The garage has 8' walls. The foam between the purlins is about R5. When I was in it earlier this week, the heater was running about 15 minutes an hour with the outside temp at 19.
You have much better insulation so I would think your loss would be less than mine.
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I don't have the ProFusion but I have a Comfortzone. While its true the thermostat low end is around 40, turning the knob all the way down is off on the Comfortzone.
The Profusion and ComfortZone appear to be identical.
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Dkroth
Just to give you a little review, I just installed the 7500w version of that heater for my 24x32 pole barn. I spent the last week putting 1.5" foam between the purlins on the wall. I added R-13 and baffles between the rafters trusses next to the roof so that I could keep some light...