Furnace air filters in a large home should be replaced about every three months. Individuals with larger homes may need to replace filters less often because the air has more room to circulate, thus reducing the amount o... More »

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A number of companies, including Filtrete, Honeywell, TrueBlue and Rheem, manufacturer furnace air filters. These filters comes in different sizes, so check that a new filter is compatible with the furnace before making ... More »

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One symptom of a blocked air filter is that the furnace stops operating. Furnaces have an over-limit cutoff switch that stops operation if the temperature in the heat exchanger becomes too high. As a result, according to... More »

Intertherm furnace filters, as well as filters compatible with Intertherm models, are sold online through mobile home supply stores such as Magic Mobile Home Supply, specialty filter suppliers such as Filter USA and onli... More »

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To replace central heating and air conditioning air filters, turn the air conditioner off, open the housing to the vent, remove the old filter, slide the new filter in and close the housing. Replace the air filters at le... More »

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The supplies needed to service a furnace are foil tape, an air filter for the furnace model and an oil filter and nozzle for oil-powered systems. The tools needed are a screwdriver, wire brush, shop vacuum, strap wrench ... More »

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To clean a furnace, a person needs foil tape, an air filter, screwdriver and a wire brush. A shop vacuum, strap wrench and combustion analyzer are also needed. If a person is cleaning an oil-powered system, an oil filter... More »

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