why does my evaporative cooler leak water at night but not in the daytime?

at night water runs off my roof when the cooler is on low but it does not do it during the day.

seandogue8 years ago
In addition to daytime evaporation, you could be hitting the dewpoint at night, compounding the issue.
Bigev8 years ago
I bet the hose joint that is leaking expands and plugs the gap in the daytime, and contracts and leaves a gap at night.
dilandou8 years ago
I would hazard a guess and say that it doesn't do it during the day because it's evaporating.