Standard fiberglass furnace filters should be changed once a month, and 3-inch high-efficiency furnace filters should be changed every three months. Washable furnace filters should be cleaned once a month. More »

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The igniter, flame sensor and high-limit switch are the parts of a furnace that can be replaced. Other replaceable furnace parts include the mounting bracket, fan blade, control board, capacitor and drain pan. More »

A gas furnace should be replaced when the furnace begins making weird noises, reaches a certain age or displays decreased efficiency and after the burner flame turns yellow. Generally, a gas furnace should be replaced wh... More »

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An electric forced air furnace's filter should be cleaned or replaced every month during heating seasons and once every three months for the rest of the year. A technician should also inspect and service the furnace once... More »

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Replacing a gas furnace typically costs between $1,700 and $6,000 as of 2015, with installation of a high-efficiency furnace costing toward the upper end of this range. However, local labor rates and additional ventilati... More »

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Carrier's line of furnaces include many that have a high-efficiency rating. Some Carrier furnaces are so efficient that they have earned the U.S. Environmental Protection Agency's ENERGY STAR rating. More »

www.reference.com Home & Garden Heating & Cooling

Preventative maintenance tips for your heating, vacuum and air conditioning system include keeping the area surrounding the outside unit clean and free of debris, checking the filter and changing it at least once every t... More »