High humidity, high moisture, and termites.

We recently bought a rental property with a basement that gets humid in the summer.

Not sure if you're experiencing puddles that you can see, or just a humidity that can be felt, or worse smelled.In my experience, dampness can come from several locations at once, especially the older the property. 

Both properties were in CA (so not much rain/humidity).

(cables, turnbuckles, additional collar ties, etc.)Old houses settle, bend, warp and flex as wood changes dimension with humidity and tends to shrink over time.

If it's cold, crank up the heat, if it's hot and humid, crank up the A/C.  

I am going over today and buy a hygrometer to see the humidity level. 

It has an awesome phone app that I can control and see the temp and humidity.

Water heaters only last 12 to 15 years here.On the climate and the AC, I am of the opinion that the dry climate of Las Vegas is easier on AC systems than humid climates.

In wood and laminate floors, a lot of flippers don’t realize they need to let the flooring adjust to the humidity of the home, so they’ll let it sit in a cold, dry garage (where it shrinks) until they install it in a warmer, more humid home (where it expands).