I installed an interior heater yesterday.
It is supposed to keep my interior warm enough to avoid frost build up.

I bought a Pyroil Interior Heater from Crappy Tire - hope it works!
Installation was easy - ran the wire through to the engine on the passenger side, ran the wire to the front, installed the plug and plugged it in.
The one thing I did not do is mount the unit to the dash. I have it resting in the center of the dash, pointing at the windshield - I tested it for a few hours yesterday and all was fine.

I've skipped the gym way too much this winter because of 6am frosty windows. I'd prefer a remote start but with a std it's too big a pain and from what I hear expensive as hell.