Personally, I went with one of these - http://www.reptilebasics.com/thermos...stat-prewired/ - and one of these - http://www.amazon.com/DeLonghi-TRH07...ywords=trh0715 - to keep the temperatures up when the weather starts to cool.

There are a bunch of other solutions, but I went with this one so I can control the entire snake room's temperature rather than each enclosure individually.