Originally Posted by gljurczyk
I checked into adding just a strip heat 5 kw. They make a kit to do it pretty easy except you have to add another stat wire. Then only thing I think a person can do is either tie on to one end and pull new wire or use the either the high or low wire from the a/c so you don't have to pull new wire could be a big problem if stapled trying to pull new. I never use the high blower setting it's to noisy but still have it on my list to do so I could use that. Just a Thought........
5kw? How much amp draw? A true 5 kw will draw 41 amps at 120 volts - well above the typical 30 amps service before you even account for the heat pump compressor running. You obviously meant 5000 btu which will draw about 13 amps. Add the amps of the compressor (14+) and you are at borderline of 30 amp service without room for the power converter to maintain the 12 volt stuff.
With power it's all about volts and amps. At 120 volt you have roughly 22 - 24 amps of reserve (you have the fixed draw range of the converter).
Run the electric element on the water heater (12 amps), electric for the refrigerator (5-5 amps), microwave (9 amps) you have to trade-off electric loads to keep from tripping the 30 amp breaker.
As for the question on the heat pump operation; don't think of it as heat
like from your furnace. It is sufficient for heating when temps are 50 - 60 degrees with moderate humidity range. If humidity is higher the heat pump won't heat enough for creature comfort although it will raise the temperature.
Experiment with it - maybe even try supplementing with a space heater (although it too adds to the electrical load).