Well at the moment ive got decently efficient window unit that i use 8000 btu. It does good for where i stay. I dont heat and cool the whole house because of the money it cost. I am heating with just a space heater. Radiator heater. Ran a Kil o watt meter and divided the time it ran 650 watts a hour what its usin at 68 and 70. Figured if a heat pump is more efficient have the cop of 3 . Wouldnt that mean rough estimate 215 to heat the same ? There for i could heat 3 more rooms the same size for the price im heating only 1 3 more rooms would be almost the whole part we go through durin the day. .
Or am i just way off on the figures.
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