It gets in the low 60's or so at night here, and during the day it's maybe around 70. I obviously need a way to heat my small grow tent: 2 x 4 x 7 feet. I'm assuming the best way to do this will be a ceramic heater coupled with a thermostat control unit to turn it on when it gets below a certain temperature. My only concern is, how well will this work when I have 2 fans (one out, one in) pulling cold air in (will the heater be on 24/7?) and because of the small amount of space, I'm slightly worried about burning the plants. Any tips on heating?