Originally Posted by BrettPreston
What are good ways to regulate temp, I live in a flat currently
As I referenced earlier in this thread, the cheapest and easiest way to regulate temperature is with a plastic laundry tub ($8 at WalMart), water, and a t-shirt. You put the fermenter into the laundry tub, then fill the tub with water up to a few inches below the level of the wort in the fermenter (so it doesn't float off the bottom of the tub). The water will "sink" the heat away from the fermenter. If temperatures start warming up too much, you can drop some frozen water bottles into the water to keep the water (and therefore wort) temperature down.
If you're using a carboy, you can additionally cover the fermenter in a wet t-shirt, which will evaporate water away, taking heat with it, and wicking up more water from the tub below. Some people also add a fan in this configuration to stimulate evaporation and thus cooling.
The other benefit to this arrangement is that you've vastly increased the "thermal mass" of your wort, meaning you've dampened temperature swings it would experience as the ambient temperature rises and falls periodically. That is, if the room temperature drops at night, the combined volume of the wort plus the water will take longer to cool with the ambient temperature than the wort alone would. By the time it starts dropping by a few degrees, the room could already be starting to warm up again as morning arrives.