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system. Geothermal has the least impact on the environment, costs the lowest to run, and is the most reliable. The initial expense is great but the long-term payback for the investment is the best there is.

Another big point to consider when purchasing a new furnace is installation charges. It is important to note that just because a contractor charges a high rate, it doesn't mean they will install the furnace correctly. Some contractors inflate their installation charges and mark up furnace prices, while others perform quality installation for much less. Always get estimates from more than one contractor, and always ask for references. Ninety percent of furnace failures are caused by poor installation. Remember that a furnace is only as good as the person putting it in.

Lastly, you should compare warranties that are offered on different furnaces. High-end furnaces such as Carrier and Trane offer a ten-year parts and labor warranty. Carrier, Trane, and Amana furnaces all offer lifetime heat exchanger warranties. You may want to look at the warranties of less expensive brands to see if they offer comparable warranties.

Any average new furnace should last twenty to thirty years, regardless of the fuel type or brand as long as it is installed properly and maintained regularly. To keep your furnace running efficiently, you should have it serviced and cleaned annually by a certified HVAC technician.

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