What I use is a heat mat of the kind designed to sit under a terrarium - mine is 16W - and a heat mat controller, which incorporates a thermostat. I tape the mat to an inside wall of a picnic cooler and tape the sensor to the the other wall. Total cost excluding the cooler was $50 CAD. Cheapen that by using a low-wattage light bulb that you already have - the controller is designed for any 120V load. The charm of this solution is that I get a climate-controlled environment that stays within a 2F range with no fussing about. The ugly is that it cost $50 CAD and ties up my cooler. Homemade proofing chamber (without humidity control). I'd be interested in finding a solution that moderately chills a small space, but I'm unaware of a cheap technology for a "chill mat." Anybody?

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