you won't have an issue all together I run at least 10,000 watts for my entire house growing and living. My last bill was $1115 but normally around $800. I use to have a $600 bill in 2 bedroom apt for like 3 years, now I am in a house so I cranked it up a bit. I have never had a problem just pay the bill. About the ventalation cut a hole in the wall or the door and put a vent in just fix it when you move out.