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www.reference.com/article/type-furnace-cost-efficient-gas-oil-furnace-59f4782781feba81

Typically, gas furnaces cost about 10 to 25 percent more than oil furnaces initially, but the average cost of heating oil is higher than natural gas. Gas furnaces are also about 10 percent more efficient than oil furnaces.

www.reference.com/article/running-air-conditioner-vehicle-waste-gas-222bfa9f29320cba

Running the air conditioner in a vehicle in hot weather reduces fuel economy and wastes gas, according to the U.S. Department of Energy. It estimates that running an air conditioner can reduce a vehicle's fuel economy by more than 25 percent.

www.reference.com/article/gas-furnace-470c343b8c6481f0

A gas furnace is a part of a heating system, the purpose of which is to convert gas to heat. Gas furnaces are most commonly used in residential systems in cold weather climates.

www.reference.com/article/parts-gas-furnace-7a6572c5615d0b86

Most gas furnaces contain five main parts, all of which are essential to the heater functioning properly. The components include a burner, heat exchanger, ductwork, a flue or vent pipe and an ignitor to start the process.

www.reference.com/article/difference-between-oil-furnace-gas-furnace-bcbf33e9a2371b85

Oil furnaces burn heating oil, which is similar to diesel, while gas furnaces use natural gas. Heating oil is delivered by truck to each customer and stored in an aboveground storage tank. Natural gas customers are hooked up to the local gas company lines.

www.reference.com/article/cost-efficient-replace-gas-furnace-heat-pump-5dd017429cf1813d

The cost of gas-fueled furnaces varies based on the local price of gas, while the cost of a heat pump varies depending on local electricity costs. The efficiency of the furnace being replaced can have an effect on the total cost, as well.

www.reference.com/article/much-gas-furnace-maintenance-usually-cost-ded3e1b6c72a63bf

As of 2015, professionally done annual maintenance for a gas furnace costs between $80 and $130. The cost can be as little as $25 in parts if an owner can do the work himself.

www.reference.com/article/should-furnace-air-conditioner-serviced-976709d101dad444

Air conditioning systems should be serviced at least once a year. Furnaces need to be serviced every one to five years, depending on the type of furnace. Experts recommend having air conditioning systems inspected in the spring.

www.reference.com/article/electric-furnaces-expensive-gas-furnaces-14508d8afdb8e1a8

In the short term, purchasing an electric furnace is cheaper than purchasing a gas furnace. In the long term, gas furnaces are cheaper to operate than electric, according to Bryant Air.

www.reference.com/article/gas-refilled-air-conditioner-8b18800c22e46c3d

Gas is refilled into an air conditioner by using a compatible refrigerant that is added into the unit’s compressor lines. The air conditioner is set at its highest level while taking in the Freon gas. The Freon kit’s service and tap valve must be connected to the unit’s compressor lines.