As soon as it hits below 65 I'm sitting in the garage.
And as soon as it hits below 50 I'm turning on my tank top dual propane heater, though I mostly just use one burner, and that one on low or medium and I just crack the door a bit. Haven't passed out yet.
But the propane heater is awesome, so much better than my electric (which I ended up giving away) and a tank usually lasts me about two months. I have a small propane radiant heater that uses the small bottles, but the bottles just don't last that long, maybe two nights. But it's nice for emergencies or just a tad extra heat on my feet.
As for the smell in the garage, I don't care, it can smell away. The wife actually suggested I just smoke in the house, but I think that's cause she doesn't want me holed away in the garage the whole day.
But I refuse to smoke in the house, I don't want the smell in there.