I agree about the rocks. However the general principle is sound. A few thoughts I've had on this are:

A) heat ceramic bricks (maybe purpose built) and transport THEM indoors.

B) heat cast iron and bring it indoors.

C) Heat hot water and use the power of convection to circulate it with impromptu piping throughout your house (possibly a more long term solution)

D) Heat water in a big cast iron dutch oven and bring it inside.

There's also the good old 'mr buddy' heater which has an automatic low oxygen shutoff switch. I plan on purchasing one as soon as I have a free 85 dollars.

I have a carbon monoxide detector in my townhouse and recommend everyone get one if possible.

In that respect my plan in an emergency is I have about 3 days worth of spare propane. I will bring the propane stove indoors and run it in spurts while having a window(s?) cracked. At least until I can get a mr. buddy.

If that fails, I'll build a mini wood stove out of some old steel cans, a barrier material to avoid fires (such as brick) and some steel ducting from the home supply store to ferry out the fumes.

More than likely though I'll drive the 30 miles to my sister's house and bum in with her since she has a real wood stove <img src="/images/graemlins/smile.gif" alt="" />