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2. Forced-air gas - Wikipedia

   en.wikipedia.org/wiki/Forced-air_gas

   The natural gas is fed to buildings from a main gas line. The duct work supplying the hot air (and sometimes cool air if an AC unit is tied into the system) may be insulated. A thermostat starts and stops the furnace to regulate temperature. Large homes or commercial buildings may have multiple thermostats and heating zones, controlled by ...

3. Forced-air - Wikipedia

   en.wikipedia.org/wiki/Forced-air

   A forced-air central heating system is one which uses air as its heat transfer medium. These systems rely on ductwork, vents, and plenums as means of air distribution, separate from the actual heating and air conditioning systems. The return plenum carries the air from several large return grills (vents) to a central air handler for re-heating ...

4. Hart & Cooley - Wikipedia

   en.wikipedia.org/wiki/Hart_&_Cooley

   In the second half of the century, Hart & Cooley expanded into many other products lines, including Type-B vent for gas-fired appliances, all-fuel chimney systems and flexible air ducting. Hart & Cooley Inc. celebrated its centennial anniversary in June 2001, and 6 years later moved its headquarters to Grand Rapids, MI, 30 miles northeast of ...

5. 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 ...

6. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   65–97% for gas-fired heating; 80–89% for oil-fired and; 45–60% for coal-fired heating. [26] Oil storage tanks, especially underground storage tanks, can also impact the environment. Even if a building's heating system was converted from oil long ago, oil may still be impacting the environment by contaminating soil and groundwater.

7. Chicago should set limits on buildings’ greenhouse gas ...

   www.aol.com/chicago-set-limits-buildings...

   The report pointed out that installing energy-efficient windows or replacing gas furnaces with all-electric heat pumps can be “expensive and disruptive” for both large and small building owners.