Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
My friends at Kerusso in Arkansas use restaurant heat lamps to warm up the white inks pre production and keep them warm throughout harsh winter days (not overnight!)
It's at 50 degrees all night back there. We use one stroke, no one has complained about it being too stiff or hard to use. Maybe just keeping off the floor is all ya need.
I'm really not trying to be a smart ass here. What is the cost of turning up (programming) the thermostat enough to make a difference? Compared to the time you have to eff around getting things going and making money?