We have a gas furnace from the original install in 1994.

We've seen a nice decrease in our Natural Gas bills lately due to the fact that bulk gas prices are way down due to the huge supplies that are coming online in North America due to good ole Fracking. As long as this is happening, these advertised monetary savings will not be realized over the short term. Great for us; however, governments don't like this as it cuts into their revenues hence contributing to higher deficits & debt.

A high efficiency furnace might make you feel greener though...

TAM