Originally Posted by camicat
You use the word "adequate", and the law uses the word "un-inhabitable".
If it is LEGALLY un-inhabitable, then landlord/tenant law applies. Otherwise, as Scott said, it would be your local government.
I don't know how a judge would rule on 68 degrees being un-inhabitable. My sense is, while 68 is frigid, it's livable. But, I ain't no judge, and I've been wrong before. Maybe you'll get a judge who really, really likes to be warm. Or not. I don't know.
If you wish to bring this to a head, you'll have to move into a nice warm hotel room, and begin your process. If that's too radical for you, maybe you should stick with your local remedies. After all, "un-inhabitable" means exactly that. You certainly couldn't complain that it was un-inhabitable while you were habitating there.