He's about 8 months old.

His basking spot under the light gets to about 87-90 and the rest of the cage won't go above 74. I believe the main culprit is that the cage is located across from the front door. Only place I could put it.
Yes, that's a humidifier and it's a mist or vapor model I was given for the cham by my neighbors.

I figured out that I could move the cage to the 'office' which is much more stable temp wise and quieter with less constant movement. However, I have two questions about that:
1 - WHEN could I move it?? Should I wait a few days to a week to let him settle down before moving? Or should I do it in the next day or two to "get it over with"? I have a holding cage for him, so a place to go while the cage is moved isn't a problem. I just don't want to stress him out any more than he already is from the shipping.

2 - The office is where the computers are. I would hang a thick curtain in front of the cage to block the light at night (since my BF is a night owl with the computer), but would having him in here cause any other problems? The cage would be on the opposite side of the room from said computers.

Any suggestions or comments on this are much appreciated.