Thanks to all of the informative comments. I guess I finally just got fed up with the whole "if I have to repair anything, your gone" kinda attitude. keep'em coming though. I would like to know if he can be held responsible for part of the utility bill as well since he's known about the problem at the time he purchased the house. He had a new roof put on (which he includes in our rent), but declined the insulation.
Wouldn't hold my breath on that one. I find it to be highly unlikely that any court would find your landlord responsible for your high heating costs - though you could argue that the house is 'unlivable' and withhold future rent, maybe.
Our land lord says that if he has to put money into the house he'll just sell it which seems like a threat.
This is probably an empty threat. He's not going to up and sell in the middle of the shittiest housing market in forever, out of a fit of pique; he simply doesn't want to pay anything he doesn't have to to keep the house up. It's understandable, and what more, you aren't forcing him to pay. Take action and force him to pay. Alternatively, since you aren't on a new lease, keep shopping around for a new place, a better one; this likely isn't going to end happily for you no matter how right you are.