What are you 'calculating' to find the humidity?
It's supposed to be comparatively cool. 80 is comparatively cool to 90.
On the offchance that this is something you'd try, you could get an oil-filled space heater for the room. You said you have WTFs, so that would boost their ambient temp too (as per the care article on frogforum.net, WTFs prefer an 80-85 day temp, so the ambient temps would overlap).
I could be wrong, but I believe the questions about your thermometer and ambient temp have already been answered multiple times... In the most polite way possible, you're going to keep your animals the way you decide to, but you'll save yourself a lot of drama by not continually asking if a practice that was incorrect yesterday is somehow correct today.