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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...

   The age of your furnace is a key indicator of when it’s time to consider a replacement. Typically, a furnace will last about 15 to 20 years if it's properly maintained and repaired whenever a ...

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

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

   Replacing an HVAC system can be costly. Here's how long you can expect your system to last, along with other key home devices

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. 5 Key Signs You Need To Replace Your Appliances - AOL

   www.aol.com/5-key-signs-replace-appliances...

   Under this rule, if your appliance is 5 years old or newer, it could be better to repair; if it is between 5 and 10 years old, it’s a good idea to compare the costs of repairing to replacing ...

6. 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.

7. Annual fuel utilization efficiency - Wikipedia

   en.wikipedia.org/wiki/Annual_fuel_utilization...

   The annual fuel utilization efficiency (AFUE; pronounced 'A'-'Few' or 'A'-'F'-'U'-'E') is a thermal efficiency measure of space-heating furnaces and boilers.The AFUE differs from the true 'thermal efficiency' in that it is not a steady-state, peak measure of conversion efficiency, but instead attempts to represent the actual, season-long, average efficiency of that piece of equipment ...