okay here goes nothing, my house starts out with a finished concrete basement that has a rec space 12 wide by 16 long, along with a 9 by 9 bathroom, then the first floor has my living room and kitchen, 3rd floor has 2 bed rooms and a half bath, along with another story with an attic unheated, just used for storage. its a 4 story house but not including the attic because of no heat i consider it a 3 story. the whole layout of my house is roughly 30 long by 14 wide essentially 2 rooms stacked on top of eachother 3 stories high, i figured if i put it in the basement it would not heat the bedrooms 3 stories up so i plan to install it in my living room blowing out towards the kitchen and hopefully having the heat rise to the bedrooms, if i have to install heat registers to allow the hair to go through i will. god i hope this helps explain my stupid house i could afford at the time, lol..it has new insulation, windows, wiring etc. so when i say around 900 square foot, imagine 2 rooms stacked 3 high and you have my house, roughly 14 by 30...