I just moved into a house with no place to put all tanks. I had to build a room in my basement that is 500sqft , it cost me over 1000 dollars to build it but it was well worth it. I heat the whole room instead of the tanks its much cheaper that way. It would cost me a arm and a leg to heat all of my tanks. I have 2 225s 2 75s 1 120 and 50

having a single heater in your basement rather than having multiple heater is better and less expensive in terms of electricity consumption and one great thing about it is that when you have stock clean water to use you don't need to worry about temp shock on your fish. on my case... im unlucky since i have no basement to make it my fish room.