Well, I think AMBIENT air temps of 75 are ok, aren't they? As long as they have their hot spot when needed.

I don't think I could get my ambient temps up to 80 if I tried.

I've never seen an adjustable UTH myself, I bought a thermostat from Petco, a Zilla brand I believe, and with some minor fiddling, it works very well for me. O thnk it was around $40 ?

I also have the Accurite weather station from Wal-Mart, it works wonders for me.

Gale