Although the attic/loft seems a great place look closer and is possibly the worst place to grow, with high temp. swings and possibly water leaking below, and very easy for smell to permute the building, even a cellar or basement is better, the tent is a great place to grow, just consider the location of the tent ....lol I'd use a shitty tin garden shed before a loft, with the forthcoming spring you garden could be an even better option?