Natural Gas and Oil Furnaces  Oil & Gas Furnaces  What are Oil
and Gas Furnaces?  Furnaces are the most commonly used
residential heating system in the U.S. Running most often on
gas, but sometimes on oil, propane, or electricity, furnaces
deliver their heat through a duct system. Combustion furnaces
always need to be vented to the outside. Traditionally, this was
through a chimney, which tends to expel heat along with the
exhaust. Modern high-efficiency furnaces can be 96% efficient
and operate without a chimney. The small amount of waste gas and
heat are mechanically ventilated through a small tube through
the side or roof of the house. Modern household furnaces are
classified as condensing or non-condensing based on their
efficiency in extracting heat from the exhaust gases. Furnaces
can typically deliver heating savings of 20%-35% assuming the
old furnace was in the 60% Annual Fuel Utilization Efficiency
(AFUE) range.  ACWholesalers is your one-stop for home comfort
products, Heating, Ventilation, Air Con