I personally dont like using heating devices not made for reptile use...
i've never used a human heating pad and probably never will for my repttiles.
Except for keeping my toes warm in the winter months while sleeping...lol
But other then that, i like to play it "safe".
Thats not to say it wont work, but i would hate to have something go wrong and have a human heating pad to blame.
If you DO Decide to go with a under tank heater.... i have had good success with the Hagen/exoterra heat pads.
Ive had them running for years with no problem and they are removable as i dont peel the sheet covering the sticky end.
Heat tapes good too as Mykee mentioned and its very affordable.
But with your situation by the sounds of it, the safest method would be over head heating.
Either purchase some heat panels or wire some lights in.
Goodluck!
gvg
__________________
Grant van Gameren
|