What COP rating should I look for in a heat pump?

A good heat pump for Ottawa's climate should have a COP (Coefficient of Performance) of at least 2.0 to 3.5 at typical operating temperatures, but the number you focus on matters as much as the number itself.

Understanding COP Ratings

COP measures how efficiently a heat pump converts electricity into heat — a COP of 3.0 means you get 3 units of heat for every 1 unit of electricity consumed. The catch is that COP isn't a fixed number; it drops as outdoor temperatures fall. A unit might advertise a COP of 4.0 at +8°C but deliver only 1.5 at -25°C. For Ottawa winters, that low-temperature performance is what really matters.

What to Look for in Ottawa's Climate

Ottawa regularly sees temperatures of -20°C to -30°C, so you should specifically ask for the COP rating at -15°C and -25°C, not just the peak rating. Look for cold climate heat pumps (sometimes called CCHPs or "hyper heat" models from brands like Mitsubishi, Bosch, or Daikin) that maintain a COP of 1.5 to 2.0 even at -25°C. A standard heat pump that shuts off at -15°C is simply not suitable as a primary heat source here.

HSPF2 Is Also Worth Knowing

Alongside COP, look at the HSPF2 rating (Heating Seasonal Performance Factor), which averages efficiency across a full heating season. For Ottawa, target an HSPF2 of 9.0 or higher. This gives you a more realistic picture of annual energy costs than a single-temperature COP snapshot.

Ottawa-Specific Context

Many Ottawa homeowners pair a cold climate heat pump with a gas furnace backup in a dual-fuel system, letting the furnace take over during the coldest snaps when heat pump efficiency drops. This is often the most cost-effective setup given Ottawa's climate. Rebates through Enbridge's Home Efficiency Rebate Plus and Canada Greener Homes programs can offset $2,000–$6,600 of installation costs, and higher-efficiency units typically qualify for larger rebates.

Next Steps

When getting quotes, ask contractors to show you the performance data sheet for any unit they recommend — specifically the heating capacity and COP at -25°C. If a contractor can't provide that data, that's a red flag. For a free consultation on which cold climate heat pump makes sense for your home, Ottawa HVAC Pro is happy to walk you through the options.