Efficient Heating & Cooling The Home Heating Cost Comparison identifies the most efficient heating source as a heat pump, specifically a geothermal heat pump. The most expensive way to stay warm is by a propane gas furnace. The costs reflect the dollar amount to heat your home during the winter season. Use our Heat Pump Calculator to estimate the savings potential of replacing your older unit with a new high efficiency system. Plus, you may qualify for a federal tax credit available to homeowners. Spotlight on Geothermal Geothermal relies on the Earth's natural thermal energy to heat and cool water underground. The system can operate very efficiently because the temperature underground is about 57 degrees. As a result, geothermal uses 40-60% less energy than a standard heat pump and reduces harmful greenhouse gas emissions. Many Nashville-area organizations, businesses, and communities are looking to geothermal as an alternative energy option, including:
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