Well, new thermostat didn't do jack. Gonna call out some of topgunz1 family who owns a heating/ac company to take a look at it tomorrow. Landlord footing the bill, of course.
I can't help with any troubleshooting advice, but I do have a couple electric heaters from my camp in my garage if you want to borrow them for your bedroom until you get this resolved, as its gonna be cold the next few nights.
I had a small one last night, closed the doors to my bedroom, and actually got hot because of it! I appreciate the offer though! Gonna pre-heat the bedroom tonight before I get home though...I didn't like getting into that cold bed in the cold room...took a few minutes to warm up!