The best way to tell if your furnace is a high-efficiency model or not is to take a look at the vent. If it is a metal vent, chances are it is NOT high efficiency. High-efficiency furnaces exhaust with minimal heat that they actually vent with PVC plastic pipe. All of the heat that used to exit your home via that old metal pipe now gets to stay in the house and keep you and your family warm and cozy. We actually are running a great furnace special right now as a matter of fact. You can have a new, state of the art, high-efficiency furnace completely installed for as low as $29.99 per month. The new furnace may save you more than that on your monthly gas bill. Call us or visit http://ghacwv.com/quote-request for a free in-home visit from one of our comfort consultants.