My sons room is reading 77, but I have heat set to 69.

I’m so confused. Every night my sons room has been getting extremely hot, causing him to wake up. But mine and my husbands room is freezing.

Often times my sons room reads 76 by the middle of the night...I just don’t understand because we have the thermostat set to 69 or 70.

His room is over the garage too, which is more so doesn’t make sense because usually those rooms are colder?

Any ideas?