Wall-mounted and central heat pumps are a popular energy solution across the Greater Montreal Area, including Laval, Longueuil, the North Shore, and the South Shore. But sometimes, a unit just doesn’t heat like it used to. Whether it’s a slight discomfort or a noticeable drop in performance, this raises a crucial question: why isn’t your heat pump delivering the same warmth as before? And more importantly, how can you fix it quickly and effectively?
At AirGreen, we’ve handled hundreds of similar cases throughout metropolitan Quebec. Thanks to our technical expertise, tailored approach, and real-world experience, we’ve compiled the main possible causes here—along with practical solutions we implement every day.
The most common reasons for reduced heating performance
1. Lack of regular maintenance
Dust buildup, pet hair, or pollen inside the filter, indoor unit, or outdoor unit can block airflow and significantly reduce performance. In Montreal, we recently performed a full cleaning on a Gree Lomo heat pump in Rosemont, where the unit was clogged with years of debris. A simple HVAC maintenance service immediately restored steady heating throughout the home.
2. Undersized system or poor installation
Sometimes, the problem isn’t wear and tear—it’s a poorly sized unit or a sloppy installation. For example, a customer in Sainte-Julie on the South Shore contacted us after having a heat pump installed by another company. The 12,000 BTU model wasn’t powerful enough to heat his 1,500 sq. ft. home. We replaced it with an appropriately sized Fujitsu KZAH 18,000 BTU, tailored to his actual needs and space. Since then, comfort has been consistent.
3. Faulty temperature sensor or thermostat
Malfunctioning temperature sensors or miscalibrated thermostats can send incorrect information to the unit. The result? The heat pump shuts off prematurely or doesn’t reach the desired temperature. Our certified technicians test these components during every HVAC maintenance visit in the Greater Montreal Area to ensure optimal regulation.
4. Weak compressor or low refrigerant
Over time, the compressor can weaken, or micro-leaks in the refrigerant line can develop—especially in systems older than 8 years. We recently intervened in Laval on a Goodman R-32 central heat pump installed in 2015. The compressor was making odd noises, and the heating performance had dropped. After a pressure test, we located a leak in the system. We repaired it, recharged the refrigerant, and the system was back to full capacity.
Common user mistakes to avoid
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Using AUTO mode: this mode switches between heating and cooling automatically, sometimes causing unexpected shutoffs. In winter, always select HEAT mode only.
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Ignoring alerts or error codes: blinking lights or codes on your remote should never be ignored.
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Blocking the outdoor unit with furniture, snow, or fallen leaves: this prevents the unit from releasing cold air and seriously reduces efficiency.
AirGreen’s practical solutions
A full on-site diagnosis
At AirGreen, we never offer one-size-fits-all solutions. When a client calls us because their heat pump isn’t heating properly, we always begin with a complete system inspection. In Longueuil, we recently diagnosed a wiring issue that was preventing the compressor from starting. Our certified team resolved it in under two hours.
Annual maintenance: a must
We recommend professional cleaning at least once a year, which includes:
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Cleaning both the indoor and outdoor units
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High-pressure coil washing
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Refrigerant level check
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Sensor and thermostat inspection
We recently performed this service for a homeowner in Boisbriand on the North Shore, whose Bosch BIVA IDS Premium R-454B heat pump was showing temperature inconsistencies. After a thorough maintenance, full performance was restored.
Adjusting or replacing components
If a fan motor, sensor, or control board is defective, we stock all replacement parts for major brands including Fujitsu, Gree, Goodman, Bosch, Tosot, Lennox, Arcoaire, and others.
We recently replaced a Fujitsu control board in Saint-Lambert that was preventing the unit from switching to heating mode. The repair was completed the same day.
Personalized advice for better efficiency
We don’t just repair—we educate our clients to use their systems better: ideal temperature settings, how to clean filters, smart programming, and more.
The AirGreen approach: precision, transparency, and local service
We operate exclusively in the Greater Montreal Area, and our reputation is built on quality service, deep HVAC expertise, and our understanding of Quebec’s climate.
Whether you're in Verdun, Repentigny, Brossard, or Laval, our mobile teams are ready to repair, maintain, or upgrade your heat pump efficiently and professionally.
Key takeaways
If your heat pump isn’t heating like it used to, don’t panic. It might be due to a lack of maintenance, an incorrect setting, or a part that needs replacing. What you need is a professional, fast, and transparent assessment.
At AirGreen, we do everything necessary to restore your system’s comfort, performance, and energy efficiency, all year round.
Call us today to schedule a system inspection or professional maintenance. Let’s get your heat pump back to optimal performance—together.