Hey everyone,
I'm trying to spec a heating system for a 400 sqft uninsulated garage. It is an old construction with 1/2" boarded walls with shingles and 24" on center true 2x4s. I don't know how many air changes we get right now, but it's gotta be frequent.
In comparing adding insulation (DIY install) to continuing uninsulated, I'd be aiming for a 2 year break even. My location sees 7400 degree days.
Also trying to figure out what heating system to use. Space is a concern. If it's electric I'll have to figure about $300 for a sub-panel install with 240v 60A circuit.
I'd like to maintain an above freezing temperature 24/7 with a 30 minute time to heat the space to 60 degrees.
My first inclination is to go radiant only propane and skip the insulation. But I haven't touched these calcs in forever and was hoping for some thoughts and guidance before I dive in.
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