Don't worry about them getting "cold," or cage temp. Boas don't care. They don't have heat pits like BP's and other pythons do.
As KMG said, if he is eating, all good.
Additionally, moving to every 14 days won't hurt him and might help the food response.
Boas generally eat "smaller" meals than other larger snakes can handle. They still grow without issue and it might even be better for them. I've experimented with different food regiments for my different boas. I tend to think less is more with them.
My boas won't eat unless they strike, but that's not usually an issue. If your guy eats anyway, more power to you.
I have a BP who prefers I leave and walk away most of the time, but once I walk away she generally grabs the prey. I do heat up the prey for her, but if she doesn't eat it quickly, I just offer the following feeding. She is 9 years old though. I also have a corn snake who generally doesn't strike and is shy and most of the time I leave it and walk away and she eats like clockwork.
Any other questions, feel free to ask.
Good luck.