Green Bay & Brown County: (920) 468-6951  |   Oshkosh & Winnebago County: (920) 235-6951  |   Fond du Lac & Fond du Lac County: (920) 923-2500

Understanding Furnace and Boiler Efficiency Ratings

Green Bay & Brown County: (920) 468-6951
Oshkosh & Winnebago County: (920) 235-6951
Fond du Lac & Fond du Lac County: (920) 923-2500

Understanding Furnace and Boiler Efficiency Ratings

Understanding the Efficiency Rating of Furnaces & Boilers

A central furnace or boiler's efficiency is measured by annual fuel utilization efficiency (AFUE). AFUE is a measure of how efficient the appliance is in using electricity or fossil fuels (oil or gas) over the course of a typical year.

An all-electric furnace or boiler has no flue loss through a chimney. The AFUE rating for an all-electric furnace or boiler is between 95% and 100%. The lower values are for units installed outdoors because they have greater jacket heat loss. However, despite their high efficiency, the higher cost of electricity in most parts of the country makes all-electric furnaces or boilers an uneconomic choice. If you are interested in electric heating, you might consider installing a heat-pump system.

The minimum allowed AFUE rating for a noncondensing fossil-fueled, warm-air furnace is 78%; the minimum rating for a fossil-fueled boiler is 80%; and the minimum rating for a gas-fueled steam boiler is 75%. A condensing furnace or boiler condenses the water vapor produced in the combustion process and uses the heat from this condensation. The AFUE rating for a condensing unit can be much higher (by more than 10 percentage points) than a noncondensing furnace. Although a condensing unit costs more than a noncondensing unit, the condensing unit can save you money in fuel costs over the 15 to 20-year life of the unit.

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Contact Information
 
Green Bay Location
Address:  1736 Sal St.
Green Bay, WI 54302
Phone:     (920) 468-6951
 
Oshkosh Location
Address:  3250A Walter St.
Oshkosh, WI 54901
Phone:     (920) 235-6951
 
Fond du Lac Location
Address:  160 South Brooke St.
Fond du Lac, WI 54935
Phone:     (920) 923-2500
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Office Hours
 
Green Bay:       MON - FRI   |   7:00am - 6:00pm
Saturday by Appointment
Oshkosh:          MON - FRI   |   8:00am - 4:30pm
Fond Du Lac:    MON - FRI   |   8:00am - 4:30pm
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For AC in Green Bay WI, we accept most major credit cards.
 
We accept cash for Cooling repair service provided in Oshkosh WI.&width=100
We accept check for Air Conditioner repair service provided in Fond du Lac WI.&width=100
 
For AC in Green Bay WI, we accept most major credit cards.
We accept cash for Cooling repair service provided in Oshkosh WI.
We accept check for Air Conditioner repair service provided in Fond du Lac WI.
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