Ambient temps ?

[mattchibi]

hey guys
Im having a little trouble keeping up the ambient temps in my BP's tank.

right now the temps have been pretty consistent at:
92-93 F on the undertank heater
80 F on warm side temp at ground level
78 F on cooler side at ground level

Winter is coming where I live, so temps are dropping rapidly. I used to get 92 F on hot spot, 85 F on warm side and 80 F on cooler side no problem (a week ago).

Right now, I have a UTH setup under a hide (hot spot), and an infrared heat lamp above sort of in the middle to control ambient temps. I have this lamp on a dimmer, and Ive only been putting it to about 1/2 of its full brightness. I am afraid that if I crank it all the way up, it will cause the hot spot (where my snake chills all day) to be too hot.

Any suggestions as to how I can achieve warmer temperatures on both the cooler and warmer sides ? Currently I have a space heater in my room, but it doesnt work too efficiently and it only boosts the warm side to 80..