Space heater instead

We are having a cold snap here in GA right now and it's also really low humidity!! I did not move here for this weather!! I bought a radiator type space heater set to 75 (this is a compromise because the snakes are in the bedroom) they have a UTH On Tstat and a CHE on dimmer. It's keeping warm sides at 84 and cool side at 77/78... The UTH is set at 90 and I check them daily with temp gun. I also bought a humidifier for the room and at least we slept better lol! But not doing much for cages. Staying at around 55-60%, go higher when I must and wet their towel. Thoughts? Warm enough on cool side? I'm a nervous newbie!

I live in Texas myself. Very curious to look more into the idea of just running a space heater when my collection grows. For now though I already have heat mats set up. Though I notice that VPIs care sheet mentions that having an actual gradient is apparently better? So much info out there.

Personally my "cool side" is 81-82 with a 88-90 degree hot spot for our BP. I try to read every care sheet I can find and these seem to be the average suggested temps.