Hi Apple2. Obligatory question first: Do you have a thermostat/dimmer attached to the UTH? If so, you should be able to regulate the heat fairly easily. Disposing of the lamp will help, too. Move the tank as far from the window as you can and adjust temps as needed, although a thermostat should do a decent job of keeping temps steady. My room gets kind of chilly with the AC on, and I'm fanatic about checking temps (I don't depend on the thermostat's reading by itself).
Also, you can wrap a blanket around the tank to help keep heat in. Keep in mind though that unregulated, UTH's, especially the size for a 30 gallon tank, can get really hot unregulated. I experimented once and I think it hit 120 at one point.
Let us know how things go and don't be afraid to ask more questions. Hope I helped.
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