Hi,
The heat pump cost is in-significant, but it can put out more than double the Btu's of a space heater. Nearly 15,000 Btu's while at 57F outside temps, from a unit rated to cool at 13,500 Btu's. This is because it is actually cooling the outside air at about 13,500 BtuH, and the heat from the compressor motor is added to the freon, to give a total heat capacity a little greater than the cool rating in the summer time.
For reference, a space heater is about 5,200 Btu's per hour while on the 1,500 watt setting. They are kept just below 12.5 amps to keep them from tripping a 15 amp circuit breaker.
If you find that your new home will have a place to plug in the TH, and you will be heating it with your own power, you will like only using 1/3 the power with a heat pump compared to a electric heater.
To provide 80,000 Btu's of heating, you need to burn 1 gallon of propane, or 22 KW of electric or run a heat pump that will use about 5.5 KW to 8 KW, more power on a cooler day than on a warmer one. So the heat pump will use about 1/3 the power of a electric resistance heater.
Fred.