How To Stop Bed Bugs

I'm having a heat treatment done on my house today for bed bugs. When is it safe to move
back in? Would it be okay to go in today after the treatment or do I need to wait a few days?
If I went back today, would it be okay to turn on the air conditioner?
I know it sounds stupid but i'm so scared the little freaks would somehow pop back to life lol

Also…would the heat being pushed into the house get to bed bugs in the chimney/fireplace?

My mother and father has been living in there home for over 30 years. and now a problem has come up that they have bed bug and have try getting rid of them and it has been very hard and stress for them. so i wonder if there is any help that they can get from the government or assistant from anywhere.

My bed is next to a window with a screen on it, what is this bug I'm really scared I took a picture but I don't know how to upload it. I dont think it's a bed bug I looked at pictures and I don't think It matched. The bug was on my pillow