Heat Pump Repair in Terrebonne: What Fails on the Systems in a City Built Since 2000

What fails on a subdivision heat pump

A central heat pump in a Terrebonne house has an outdoor unit, an indoor coil on top of an electric furnace or air handler, and a thermostat that decides when the electric backup runs. It fails at the defrost cycle, which ices up in the freezing rain the north shore gets and leaves the outdoor unit a block of ice; at the sensors and control board; at the reversing valve that switches heating to cooling; at the compressor after fifteen to twenty years; and at the refrigerant, which leaks at the flare fittings. A wall-mounted unit fails at the same places on a smaller scale, and stops producing useful heat in deep cold by design.

The electric backup hides many failures: a heat pump that has quietly died leaves the house warm and the Hydro-Québec bill doubled. A bill jump in January is a reason to book a service call.

Check before booking

Check the breakers for the outdoor unit and the air handler, the filter, the thermostat mode and setpoint, and the outdoor unit for ice; a unit with a light frost that clears in a defrost cycle is normal, a block of ice that stays is not. Pour warm water on a lightly iced coil if you must, never chip it. Check the condensate line at the air handler for ice or a blockage. Then note the model, the age and any code on the thermostat or the indoor unit. A service call for a heat pump in January is a bad time to learn the unit has a refrigerant the technician cannot get; ask on the phone.

• Breakers for the outdoor unit and the air handler
• Filter and thermostat mode
• Ice on the outdoor unit: frost that clears, or a block that stays
• Condensate line clear
• Model, age and refrigerant type

Who may do the work in Quebec

Quebec requires anyone doing construction work for hire to hold a licence from the Régie du bâtiment du Québec in the relevant subcategory; heat pump and refrigeration work needs the refrigeration subcategory and technicians certified to handle refrigerants under federal rules. The RBQ’s public register shows the licence and any restrictions. Electrical work on the circuits and any service upgrade must be done by a CMEQ master electrician, and Hydro-Québec coordinates the upgrade. Quebec’s Consumer Protection Act gives a ten-day cancellation right on contracts made by an itinerant merchant, which covers most door-to-door heat pump sales, a common tactic on the north shore.

Repair, replace and the rebates

Compare the written repair quote with a replacement quote that includes the current Hydro-Québec and provincial rebates, which have favoured cold-climate models with a stated capacity at minus 20 and a proper backup; the terms change each year, so get the figures in writing. A compressor or a refrigerant conversion on a unit past fifteen years is usually the wrong bet. A replacement should be sized by a heat-loss calculation, not by matching the old unit, and the quote should state the balance point, the temperature below which the backup carries the house. Ask whether the electric backup and the panel can carry the new unit; the first generation of subdivisions often has 100-amp panels already full.