What is the cost of installing a heat pump system for a new addition in Ottawa?

A heat pump is a popular way to heat and cool a new addition, either as a standalone system or alongside your existing equipment. The cost depends on the type of system, the size of the addition and whether you extend existing ductwork or install something separate.

As broad perspective, a heat pump system for an addition can range from roughly $5,500 to $14,000 depending on whether it is a single-zone ductless unit or a multi-zone system. Treat that as perspective, not a quote.

Ductless mini-splits are the most common choice for a single room or a smaller addition. They need no ductwork, provide heating and cooling, and give the addition its own controls. Larger additions such as a family room or in-law suite may use a multi-zone system with two or three indoor heads. If your existing forced-air system has spare capacity, extending the ductwork may be an option, though that only provides cooling if the house already has central air or a central heat pump.

Choose a cold-climate model. Winters regularly reach well below -20°C, and standard heat pumps lose capacity as it gets colder. Cold-climate models are designed to keep heating at low outdoor temperatures. Ask each installer for the published cold-weather capacity of the unit they propose and what backup heat the addition will have on the coldest nights.

Sizing comes from a heat-loss calculation, not a rule of thumb. A well-insulated addition needs a smaller unit, which costs less to buy and runs more efficiently. Oversizing wastes money and can reduce comfort. Under SB-12, an addition must meet a compliance package or the addition table, which includes an attic ceiling at R-60 and above-grade walls at R-19 plus R-5 continuous insulation. A better envelope means a smaller heat pump.

Rebates. The Canada Greener Homes Grant and Loan are closed, so don't count on that money. Ask your installer about any current programs, and confirm them yourself with the program before you sign.

Electrical. Most heat pumps need a dedicated circuit, and your panel capacity may need checking if the addition adds a lot of load. That work needs an ESA notification and is done by an ESA-licensed electrical contractor.

Ask for itemized quotes that list the equipment model, the indoor heads, line-set length, electrical work and warranty terms. You can browse HVAC and addition contractors in the Ottawa Construction Network directory at justynrookcontracting.com.

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