Hashyanswered grow question 3 years ago I also grow in the loft. I recently added a few 125mm holes in my wall, one for hot air out one for cold air in. Before I did that I used to have a length of ducting running from the eaves on the cool side of the house, I used a cardboard box to create a sort of manifold to get it into the eaves. I did the same on the extractor ducting but to the hottest side of my house. It can be a real pain with heat up there at this time of year.