I'm building a dual-fermentor box so I can control the temp for two beers at once and I have the cooling part down I just need some advice on the warming part. I thought about the fish tank heater but I would rather not have water in this thing so I've been looking at heating mats and bulbs. The mats just seem safer to me but I'm not sure they'll be able to heat it up enough. If I have a pretty well insulated box hopefully any amount of heat will be enough. I basically need to heat it from about 50 to 70 degrees. Which is better?
http://www.amazon.com/dp/B0002AQCKA/?tag=skimlinks_replacement-20
http://www.amazon.com/dp/B0002AQCPK/?tag=skimlinks_replacement-20
http://www.amazon.com/dp/B0002AQCKA/?tag=skimlinks_replacement-20
http://www.amazon.com/dp/B0002AQCPK/?tag=skimlinks_replacement-20
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