Home energy audits?

Does anyone know a good business that does in depth home energy audits? I just got a new to me 1970s home that struggles on hot days, like the ac doesn’t go below 77 in the daytime.

I normally keep AC that temp or 78 degrees in the daytime, but I just want to get more insulation. This house I bought has all new windows except for 2 (why did they stop at 2 left? I have no clue either). I do see some air leakage spots so far like the doorbell, so I’m trying to just make good with my money.