Originally Posted by orfy
How about putting it in a water bath(insulated) and using an aquarium heater?
I like that idea a lot, but it is a "crawl" space. I have a hard enough time moving the fermenter in and out of there, not sure if I could move it with a tub full of water too. In the future I think I'll build a small insulated area and use a light bulb to generate some heat. I've also thought about getting a cheap heating pad and setting the fermenter on it. I'm way too cheap to invest in a freezer and controller and I really don't need the cooling power of a freezer. Even in the summer it's rare if the temp gets above 80, so I pretty much need to add heat. I fermented my first few batches in the guest bathroom, but that was only a temporary solution. SWMBO is okay with that while I'm learning, but really wants something a little more permanent and I thought the crawl space would work. There's also a shed I could setup in, but that would need to be insulated and have some sort of heat source.
Anyway, I got the wort warmed up to 50 last night, wrapped it nice and warm, and put it back in the crawl space. It's at 46 now and bubbling away nicely. The outside temp warmed up today too so I think I'll be okay. As someone else said, it'll just take longer to ferment. Thanks to everyone for the advice.