What is a 90% Furnace?

90% Furnace

The most efficient gas furnace on the market is one that has an A.F.U.E (Annual Fuel Utilization Efficiency) of 90% or higher. For every dollar spent on your heating bill, between 90-98 cents actually heats your home and only 2-8 cents are lost to your chimney. Compare that to older units where you may lose up to 50% of your heating bill to chimney loss. Some states already mandate 90% efficiency for new installations and plans are in place for national compliance in the near future.

The most popular 90% furnaces are:

  • 95% Efficiency – This unit maximizes the efficiency for the best price and it qualifies for gas company rebates. All 90% furnaces have two heat exchangers and are vented out the side wall with PVC piping.
  • 96% Two Stage – This unit increases your comfort level by having a low and high burner setting along with a variable speed blower that can save over 50% on electric usage.
  • Modulating Furnace – This unit maximizes the efficiency of any furnace with 98% but more important it gives you the most comfortable home possible. It maintains a constant temperature and eliminates any variances on your thermostat. Not only is this the most efficient and comfortable unit available, but it is also the quietest. If you are considering a new furnace you can see this one in operation in our Crystal Lake office.

90% furnace - hvac sales crystal lake il


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