Technologies like hydronic slab heating, air-to-air heat pumps, even good old-fashioned oil-filled radiators all have numbers attached to them, and knowing those numbers is a good starting point for choosing a heating system.
Calculating which electrical home heating technology is right for you is, like many calculations, all in the numbers.Knowing how some of those numbers interact with the temperature outside won’t hurt either.Any “resistive” heater that works by running electricity through a conductor such as a wire starts with this number as the base measure of its energy efficiency.
The most common way to get there is with an “air-to-air heat pump”, which, because of Australia’s hot climate, is usually sold as a “reverse cycle air-conditioner”, focusing on its easier-to-sell cooling capabilities and breezing over the fact that it’s also an energy-efficient heater.Heat pumps don’t create heat directly from electricity the way resistive heaters do.
Because of the way they can slow their gas compressors when your house has reached its desired temperature, that number can even be as high as 6.0 in practice, says Wright.
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