Wall switch plate is warm/hot to the touch? double switch at the top of the basement stairs is heat up,...

double switch at the top of the basement stairs is heat up, took cover off, no smell, smoke etc, a short time ago a warm box
No hot wet pressure contained by the entire...
Answers:    Sounds similar to a loose connection or a worn out switch. Repair or replace as required. If you are not experienced doing electrical work, I recommend hiring an electrician to diagnose the problem and next fix it.
My DE pool filter it not really filter...
The wiring may be using the wrong type of chain, causing excess steam (due to too much ampage passing through). It can potentially start a fire. You should receive an electrician to check it out.