The oil heater does really well (there is also an oscillating fan that constantly moves the air around). I have a small electric heater that is set to come on if the temp drops below 54 degrees (it's only had to come on once or twice).
I bought a remote temperature monitor with an alarm that I keep in the house - it's set to go off if the greenhouse drops below 51 degrees. If the temp gets that low then I run out and turn on the propane heater (useful for power outages - again, something I haven't had to deal with . . . yet.)
Yup, same page (broke!)
