Dual-Fuel Heat Pumps

A dual-fuel heat pump is an electric heat pump and a gas furnace all in one—offering you maximum efficiency during typical Southeastern winter weather, and a boost of gas heat when the temperature falls below freezing.

In the Tennessee Valley, where temperatures rarely drop below freezing, and we enjoy some of the lowest electricity rates in the United States, a heat pump can be the most efficient way to heat your home. In those few instances when the temperature drops below freezing, however, a gas furnace may be a more attractive option. But combining the two systems into one, you can have the benefits of both systems.

How It Works

When the temperature is above 35°F, the dual-fuel pump uses electricity to heat your home, as necessary. This type of heat circulates evenly throughout your home, and isn’t too dry, keeping you warm and comfortable. But when it gets really cold (below 35°F), the heat pump switches to gas heat for better efficiency and comfort.

Because there are advantages to both heat pump and gas furnace based on the outdoor temperature, a dual-fuel system really does offer the best of both worlds. It’s the most comfortable heating system at any outdoor temperature, as well as one of the most versatile, efficient and economic heating and cooling systems on the market.


A dual-fuel unit can cost $600 to $1,000 more than conventional heating and cooling systems, because you are essentially getting two systems in one. But the amount you pay up-front will quickly be repaid over the next two to three years in lower heating bills. You’ll be glad you spent more on a better system.

Choosing a System

There are several different brands and models to choose from. The most noticeable difference between them will be the price, and whether they’ll be installed inside or outside your home. There are fewer packaged models available on the market. These systems are also generally more expensive than split systems.

Air Source Heat Pumps

This most common type of heat pump works solely by exchanging hot air for cool air—heating your home in the winter, and cooling it in the summer. There are two basic types: packaged, and split-system. The layout of your home will usually determine which one you choose.

Geothermal Heat Pumps

Looking for the most energy efficient heat pump system of all? It’s a geothermal heat pump, which uses the constant temperature of the earth to warm and cool your home regardless of the highs and lows of outdoor air.

Heat Pumps

Heat pumps are ideal in southern climates: In the winter, they draw warmth from the air to keep you warm; in the summer, they remove heat from the air to keep you cool. And they do it all in the most energy efficient way possible.

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