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2. Annual fuel utilization efficiency - Wikipedia

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

   For example, a 90% AFUE for a gas furnace means it outputs 90 BTUs of useful heating for every 100 BTUs of natural gas input (where the rest may be wasted heat in the exhaust). A higher AFUE means higher efficiency. The method for determining the AFUE for residential furnaces and boilers is the subject of ASHRAE Standard 103.

3. Furnace (central heating) - Wikipedia

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

   High efficiency condensing gas furnaces typically achieve between 90% and 98% AFUE. [3] ... One of the benefits to a single-stage furnace is typically the cost for ...

4. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   The degree of efficiency of the system has been calculated at 90%. [8] In the 13th century, the Cistercian monks revived central heating in Christian Europe using river diversions combined with indoor wood-fired furnaces.

5. The Rise of Carbon-Neutral Neighborhoods - AOL

   www.aol.com/news/rise-carbon-neutral...

   The Mewtons agreed to renovate their home to lower its emissions, and within a year, contractors encapsulated their crawl space, upgraded insulation, and installed a new furnace—at no cost to ...

6. AOL - Finance News & Latest Business Headlines - AOL.com

   www.aol.com/real-estate

   Get breaking Finance news and the latest business articles from AOL. From stock market news to jobs and real estate, it can all be found here.

7. 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]