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I have a 30x40 shop and it is well built in that there are no holes or gaps. It is not insulated at all and no ceiling. Just the peak and you can see the ridge vent, so a lot escapes there. I have 2 of those heaters both 110,000 BTU. I have a inline 110 volt thermostat for them and it will get warm enough to work in a T shirt no matter what the outside temps are. You have to be carefull with carbon monoxide with these heaters. If I work in the shop all day Sat and Sun, Monday I will have a bad headache. 3-4 hours at night does not seem to bother me.
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