I am using one of these and it is fantastic. It turns on (by my settings) at 78 degrees and runs the inline fan. and turns off at 77 degrees (again my settings). during the cold months I can also run a space heater to keep my tent from getting to cold. You pick when it turns on and off... I didn't know if anyone else knew about these. I got mine from ebay. They also make one that will run humidifiers and dehumidifiers.
http://www.ebay.com/itm/Inkbird-Itc...994460?hash=item33b087619c:g:hxYAAOSw-zxWpUgy
the link above was the first one I found I got mine from an American supplier for 36 bucks shipped.
http://www.ebay.com/itm/Inkbird-Itc...994460?hash=item33b087619c:g:hxYAAOSw-zxWpUgy
the link above was the first one I found I got mine from an American supplier for 36 bucks shipped.