What is the switchover temperature for a hybrid system?

The switchover temperature for a hybrid heat pump/furnace system is typically set between -5°C and -10°C for Ottawa's climate, though the optimal point depends on your specific equipment and current energy prices.

A hybrid system (also called a dual-fuel system) pairs an electric heat pump with a gas furnace as a backup. The balance point or switchover temperature is the outdoor temperature at which it becomes more cost-effective or efficient to run the gas furnace instead of the heat pump. Above that temperature, the heat pump handles heating. Below it, the furnace takes over.

In Ottawa's climate, this setting matters a lot. Our winters regularly dip to -20°C to -30°C, which is well beyond the efficient operating range of standard heat pumps. However, cold climate heat pumps (like Mitsubishi Hyper Heat or Bosch IDS) can operate efficiently down to -25°C or lower, which pushes the switchover point significantly lower and maximizes your savings on electricity versus gas.

The ideal switchover point is a calculation, not a fixed number. Your HVAC technician should factor in your heat pump's efficiency curve (COP at various temperatures), current natural gas prices from Enbridge, and your local hydro rates from Hydro Ottawa. As energy prices shift, the optimal balance point can change — some modern smart thermostats like the Ecobee can even adjust this dynamically.

For Ottawa homeowners, a common starting point is around -8°C to -10°C for a standard heat pump, or as low as -15°C to -20°C for a cold climate model. Your HVAC technician should commission the system and program this setting during installation.

If you're installing a new hybrid system or want your existing balance point reviewed, Ottawa HVAC Pro can assess your specific equipment and energy costs to dial in the optimal switchover temperature — feel free to request a consultation.