable power supply. We didn’t need to do anything,” one of the test users said. Refuelling frequency dropped, noise and emissions decreased, and power interruptions on the site were practically eliminated. The diesel generator’s lifespan also increases as operating hours and service needs decline. A Hybrid System That Pays Itself Back Quickly Together, the BX e-Generator and a diesel generator form an efficient hybrid power system. The diesel generator provides electricity when consumption is high, while BX delivers quiet and economical power during lighter loads. The more than €1,500 saved in just two weeks shows how quickly the system pays for itself, especially on sites where generators normally run for long periods. Technology That Makes a Difference The BX e-Generator is a complete energy management system. Capacity options range from 6 to 72 kilowatt-hours, and multiple units can be connected to create a larger system. The unit can be charged from the grid, a diesel generator, or solar panels. The automatic control system always selects the most efficient charging method. The PowerBoost function provides up to three times the nominal output for short periods. The system is delivered ready to use with no complex installation required. IP54 protection ensures resistance to dust and water splashes. BX e-Generators are manufactured in Europe, and the batteries are 99 percent recyclable. A Versatile Solution for Many Industries The BX e-Generator is ideal for construction sites, industry, agriculture, tunnels, and events — essentially anywhere without easy access to the electrical grid. It is also used as backup power and as part of hybrid systems in locations where power reliability is critical. When diesel generator operating hours decrease, fuel consumption and emissions decrease accordingly. The test results — an 83 percent reduction in both fuel use and emissions — strongly support companies’ sustainability and environmental targets. Test Summary 83% less fuel 83% less CO₂ 83% fewer operating hours Easy to use and reliable Extends the lifespan of the diesel generator The BX e-Generator demonstrates how energy efficiency and practicality can work hand in hand. When power is produced intelligently, fuel, emissions, and time are saved. It is a concrete step toward more modern and sustainable jobsite power. More About BX e-generators
Airrex diesel heater – steady warmth and real savings
Good heating isn’t just about power. It’s also about cost efficiency – directing warmth exactly where it’s needed. Airrex diesel infrared heaters have proven in practice that consistent comfort doesn’t require high fuel consumption. The following examples show how Airrex heaters have helped keep heating costs in large industrial spaces under control – without compromising comfort. Proven results with infrared heating: only 2.5 litres per day Many are surprised to learn how little fuel Airrex diesel heaters actually consume. They’re designed to heat spaces effectively and evenly, 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 mineral wool insulation in the ceiling, plasterboard walls, and a concrete floor – a structure that stores heat efficiently. Previously, the warehouse was heated with direct electric heating, but switching to diesel brought a clear drop in both consumption and costs. Ström explains his experience: “At first, fuel consumption can be slightly higher. It usually takes about a week or a week and a half before it stabilises. Infrared heat is absorbed directly into the structures, and once they’re fully warmed, surprisingly little fuel is needed to maintain the temperature.” He keeps the warehouse at +15 °C when it’s around zero outside and has achieved remarkably low fuel consumption. Once the building is fully warm, daily consumption averages only about 2.5 litres of diesel. The Airrex heater has run reliably without problems and has required almost no maintenance. A slightly higher initial consumption is normal since building materials often contain moisture that must first dry out. Once dry, the system reaches its optimal efficiency. This is where Airrex infrared technology truly shines. The heat is stored within the structures and stays there. After that, only short heating cycles are needed to maintain a pleasant temperature day after day – and the savings show directly on the fuel bill. Smart thermostat keeps consumption low Every Airrex infrared heater comes with a built-in thermostat that helps minimise fuel consumption. The heater starts and stops automatically to maintain the desired temperature. Diesel is burned only when needed – and it’s metered precisely, no more than necessary, keeping consumption to a minimum. In practice, this means the heater works independently. Once the building’s structures have warmed up, the unit maintains the temperature with short operating intervals. There’s no need for constant adjustments – the thermostat does the work for you. Unlike traditional air-blowing heaters, Airrex units don’t push hot air to the ceiling or out the door when it’s opened. Infrared heat is directed straight into walls, floors, and machinery, which absorb and store it. As these structures retain heat, energy use remains exceptionally low. If a door is opened, the stored warmth quickly restores the indoor temperature. Long-term savings with Airrex diesel heaters Markku Ojanen has seen the difference first-hand. He heats a 1,080 m³ (360 m², 3 m high) insulated hall, which used to rely on radiators and fan heaters. The previous system consumed around 2,500 litres of oil per year. After installing an Airrex AH-300 diesel heater, the improvement was immediate. In the first winter alone, annual fuel use dropped to about 1,000 litres – less than half of the previous amount. He keeps the hall at a steady +9–10 °C, raising it to +13 °C while working. Over ten years of use, the savings have amounted to roughly €10,000–11,000, and the same heater continues to operate flawlessly. “Maintenance has been done on time, but no repairs have ever been needed,” Ojanen says. “It just keeps going.” Sustainable warmth you can feel Airrex infrared heating works on a simple yet powerful principle: instead of heating air, it radiates warmth directly into surrounding surfaces. Floors, walls, and objects absorb the heat – just like sunlight warms your skin. Once these surfaces are warm, they release heat evenly back into the air, maintaining a consistent indoor temperature. This stored warmth acts as a natural heat buffer, keeping fuel consumption low after the first weeks. The heater runs only as much as needed to maintain balance. That’s the key difference between infrared and traditional fan heaters. Infrared heat doesn’t escape when doors open or air circulates. The stored warmth in the structures quickly restores the temperature, keeping the heat where it’s needed and the savings ongoing. Site 1 – Warehouse Type: Warehouse 480 m³ Structure: Concrete floor, ceiling insulation, plasterboard walls Previous heating: Direct electric New solution: Airrex diesel infrared heater Maintained temperature: +15 °C in around 0 °C outdoor conditions Average daily fuel consumption: ~2.5 L diesel Maintenance: Reliable operation, almost no maintenance required Savings: Significantly lower consumption than 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 L oil/year New solution: Airrex AH-300 diesel heater Current fuel use: ~1,000 L/year Usage time: 10 years Estimated savings over 10 years: ~€10,000–11,000 Reliability: Same heater still running flawlessly, no repairs needed