So I've decided to post this in here not so much because I'm a beginner but more because I believe it's a beginner problem. Its something I've never dealt with before and I've tried so many different things and I've now chucked about 1300 quid at it and I'm getting nowhere fast and just wondered if anyone has any suggestions?. Oh and I'm sorry for the long one haha. So basically high temp is the problem. A little background. I've done many runs before with better results every time but stopped for a few years moved house etc. So I bought all new gear as follows. 3m x 2m x 2m gorilla tent. 4 x 600w omega disable ballast with super lumens 4 x dual spectrum hps 600w bulbs (Can't remember brand off top of my head) Full mills nutrition nute range. A b c start vitalise sugar rush Ph up and down Cal mag Mills DNA coco with cork with a small amount of guano in each pot. Some perlite and a few clay balls as well (old mixture I used to use that never failed me). 3 small 8 inch fans and one 14 inch oscillating fan. I've got a vortex acoustic extraction fan 8inch 1380m3 6 inch rvk 4 inch rvk Ducts of every size I need. Clamps blah blah. 2 8 inch rhinos with fresh carbon I have a full pumped ro system so make water as I need it. I've got 4 different temperature devices 1 has humidity. For clarity. And the room is 2 ft wider in each dimension than the tent itself. House ambient is 20 c atm the room ambient is 24.8 c. So after setting up on standard ballasts and getting it all ready temp was off the charts 40 something c. So I upgraded to 6 inch out and 4 inch in so I'd got cold air in from outside and warm air out in a diff place. Managed to get me to 41. So I got the new ballasts. That saw me 38 degrees. So the next move was to move all the ballast s and fans into the loft space and extend all the cables so that there heat was away from the room. That made no difference what so ever. Lol. So the next thing I did was go and buy the vortex 8inch. Some hard-core suction on that thing and it's dead quiet... So hook that up with some 8 inch duct. Still at 38. How does that even happen??? Opened up some more vents still no cooler. So I spent another 300 odd quid on some cool tubes and more duct. I have tried every way of piping it without drilling more 6 inch holes in the house, positive pressure, negative pressure. Every thing blowing out. U name it ive tried it but no matter what I do I just cannot get the bastard thing below 35 degrees with all 4 lights on. With only 2 lights on it sits at 29 c. I have 16 sour diesel that are 2 weeks in veg from cuts and they don't look great tbh and defo are struggling with the heat. I've added some water to the trays to raise humidity and water from beneath until I solve the problem but I don't want to switch em into flower until it's under control. No windows to use so i have to use the loft space to vent out of and into but I do have a cold air feed in a cut into a wall to the outside with a vent on. I'm measuring temp at floor level, at soil level not near the pot, at 3/4 height, at the roof and outside and I don't really get much variation between them at all which I did find odd... Cold air is directed at the floor and I've tried directing it into one of the fans that are scattered abiut the room no difference with either. All my duct runs are as straight and short as they can be with the gentler curves/bends I can manage. I've tried with the carbon on the end of 2 cool tubes in a run and a y so 2 x series of 2 6inch going into the 8inch extraction. I've also tried them open ended pulling in fresh air and blowing that out with the 6 inch extracting the hot air thru 1 carbon and the passive ducts open on the bottom of the tent. I've also tried both ways with additional vents in. I've tried blowing cold air in from outside and pushing out through carbon into the room All of these I ended up with the same temp so I bought a new thermometer because I thought that was out but it's not. Think that shud about cover it if there is anything I missed please ask away. Any help will be greatly appreciated. I could use vitalink chill but it seems to be something simpler to solve it. Do I have enough vents in open? Is there something I've missed? I'm stumped. And I've pissed about with it that much I can't even remember which way was most efficient any more. Anyway enough of the rant. Any help ya maybe able to give us would be greatly appreciated. These ladies are for me personally but ultimately i intend on growing some other strains to help out my mother who has cancer. Cheers lads n ladies.