What temperature do you keep your home at?!

Kr
I gave birth to my son at 37w4d last week and he was only 4lbs and 13oz at birth. 
He's so little and I'm so terrified of not doing what's best for him, I'm constantly changing my thermostat!
I also live in an older house and I feel the heat is never truly consistent. I have it at 72 - is it too hot? 
Any advice is greatly appreciated!