This 47 Barn gets a bit chilly during the cooler months.
I live above my shop, 30x30, the upstairs is 2bd/1ba.
I burn wood during the day, which maintains a decent temperature up and down, but at night it gets a bit chilly toward dawn.
I set the Vevor up on my screened in porch, then punch a hole in the steel door going to the living space upstairs, using 3" double wall exhaust pipe for the heat transfer.
30x30=900sf, this little thing will heat me out if I let it.
Loven it.