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2. Forced-air gas - Wikipedia

   en.wikipedia.org/wiki/Forced-air_gas

   High-efficiency condensing furnaces condense the water vapor (one of the by-products of gas combustion) and extract the latent heat to pre-heat the incoming furnace airflow, using a second heat exchanger. [2] This increases the efficiency (energy delivered into the building vs. heating value of gas purchased) to over 90%.

3. Annual fuel utilization efficiency - Wikipedia

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

   AFUE stands for annual fuel utilization efficiency, a measure of space-heating furnaces and boilers. It is a dimensionless ratio of useful energy output to energy input, expressed as a percentage. Learn how to determine the AFUE and see typical values for different fuels and technologies.

4. Rheem Manufacturing Company - Wikipedia

   en.wikipedia.org/wiki/Rheem_Manufacturing_Company

   Rheem is an American company that produces water heaters, boilers, and HVAC equipment. It was founded in 1925 and has expanded globally, acquiring brands such as Ruud, Raypak, and Richmond Water Heaters.

5. Heating, ventilation, and air conditioning - Wikipedia

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

   HVAC stands for heating, ventilation, and air conditioning, which is the use of various technologies to control the temperature, humidity, and purity of the air in an enclosed space. Learn about the history, functions, and types of HVAC systems, as well as their applications and benefits.

6. Forced-air - Wikipedia

   en.wikipedia.org/wiki/Forced-air

   Forced-air is a central heating system that uses air as its heat transfer medium. Learn about the different types of forced-air systems, such as natural gas, electric, heat pump, hydronic coil, and self-balancing mechanism.

7. Furnace (central heating) - Wikipedia

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

   A furnace is an appliance that generates heat for a building using various fuels. Learn about the different types, categories, and efficiency of furnaces, and how they work with air, steam, or hot water.