I keep it cool at home, but the children get sick anyway

Hello. Coolness alone does not always help maintain health. Of course, it is better than stuffiness. But this does not mean that it is necessary to somehow constantly turn the DM into a cold place. After all, where it is cool and important, a fungus can form. So follow the rule of the golden mean. But the formation of a fungus can just become a factor that provokes a fungus, which causes many diseases. I think you need water proofing basement near me  to keep in mind.