I'm certainly no expert, but a couple of things. First, you would have to worry about your propane tank and other equipment at 20F! The glass can always be pre-warmed in the kiln, but do expect a lot more cracking at any temp under 50F or so - at least for soft glass, not sure for boro.
Also I would hesitate to keep your propane inside the garage. Are you going to use tanked oxygen?
A space heater would be great but it might overwhelm your electric....I run a kiln on a dedicated circuit, and I couldn't even turn on a lamp without it all crashing. Ugh. I would advise that you just have the kiln on its own breaker.
You want more ventilation/make up air than the window you are venting out of, but there are others who can give advice on that. Search also in the archives, lots of info there. I work outside to avoid the whole issue. LOL. Good luck
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Kristin ~
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