I know what you mean about the weather! Brrrr, it's like 65 when I get home but when I pull the z in the garage it pretty much warms it up to 70 with just the heat of the engine and exhaust after I turn it off of course. And it gets dark so early, I have to turn the lights on at like 5:30 and it's dark by 6:30, well dark in a comparitive sence it's not like you need a flashlight to walk the dog in the city at night anyway.
Seriously, 4 below what??? I think the coldest I ever was here was 40. Although there is frost on the cars in the morning. so it must get colder at least on the cars, but you could walk out without a jacket, it's not like 32 in the air for sure.
Big project, I hope you stay at it!