 Most heating and cooling system failures are caused by dirt and neglect. It's important that you maintain your heating and cooling system to prevent future problems. Keep your heating and cooling systems performing properly by cleaning or replacing the air filters often, and having annual check-ups.
You should check thermostat settings to ensure the heating and cooling system turns on and off at the programmed temperatures and check system controls to make sure they're functioning properly. Check the heating and cooling equipment to assure the system starts, operates, and shuts off properly. Inspect the condensation drain in your central air conditioner, furnace and/or heat pump, if plugged, the drain can cause water damage to your house, and breed bacteria and mold. It's best to check the cooling system in the spring and the heating system in the fall.
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The cause could be air duct problems, inadequate leak sealing or insulation. If your home is improperly sealed or insulated it doesn't matter how efficient your heating and cooling system is, your home will not be the right temerature and your system will have to work harder. A dirty burner or cracked heat exchanger can make the burner not function properly. Both can cause the equipment to operate less safely and efficiently.
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The problem could be poorly operating or incorrectly sized ductwork. Sealing leaky ductwork could be a solution. Changing your heating and cooling system's filters may also help.
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Your air duct system might be the wrong size or there could be a problem with the inside coil of your cooling equipment. A dirty coil reduces the system's ability to cool your home and causes the system to run longer and decreases the life of your equipment.
If your heat pump or air conditioner is more than 12 years old you might consider replacing it, or if your furnace or boiler is more than 15 years old you should consider buying a new one.
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 Air leaks should be sealed before adding insulation. Be sure to wear safety masks and gloves when intalling insulation. The best place to add insulation is usually in the attic. Doing so can improve temperature stability throughout your house.
It is recommended by the U.S. Department of Energy that insulation levels for every part of the house should be tailored for varying climates. It is important to perform a Combustion Safety Test after sealing air leaks to make sure all of your gas or oil burning appliances are functioning properly. It's also a good idea to have your home tested for radon.
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REPAIR 
