Best way to heat that with one source is a 80 or 88 watt RHP from Pro Products or RBI. Those are around $100 shipped. Then you need a Tstat unless you already have one. This Will eliminate having to use a UTH, heat lamps or ceramic heat emitters. 1 trick does it all. You'll know what wattage to get by how cold your house gets at night during the winter. If your house is 68 minimum at night a 80/88 watt would do it..
http://pro-products.com/pro-heat/
http://www.reptilebasics.com/rbi-radiant-heat-panels
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