Comfort compromised by clogged filters: rapid diagnosis and lasting solution
At AirGreen , we are often called out for reduced efficiency issues on wall-mounted heat pumps . One recent case took place in Saint-Constant , on the South Shore of Montreal , where a customer noticed that his Midea unit was no longer cooling his rooms efficiently despite continuous operation.
Upon our arrival, a quick glance at the wall-mounted unit provided an initial visual diagnosis: the air filters were heavily clogged with dust and fine particles, restricting airflow and forcing the compressor to run non-stop. A seemingly simple problem, but one with potentially costly consequences if not addressed quickly.
Complete inspection and in-depth diagnosis
Our certified technician first cut off the power to the heat pump to perform a safe and methodical inspection .
Here are the main steps followed:
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Open the top hood and check the air filters.
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Inspection of the evaporator coil , where a dense dust accumulation had begun to form.
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Checking the condensate drain , often blocked when the filters are neglected.
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Check the sensors and thermistor probe to ensure they are not experiencing false temperature readings.
The diagnosis confirmed that clogged filters and indoor coil were severely restricting airflow and forcing the system to compensate by increasing fan speed and discharge pressure—a situation that could lead to compressor overheating in the medium term.
Professional cleaning and restoration
Our team undertook a complete cleaning of the unit, step by step:
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Remove the air filters for cleaning with warm water and a light detergent.
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Applying a specialized biodegradable cleaner to the evaporator coil to dissolve embedded dirt.
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Cleaning the fan housing (impeller) , often neglected, but essential for balanced airflow.
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Disinfection of the collection tray and condensate drain to eliminate mold and bacteria.
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Replacing the perfectly dry filters and completely testing the system.
After just a few minutes of operation, performance measurements showed a supply air temperature 6°C cooler than before the intervention, indicating an immediate return to normal efficiency.
Results: comfort restored and efficiency regained
At the end of the intervention, the client was able to see a clear difference:
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The airflow was again strong and even .
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The noise level of the indoor unit was reduced thanks to the clean and balanced fan.
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Power consumption dropped significantly, since the compressor no longer had to compensate for the lack of air circulation.
Our technicians also took the time to reprogram the Midea heat pump's automatic cleaning cycle and recommended seasonal maintenance to prevent the situation from recurring.
AirGreen Tips: Maintenance, an essential reflex
Wall-mounted heat pump filters should be cleaned every 4 to 6 weeks during active cooling or heating periods.
A simple oversight can lead to:
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A loss of energy efficiency of 15 to 30%.
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Premature wear of the compressor.
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Bad odors due to stagnant moisture in the coils.
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An increase in electricity consumption .
At AirGreen, we offer preventative maintenance agreements that ensure the proper functioning of your HVAC units throughout the year. We use certified, residue-free products to ensure healthy indoor air and optimal performance.
AirGreen Expertise: Much More Than Just Cleaning
This type of intervention demonstrates the importance of maintenance carried out by qualified technicians . Many owners are satisfied with a superficial cleaning of the filters, but the interior of the heat pump—particularly the coil and the fan—requires technical attention .
Our specialists have the tools and know-how to:
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Diagnose performance losses before they become failures.
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Use the correct products and pressures to avoid damaging the coil fins.
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Check the electrical connections, probes and electronic cards.
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Offer personalized recommendations based on each customer's model and usage.
Each AirGreen intervention concludes with a complete performance test and a documented maintenance report , ensuring traceability and compliance of the service.
Conclusion: efficiency restored and customer satisfied
This service in Saint-Constant perfectly illustrates the AirGreen philosophy:
fast, precise and long-lasting interventions . Thanks to professional maintenance, the customer's Midea heat pump is now operating at full efficiency, ensuring constant comfort and controlled energy consumption .
Whether you are in Montreal, Laval, Longueuil, on the North Shore or the South Shore , our teams are available for any repair or maintenance of wall-mounted heat pumps .
At AirGreen, your comfort and the reliability of your HVAC system are our priority .