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Check at places like Home Depot etc. They have devices that you can plug in and then plug heat tape, heat lamp etc into. When temp drops to 35 they come on and then when it warms to a point I dont know it goes off. or like I do I just set things on timers (cause I have lots of timers).
Timers are great. I have one for my layer coop. I can set 2 different times with it. It comes on and adds a few hours of light in the AM, is off all day then comes on in the pm for a while. Found this one on clearance at Home Depot.
For my greenhouse, I prefer the temperature control. No point in heating it if the the temps don't require it. All I'm trying to do is keep it above freezing.