I have never had heat issues in my tent, even when it was 100 degrees outside here. The big thing is to control the room temp that the tent is in, and you should be able to keep your tent around the same temperature, maybe a few degrees higher. I run my ducting as such, filter-->ducting-->cool tube---ducting out of tent--->fan. Works great, no smell or heat issues. There is a good 8 feet maybe more of ducting between the fan and filter including the cool tube, and it works just fine. I think its about having the appropriate fan for the job, my fan is a 500cfm inline, used for a 4x4x6.5 tent. I also have an oscillating fan in there of course to keep the temps and humidity down. Need to get a veg area set up, so I can reveg the biggest and best I have this time that way I can have huge colas all the way across instead of this huge variation I have with all these different strains, really kills the yield ya know..I want to do a sea of green with a bunch of clones. I think I can easily double or triple what I will yield this time if I can have buds like my violator or wembley in a nice even canopy all the way across. Granted Im not the biggest person, but the violator has a cola that is bigger than my forearm. Oh hell yeah....