sorry bout that.my girls are alsoo taking a lot of cold during the lights off.i have a 110 and a 75 cm pipes in diameter for intake and exhaust.when lights and fans are off from 24 pm to 6 am there is like 10-15 c in the growroom,wich i think will be usefull to give the plants a nice colour to them before harvesting.expecting a lot of purple ,red buds