Ok I can't seem to get it right. First off my house is heated by window ac's so my house is always at diff temps. Btw 64 in mornin to up to 80 in afternoon. I have very little control over this.
Second I have a ten gallon tank with a screen top, 2 hides, water bowl, and branch. I'm using reptibark wood chips for substrate. I am using a ifr heat bulb for now but I have a 10-20 gal uth but no t-stat for now?
Now for my q's.

1- is a ten to small to have a good temp grade? I'm having big trouble I can't get the surface temp on the warm side under a hundred I know I need to get a dimmer for it until I can get a t-stat.
2- do I need to build a lid for this tank instead of using the screen?
3- if I do build a lid for the tank will my uth provide enough heat to the tank or will I need another heatsource for the coolside?
That's all of my q's for now I hope