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2. Furnace (central heating) - Wikipedia

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

   The fourth category of furnace is the high-efficiency condensing gas furnace. High efficiency condensing gas furnaces typically achieve between 90% and 98% AFUE. [3] A condensing gas furnace includes a sealed combustion area, combustion draft inducer and a secondary heat exchanger. The primary gain in efficiency for a condensing gas furnace, as ...

3. Heating, ventilation, and air conditioning - Wikipedia

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

   A drawback is the installation cost, which can be slightly higher than traditional HVAC systems. Energy efficiency can be improved even more in central heating systems by introducing zoned heating. This allows a more granular application of heat, similar to non-central heating systems. Zones are controlled by multiple thermostats.

4. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   The energy cost of heating is one of the main costs of operating a building in a cold climate. Some central heating plants can switch fuels for reasons of economy and convenience; for example, a home owner may install a wood-fired furnace with electrical backup for occasional unattended operation.

5. New efficiency standards for home furnaces unveiled [Video] - AOL

   www.aol.com/news/biden-administration-unveils...

   The new standard would require new furnaces to convert 95% of the gas they burn into heat. (Older models may have a conversion rate as low as 56%.) DOE estimates that this efficiency improvement ...

6. Condensing boiler - Wikipedia

   en.wikipedia.org/wiki/Condensing_boiler

   The International Energy Agency has said that new gas boilers (or gas furnaces) should be banned no later than 2025. [11] Many installations and appliances have a life-span of 25 years, leading for calls that the bans must take place immediately, or at latest by 2025, because otherwise targets of net zero by 2050 cannot or are unlikely to be ...

7. Home fuel cell - Wikipedia

   en.wikipedia.org/wiki/Home_fuel_cell

   Operating costs for home fuel cells can be as low as 6.0¢ per kWh based on $1.20 per therm for natural gas, assuming full electrical and heat load utilization. [where?] [citation needed] Residential fuel cells can have high initial capital costs – As of December 2012, Panasonic and Tokyo Gas Co., Ltd. sold about 21,000 PEM Eni-Farm units in ...