If you are going to be painting the inside of your home any time in the near future, a single thing you want to feel about is ventilation plus the air quality. The first thing to control the air quality from the paint fumes is to make sure you are painting while in the time of the year when you can open up the windows, and never do this in the super tepid Summer weeks because you will not be able to respectfully ventilate. The fumes would just get up into the central a/c plus circulate throughout the house making it even more toxic plus dangerous, so what you need to do is have all windows opened, plus then also on top of that, you will want to buy a few portable whole-house air purifiers! By having the windows opened plus running a portable whole-house air purifier or 2, this will not only clean the indoor air conditions, however it will make it so that you can return to your home in less than twenty 4 hours after painting. The cross ventilation from the windows being opened plus the double portable whole-house air purifiers running, this will speed things up majorly in getting that indoor air conditions back to normal following painting the inside of a home, but especially if it is only a single or 2 rooms instead of the whole house. But even in the case of a whole home paint task, you just open more windows plus buy additional portable whole-house air purifiers, plus it will have the same exact effect plus clean that indoor air conditions back to normal in no time at all!