I have the same problem in my house, in winter it tends to be cold 68-70 degrees, so i went to petco and bought a twin lamp and n adjustable bracket that attaches to the backs of my tank, i use a white light for daytime and a red heat bulb for overnight and my tanks ambientnow stays at about 80 all the time. The bracket allows you to hang the lights above the tank and adjust the height of the lamps .
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