Kitchen Garden Forum

When i was in my greenhouse this morning there was quite a lot of condensation on the glass, so i put the fan on to get the air moving about a little, i had to leave it on until i came back at lunchtime.
This got me to thinking if there is such a thing as a humidity switch on the market, if this was wired in line with a fan it would just come on when needed.
Any thoughts on this matter would be gratefully received.

Cheers Paul, that looks as if it's just what i was thinking about, i'll just have to work out which is the one i need.
Thanks again.