So a question:
If yer furnace went out tonight, would you be able to keep your pipes from freezing? Do you have a backup method of heating your home, or at least keeping it from freezing?
We use 2 forms of heat here at our home. Wood (tied into the forced air system)is the primary (sorta), with natural gas as a close second. (the issue with wood heat is that when the outside temp is at or near freezing, it is hard not to overheat the house using wood. (you can build a fire only so small!). If we aren't home to tend the fire, then the natural gas comes on to keep the temp in the house at 50 F.
We also have electric heat in a pinch....it'll keep the pipes from freezing.
If the electricity goes out, we can still use the woodstove. It will keep the house at about 40 degrees F even with no electricity, just natural convection.
Do you have a backup heat source?