I've got a 1.2m x 2.4m x 2m tent coming next week with 2 5inch extraction kits.. I've been told that a tent that size needs 2 extraction kits set up..but I wondered if it would be better to have 1 extraction kit to pull hot air out the tent and then the other at the bottom of the tent to pull fresh air from outside into my tent? I'l need to plug it up to a time though to go off when lights go out so it doesn't get too cold..