Elvis Costello and I have been looking at this year’s models in air-source heat pumps; alas, for me, it is time for a new furnace. So, I am looking at the latest tech and craze in efficient home heating and cooling.
Have you ever wondered how a heat pump can pull warmth out of chilly winter air? It sounds impossible, but here’s the simple secret:
Unless the air is at absolute zero (–273 °C), it still contains small amounts of heat energy. Even on a frosty day, there’s technically warmth in the air. A heat pump is unable to work anywhere near absolute zero but modern cold-climate models can function at –15 °C to –25 °C.
- A heat pump uses a refrigerant to “soak up” or move that energy from outside.
- Then, through compression, it boosts the temperature and delivers that heat indoors.
Think of it like espresso: a small scoop of grounds becomes strong once it’s concentrated. A heat pump works the same way with cold air — concentrating hidden heat until it’s warm enough to fill your home.
A heat pump doesn’t create heat by burning fuel. Instead, it moves existing heatfrom outside into your home. Because of this, the system can transfer 2 to 3 times more heat energy than the electricity it consumes. So, if it uses 1 unit of electricity, you might get 2–3 units of heat indoors.
Think of a furnace as buying a dollar of fuel and getting back 95 cents in heat. A heat pump is more like paying a dollar and getting two or three dollars’ worth of heat — because it’s not creating heat, it’s just moving it efficiently.
And the bonus: in the summer months, the process reverses. The heat pump pulls heat from your indoor air and releases it outside, keeping your home cool and comfortable — essentially acting as an air conditioner. It can pay for itself in five to ten years in Toronto.
That’s why more homeowners are turning to heat pumps combined with high-efficiency furnaces — they’re efficient, eco-friendly, and add comfort and value to your property year-round, hence the attraction.