If you heat with gas, oil, or propane you can save anywhere between 50%, up to 85% on your heating costs by installing a "dual fuel" system. It is a "fossil fuel" furnace matched with a heat pump. Depending on your local electric rates, the savings are tremendous. Going from a $300.00 gas bill to a $40.00 gas bill and a $25.00 raise in electric bill are typical results, when the system is installed correctly. These saving are real. And the heat pump is a high efficiency air conditioner too. A high efficiency heat pump installed on your present furnace usually costs around $1800 more than regular air conditioner would cost. Around $4,000 to $5,000 total, for a Trane XL14i 3 ton heat pump, completely installed on your existing furnace. People with this system usually save well over $1,000 per year!