You can buy stronger heat lamps. There are ceramic heat emitters that are 150 watts. However, a UTH would be better. You use a thermostat by plugging the UTH or other heat source (or both) into it and programming the temps you want into it, then it maintains the temps for you. There are reptile thermostats.
On another thread, Mykee said this:
Quote:
Check out Spyder Robotics Herpstat
The Herpstats are the standard for reptile thermostats with a few different options for different set-ups. I currently have a pair of Herpstat II's and five Herpstat Pro's in use.
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The Herpstats are pretty expensive, though. If you want something less expensive, ZooMed makes thermostats that work well for a single enclosure:
Entry Detail
Search around for prices at various places. Good luck!
BTW, I should add that if the window feels cooler at all to your hand, then it's probably a bigger difference than you think and it's sucking heat from your snake's enclosure. To be sure, you could put a thermometer in the window. The insulation should help some, but as the ambient temp in the room is lower than the enclosure and you have one glass wall with no insulation, you're still always losing heat. Getting a UTH & maybe also a stronger lamp with a thermostat should help a lot.