Yeah, the big torpedos are loud. I run mine while I’m out clearing the lot and I can hear it while I’m outside.
A 200k will heat up pretty much anything quickly. Figure your house furnace is in the area of 80k or so depending on how big your house is. So 200k for a garage will do it up. I run the 2-200’s at the shop and it keeps it above freezing. When it’s in the 20’s outside will get it up around 40 or so inside.