Most cost effective way to heat a BP cage?

[Lord Sorril]

Hi what's the least expensive way of heating a cage with overhead heat? I don't use tubs.
At the moment I am using a CHE and a Jungle Dawn LED.
And recently I am thinking about getting another snake maybe but I am not sure if I can afford it. With prices so high and the economic situation right now, you know.

I know a lot of people in colder climates will use foam board to insulate the three sides of a glass enclosure, others will keep their enclosures in closets to contain the heat and minimize the output required to sustain temps.

Electricity is the highest overhead expenditure I have for keeping my snakes. One electric company in my area owns the power lines, and regardless which electric company I use my 'distribution fees' make the cost among the highest in the continental United States.

Side story: My electric company sends me flyers about how to 'conserve energy', which makes me feel guilty (almost). Of course that was until I was talking to my director last week (who has the same power company) and he said his electric bill averaged between $2100-2700/Month. An olympic-sized in-ground outdoor swimming pool heated to 91F six months out of the year in Massachusetts....cha-ching! My director also boasted that his wife spends $8K/year on flowers for their gardens...I was thinking the other day how that seems unlikely...but, then I went to a greenhouse and saw prices got a bit steep as of late...