I myself never turn the heat off, down but not off. Basements have a tendency to stay relativly the same temp up here. Weather its -30 outside or a 115 the basements tend to stay in the 60' range. A lot of it is do to the geo-thermal properties of the soil composition and that the concrete is in said soil, acts like a big heat sink.
All my cages run suppelmental heat and I just heat the room to 80', I have 2 rooms thats why I have two heaters.
My wife doesn't like the electric bill either but its something she deals with. I don't like the girly stuff in the bathroom but I deal with it, comprimise.
Take her to dinner and dancing, romance her all night than show her the bill. I think it will be fine, it is for the life of your herps and all.
Good Luck
-----
Jeremy
"I am become death, the destroyer of worlds" July 16, 1945 Robert Oppenheimer
1.1 Double Het "Sharp" Snow RTB's
1.1 Hypomelenistic RTB's
0.2 Pastel Hypo RTB's
2.0 Double Het Stripe Albino RTB's
0.1 Suriname RTB
0.1 Anerthrystic RTB
0.0.11 Red Bearded Dragons
1.1 Rhinoceros Iguana's
1.0 Green Iguana
1.0 Ball Python
1.1 Cream Golden Retrieviers
1.0 Pomeriaian
0.2 Catus Terribilis
0.1 Spouse
0.0.1 Youth -coming soon-