11:06 PM
we used to have a heat pump (heat exchanger) when this house was built, but we replaced it with natural gas
the heat pump had electric heating coils as a backup in case the heat exchanger failed
where it heats up an element instead of sucking the warmth out of the outside air and bringing it in
we used that a couple times actually.. but it was expensive and fairly ineffective
you need something like 5 KW minimum to have an appreciable effect on whole house heating for our house when you're using centralized electric-based heating... so yeah... might've been even higher than that
I have a 750W space heater in my room, and it can't keep my room warm if the central heat is off