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2. Furnace (central heating) - Wikipedia

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

   In some areas electrical resistance heating is used, especially where the cost of electricity is low or the primary purpose is for air conditioning. Modern high-efficiency furnaces can be up to 98% efficient and operate without a chimney, with a typical gas furnace being about 80% efficient. [ 1 ]

3. 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 ...

4. 6 of the Most Common Home Renovations — Are They Worth It ...

   www.aol.com/finance/6-most-common-home...

   Maximize the value of new flooring by keeping the cost proportionate to your home’s value. “If you spend too much on new flooring, you will not be able to get your money back,” Harris said.

5. Thermal efficiency - Wikipedia

   en.wikipedia.org/wiki/Thermal_efficiency

   For energy-conversion heating devices their peak steady-state thermal efficiency is often stated, e.g., 'this furnace is 90% efficient', but a more detailed measure of seasonal energy effectiveness is the annual fuel use efficiency (AFUE). [10]

6. Natural gas prices surge after forecasts of a cold January emerge

   www.aol.com/news/natural-gas-prices-surge...

   The Unknown Switch That You Should Change Twice A Year On Your Ceiling Fan. According to the U.S. Energy Information Administration, about 60% of homes use natural gas for space or water heating ...

7. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   A central heating system provides warmth to a number of spaces within a building from one main source of heat. It is a component of heating, ventilation, and air conditioning (short: HVAC) systems, which can both cool and warm interior spaces. A central heating system has a furnace that converts fuel or electricity to heat.