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2. Is It Time for a Furnace Upgrade? 10 Warning Signs to ... - AOL

   www.aol.com/time-furnace-upgrade-10-warning...

   If the furnace is not heating the home evenly, you might need to clean the air ducts, replace the air filter, or consult an HVAC technician to determine the problem. In the worst case, one or more ...

3. 6 vital home units: When to check or replace your furnace or ...

   www.aol.com/6-vital-home-units-check-101403555.html

   How often to replace major systems in your home Air filters: In general, says Consumer Reports, disposable air filters last three to 12 months. That can vary according to the system you have and ...

4. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Such a system contains a boiler, furnace, or heat pump to heat water, steam, or air in a central location such as a furnace room in a home, or a mechanical room in a large building. The heat can be transferred by convection, conduction, or radiation. Space heaters are used to heat single rooms and only consist of a single unit.

5. Furnace (central heating) - Wikipedia

   en.wikipedia.org/wiki/Furnace_(central_heating)

   The second category of furnace is the forced-air having atmospheric burner style with a cast-iron or sectional steel heat exchanger. Through the 1950s and 1960s, this style of furnace was used to replace the big, natural draft systems, and was sometimes installed on the existing gravity duct work.

6. What Temperature Should You Set Your Thermostat When You're ...

   www.aol.com/lifestyle/temperature-set-thermostat...

   According to the U.S. Department of Energy, you can save 10 percent on your heating bill when you change your thermostat by 7-10 degrees for just eight hours a day.

7. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   This limit controller may shut the furnace off if the blower fails or if something is blocking the air flow. The heated air is then sent back through the home through supply ducts. In larger commercial applications, central heating is provided through an air handler which incorporates similar components as a furnace but on a larger scale.