I have a 140g, ~22in ball in a 20G terrarium. UTH under the hide on the hot side and a CHE above the hot side. I'm using reptibark substrate and I have it about 1/2 in thick.

I'm just wondering WHERE ya'll measure your temps? I have a digital thermometer/hygrometer on the warm side and an analog one on the cool side. I have a temp gun that I'm using to measure the temp of the substrate.

I'm getting ~70 with the analog thermometer on the cool side. It's positioned about an inch off the ground on the back wall. When I use the temp gun to measure the substrate I get ~70. I know this needs to be higher.

Using the temp gun I'm getting ~90 under the hide on the warm side (above the UTH). The digital thermometer reads ~80. It's sitting on the ground in the front corner.

I have black mat board covering 3 sides and I've closed off some of the top with foil.

What am I doing wrong? How can I raise my temps? I don't really have the option to raise the temp in the room. Thanks in advance for all the suggestions.