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>"Obama printed money"
If that's how you feel about it just don't turn it in on your tax return.
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A high efficiency furnace will not be able to use your old chimney. Most are vented via a 2 inch diameter pvc. Many also use pvc to bring combustion air in from outside. Depending on the home that you are putting it in, it could factor into the cost (how difficult is it to run the pvc vent line).
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Yes and no. When we changed to a PVC vented system the vent ran straight up the old furnace flue, no problem.
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The furnace room is on an outside wall ahd has a couple feet above ground. I don't think it will be a problem to run the PVC out if neccessary.
Thanks for the info Davester. I remember the gas company saying something about them doing energy audits if you call. Time for me to do some research.