Bruce Ferguson said:

I will ask, what is a heat pump??? I understand furnace, wall heater,
fireplace and stove but don't know "heat pump"


Hey, Bruce,

Basically, it's a reverse air conditioner. Pulls heat from the
outside air and dumps it inside - and there is the rub. It doesn't
work in colder climates very well, 'cause there ain't no heat.

Most have a resistance heater as 'emergency backup heat'.
(A glowing red nichrome wire...)

FWIW,

Greg G.