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Réparation d’une thermopompe murale Midea à Sainte-Rose
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Repair of a Midea wall-mounted heat pump in Sainte-Rose

A typical service call in Laval: diagnosing a loss of efficiency in a Midea wall-mounted heat pump

At AirGreen , we regularly receive calls about wall-mounted heat pumps that appear to be working, but whose performance gradually declines. This is exactly what happened to a customer in the Sainte-Rose neighborhood of Laval . His Midea heat pump , installed for about five years, was no longer heating the rooms of the house sufficiently, despite the normal operating noise of the outdoor unit.

Diagnosis: Dirt buildup on the outdoor evaporator

Upon arrival, we noticed that the outdoor unit was attached to a gray wood siding, well exposed to the elements. This type of installation, while robust, is particularly prone to the accumulation of dust, pollen, and plant debris on the coils. Upon removing the protective grille, our technician observed a thick layer of dirt on the evaporator , severely limiting heat exchange.

Symptoms observed:

  • Blown air temperature lower than normal.

  • More frequent defrost cycle.

  • Slight overconsumption of electricity.

  • Constant but inefficient compressor noise.

These signs clearly indicated condenser fouling , a common cause of energy efficiency loss on Midea R-32 systems.

Steps of repair and preventive maintenance performed

Our technicians followed a complete system cleaning and upgrade procedure:

  1. Power supply cut off for safety.

  2. Removal of the casing and visual inspection of the outer coil.

  3. Gentle pressure cleaning with a biodegradable product specially designed for HVAC coils.

  4. Checked the R-32 refrigerant pressure , which was found to be correct.

  5. Cleaning the condensate drain and checking the fan.

  6. Complete reassembly and performance test on heating and air conditioning modes.

After just a few minutes of operation, the difference was obvious:
the discharge temperature became optimal again and the customer immediately noticed an improvement in interior comfort.

Result: restored performance and reassured customer

Thanks to this quick intervention, the Midea heat pump has regained its original performance. The electricity consumption has stabilized, and the indoor temperature has become uniform throughout the house. We also advised the customer to perform annual preventive maintenance , which is essential to avoid clogging and extend the life of the device.

AirGreen Recommendations:

  • Clean the coils at least once a year.

  • Check the interior filters every two months.

  • Avoid obstacles around the outdoor unit (plants, fences, etc.).

  • Schedule a complete inspection before winter for systems used for heating.

What this call illustrates

Every service call in Laval or elsewhere in the metropolitan area is unique, but the causes of failure often recur: lack of maintenance, clogged filters, dirty fan, or minor leak. At AirGreen, we make it a point to diagnose accurately , rather than simply replace parts. This is what allows us to guarantee sustainable, economical, and transparent HVAC service .

Why trust AirGreen for your wall-mounted heat pump repair?

  • Certified and trained technicians on all brands : Midea, Gree, Fujitsu, Sharp, Lennox, and more.

  • Rapid intervention in Montreal, Laval, Longueuil, North Shore and South Shore.

  • Professional diagnostic tools to detect performance losses.

  • Personalized advice to maximize the energy efficiency of your HVAC system.

In conclusion, this service call in Sainte-Rose demonstrates the importance of preventative maintenance. A well-maintained Midea wall-mounted heat pump can provide more than fifteen years of stable performance, provided it is carefully monitored. At AirGreen , we not only ensure immediate repairs , but also prevent future breakdowns —so your comfort is never compromised, no matter the season.