The growtent is 4ftx4ftx6ft with a 8 inch inlet fan from outside and the same size extraction fan (both well disguised) leading outside plus a 18 inch oscillating desk fan at floor level, it has venting flaps on three sides near the bottom,so a more powerful outlet and /or inlet should be the answer (fu"*in obvious when i think about it).Once again i bow to your wisdom Scarlet and will address this problem in a few weeks time when flowering cos as i said they look great at the moment under 250wts ,70 degrees steady. Incidently i've been growing for some years now but grew in a loft or outside building where temparatures were alot easier to control and being discreet wasn't so much of a problem where as now i'm in a back bedroom (in a tent ) with neighbours very close by . I'll try to post some pics at some point ,bye for now