Am i suppost to be worried about ground or air tempature with a pacman?

My tank's air tempature is about 69.1F which i am very worried about... Though the ground tempature is 78.1 F. I do have foil ontop of the cage, but i don't want to fry him either.


I really need some advice on what to do here, what to get that can help me with this problem... Currently my home base for supplies is Pet smart.


I would really appreciate if i could get all the help i can!

Thanks!