Accurate diagnosis thanks to infrared measuring technology
During a service call in Sainte-Thérèse , our AirGreen team responded to a residential customer reporting a loss of performance from their Midea wall-mounted heat pump . According to the customer, the blown air temperature seemed less cold than usual, making summer days uncomfortable.
Our mission: to quickly identify the cause of the problem, restore optimal performance of the HVAC system and ensure lasting home comfort.
Initial inspection: abnormal blowing temperature
Using a professional infrared thermometer , our technicians immediately measured the air temperature at the outlet of the indoor unit. The reading showed 14.7°C , whereas for a wall-mounted heat pump in good condition, the temperature should be around 7 to 9°C in air conditioning mode.
This data confirmed an inefficiency of the refrigeration cycle , directing our diagnosis towards a possible leak of R410A refrigerant or a partial obstruction of the air flow .
Stages of diagnosis
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Complete visual inspection of the indoor unit and outdoor condenser;
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Checking refrigerant pressure using calibrated electronic pressure gauges;
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Control of air flow through filters and coils;
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Examination of the condensate drain and temperature sensor.
The results revealed significant fouling of the indoor evaporator combined with a refrigerant charge slightly below the standard . Both factors contributed to reduced cooling capacity and increased energy consumption.
Technical intervention: cleaning and recharging the system
Our team undertook a complete overhaul of the refrigeration circuit :
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Disassembly of the front casing of the indoor unit for a thorough cleaning of the evaporator with a non-corrosive product;
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Rinse and dry the condensate tray thoroughly to avoid unpleasant odors and blockage of the drain;
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Cleaning the outdoor condenser , whose fins were partially blocked by dust and pollen;
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Checking the circuit's tightness with an electronic leak detector ;
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Recharging the system with the exact amount of R410A according to Midea specifications;
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Verification of operating pressures and temperatures under actual load.
Final results and tests
After restarting, a new infrared measurement showed a blown air temperature of 6.8°C , indicating restored performance. The air flow , previously slowed down, had become smooth and stable again.
The customer immediately noticed the difference: cooler air, a rapidly decreasing interior temperature, and quiet operation. We also took the time to explain some good maintenance practices :
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Clean filters every 3 to 4 weeks during the warm season;
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Avoid obstructing the airflow around the outdoor unit;
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Schedule annual preventative maintenance to maintain energy performance and extend appliance life.
AirGreen expertise serving comfort on the North Shore
At AirGreen , we pride ourselves on combining technical rigor with modern diagnostic tools . Using an infrared thermometer like this allows us to accurately measure the performance of a heat pump without unnecessary disassembly, thus ensuring a quick and efficient intervention.
Our teams travel throughout Greater Montreal , including the North Shore, Laval, Longueuil, and the South Shore , to offer superior quality HVAC repair, maintenance, and installation services.
With extensive knowledge of brands such as Midea, Fujitsu, Gree, Goodman, Lennox and Sharp , we ensure reliable, durable interventions that meet the highest standards in the residential HVAC sector.