Is it ok to have my ac on if i have a vicks humidifier on for my sick 7 month baby?

Yes: Room temperature and humidity are two different things. It is e to have your ac on and still use a humidifier. Just don't get the rooms too cool or too hot when baby is sick. Dress in same clothes layers you are comfortable wearing in that temperature. Too many parents overdress their kids wen they are sleeping, and this is not good for them.