How much electricity does a heat pump use in winter?

Heat pumps are actually quite efficient with electricity in winter, though they do use more power than in summer cooling mode. A typical 3-ton heat pump in Ottawa draws about 3,000–5,000 watts (3–5 kW) when running, compared to a central AC which draws a similar amount but only in warmer months.

Understanding Heat Pump Efficiency

The key metric is the Coefficient of Performance (COP) — essentially how much heat you get per unit of electricity consumed. A modern cold-climate heat pump might have a COP of 2.5–3.5 at 0°C, meaning for every 1 kW of electricity used, you get 2.5–3.5 kW of heat. That's dramatically better than electric baseboard heating, which is always 1:1.

As temperatures drop, efficiency decreases. At –15°C to –20°C (common in Ottawa winters), a standard heat pump struggles and the backup electric resistance heat kicks in, which runs at 1:1 efficiency and draws 10–15 kW. This is why cold-climate heat pumps (like Mitsubishi Hyper-Heat or Bosch IDS) are strongly recommended for Ottawa — they maintain good efficiency down to –25°C or lower.

What This Means for Your Hydro Bill

A typical Ottawa home using a cold-climate heat pump as its primary heat source might add $100–$200/month to their electricity bill in January/February. However, this often replaces a significant gas bill, so the net cost comparison depends on current gas vs. hydro rates. Many Ottawa homeowners find heat pumps cost-neutral or slightly cheaper to operate than gas furnaces, while also providing summer cooling.

Ottawa-Specific Considerations

Ottawa's climate (Zone 6–7) makes equipment selection critical. Hydro Ottawa's time-of-use rates also matter — running your heat pump during off-peak hours (nights and weekends) can meaningfully reduce costs. The Canada Greener Homes Grant and Enbridge rebates can offset installation costs significantly, making the long-term economics even more attractive.

If you're weighing a heat pump against a gas furnace for your Ottawa home, we're happy to run through the numbers for your specific situation. Request a free consultation from Ottawa HVAC Pro to get a realistic picture of operating costs and upfront investment.