Heating stand-alone 1940s brick garage
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I have a 1940s detatched garage, 12’ x 20’ x 7’, outside of Boston. It’s 3 walls are 2 courses of brick with air gap, slab at grade floor, 4” concrete slab ceiling, 8’ x 8’ wood double carriage doors with large air gaps. 1 Harvey recent double hung window.
Just guesstimating that the whole structure is R-2 across doors, walls and ceiling, it’s likely 400btu/degree hour + leaky infiltration puts it at (least) 25k @ 70/9F.
Given I’d like to convert this to a workshop, keeping it at 50F throughout the winter and occasionally heat to 70 for work, curious peoples thoughts on heating it cost effectively. I can get away with a design temp more in the 20s as it’s unlikely I’d be working there on arctic days.
How bad is working with dust with a ductless head? I have a Fujitsu AOU24k with an extra port available for up to a 12k head, so that seems like the easiest way to heat it. The rest of the heads are off for the winter so it would be running in 1 head mode, but likely never turn off at those levels. Dehumidification in the summer might be nice to have.
Any other options if dust is a problem? I could work on better dust collection if it’s just a matter of cleaning the heads once or twice a year.
Resistance baseboard and just turn it on for the days I need it?
Appreciate anyone’s thoughts. Thanks!
Kevin
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