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Heating
Heat pumps, furnaces, boilers and dual-fuel systems: how they work and what they cost to run.
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Explainer
How do I set the switchover temperature on a dual-fuel system?
A heat pump with a gas furnace backup should switch at the colder of two temperatures: where it stops keeping up, and where it stops being the cheaper heat.
3 min read
Explainer
What does "aux heat" mean on a heat pump thermostat?
Aux heat is the backup that switches on when the heat pump alone cannot keep up. Why it appears, what it costs, and when it points to a problem.
3 min read