I'm not a big fan of overhead heat lamps for snakes. Boas are low light level nocturns in nature, for the most part. They have no eyelids. Bright light isn't requited or desired.
Those lamps tend to lower the humidity. It's my belief too low humidity is is a primary cause of RI in Boas.
Use the subfloor heat. Think about it. Snakes don't go out on the road at night to get sun, they go on the road at night to absorb retained heat from the pavement through their belly. The air temp can at times can be much lower.
Here's another suggestion: Get a tub (buss tub, cat litter pan)as large as the cage will allow, within reason. Place a submersible aquarium heater in the water filled tub. Allow enough freeboard for displacement, should the snake choose to get in, of coarse. Set the heater thermostat at 99 deg. F. I have added an aquaruim air pump with an air stone for circulation and atmospheric dispersal.



Photo of example. Submersible circulating pump is black box. Heater is not seen. Airline to airstone is seen. Airstone is not.

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• Panic - big female has an RI - Conners, Sat Nov 10 05:08:40 2007
• RE: Panic - big female has an RI - jscrick, Sat Nov 10 08:18:45 2007
• RE: Panic - big female has an RI - Conners, Sun Nov 11 04:11:07 2007
• RE: Panic - big female has an RI - jscrick, Sun Nov 11 10:27:53 2007
• RE: Panic - big female has an RI - Conners, Sun Nov 11 12:53:20 2007
• RE: Panic - big female has an RI - bergmantis, Sat Nov 10 15:13:14 2007
• RE: Panic - big female has an RI - Conners, Sun Nov 11 04:12:47 2007
• RE: Panic - big female has an RI - Conners, Thu Nov 15 16:22:44 2007