I use two 1500 w fan heaters hooked up to high voltage thermostats* on separate breakers. They can keep the 8x12 double poly house at 60 no problem down to about 10 degrees outside.
When I used the heater's built in thermostat, I had to turn it up a bit higher than I thought would be necessary at early evening- it would run and cycle, but it would be cold by morning.
*High voltage= less wiring for me to mess with. I spent more on the thermostats than I did on the heaters- heater, $18 each; standard thermostat, $26; programmable thermostat, $50.
It costs about $2 + or - $.50 a day in the dead of winter.
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