Both sides of the tinfoil is shiny, says my mom. So we just put it on randomly.
The top is open, all sides are closed. If it gets too hot I'll poke holes or remove a piece. Thank you!
And I'm at home the whole time, I'll have to set a timer on my phone for the night that I just check on the temperature in the cage every hour or two. He's in the bed through the day, and the bed is cozy and warm, so he'll do fine through the day. Its the night that I'm worried about.
I'll make alarms to wake me up and check on the cage through the night.