An urgent call for two broken units
At AirGreen , we often receive service requests related to wall-mounted heat pump systems that no longer heat adequately in winter or stop cooling in summer. This is exactly what happened to this residential customer in La Prairie , on the South Shore of Montreal . His two Air Tempo outdoor units , installed side by side on the rear facade of his brick house, had been unresponsive for several days.
The call was recorded one March morning, when the temperature was hovering around zero. The customer noticed that his outdoor units were no longer starting , despite the indoor remote controls working properly. A typical situation of a communication problem or electrical overload in the control circuit.
On-site inspection and technical diagnosis
Upon our arrival, our technician carried out a systematic analysis of the two Air Tempo heat pumps :
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Checking the supply voltage : both compressors were receiving the correct voltage, which ruled out a power supply failure.
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Wiring and Connection Inspection : One of the control cables showed slight oxidation at the junction box , probably caused by moisture accumulated during the winter.
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Refrigeration circuit assessment : no refrigerant leaks were detected, pressures were normal once the system was manually restarted.
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Start Relay Test : One of the relays on the first unit was faulty , preventing the compressor from engaging.
Through this detailed inspection, we were able to isolate the main problem: a starter relay failure on the left unit and contact oxidation on the right unit, two relatively common problems after several freeze/thaw cycles.
Repair and recommissioning of the two heat pumps
Our team carried out the necessary corrections on site to completely rehabilitate the client's HVAC system :
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Replacement of the starter relay on the first Air Tempo unit, using a certified original part.
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Cleaning and resealing the electrical connection box using a moisture-protecting compound.
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Checking condensation drains to prevent water from accumulating under the units.
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Complete communication test between indoor and outdoor units , confirming a return to normal.
Once everything was turned back on, both heat pumps immediately resumed their quiet and efficient operation. We checked the pressures, blower temperatures, and fan speeds to ensure optimal performance.
Results and customer satisfaction
The client immediately regained comfort , both in terms of heating and air conditioning. His two Air Tempo heat pumps operated in sync, with excellent energy efficiency. We also provided him with some maintenance tips to extend the life of the system:
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Clean the internal filters every two months, especially during periods of heavy use.
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Clear snow and debris around outdoor units during the winter.
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Have the system inspected annually by an AirGreen technician to detect early signs of electrical or mechanical wear.
The special features of Air Tempo systems
Air Tempo heat pumps are known for their reliability and efficiency, but like any HVAC system, they require regular preventative maintenance . Electronic components, such as relays and control boards, are sensitive to humidity and extreme temperature cycles—a common occurrence in Greater Montreal 's climates.
Our technicians are trained to work on all Air Tempo systems, whether for repairs, preventive maintenance or replacements . Thanks to our parts inventory and our expertise, we ensure fast and lasting repairs in all regions: Montreal, Laval, Longueuil, the North Shore and the South Shore .
AirGreen: Your Trusted HVAC Repair Partner in La Prairie
This project perfectly illustrates AirGreen's philosophy: respond quickly, diagnose accurately and repair efficiently . Our priority is always to restore home comfort while ensuring the energy performance of the equipment.
Whether it is for an Air Tempo heat pump , a Fujitsu , Gree , Midea , or Sharp unit, our teams provide a professional and personalized service, adapted to the needs of each client.
In La Prairie, as elsewhere in the metropolitan region, using AirGreen means investing in reliability, security and peace of mind .