Furnaces and Air Conditioners

Is it time to replace your furnace or air conditioner? A variety of new equipment options can offer you increased comfort and cut your heating bill.

Energy-saving potential

  • Older furnaces are frequently around 60% Annual Fuel Utilization Efficiency (AFUE).
  • Older furnaces waste 40 cents of every heating dollar.
  • A 90% AFUE furnace saves about one-third of your heating costs.
  • An 80% AFUE furnace saves about one-fourth of your heating costs.
Current Annual Heating Cost 80% AFUE
New Furnace Savings
90% AFUE
New Furnace Savings
$350 $88 $124
$500 $125 $177
$650 $163 $231
$800 $200 $284
$950 $238 $337
$1,110 $275 $390

Estimated annual savings from improved furnace efficiency assumes existing furnace efficiency of 60%.

Note: If you have natural gas appliances such as a water heater, dryer or stove, be sure to subtract that use when calculating your home heating costs. Your summer gas use is a fair approximation of your nonhome heating gas use.

For example, if your average summer gas use costs $14 per month, multiply this by 12 to find your nonheating gas use for the year.

Subtract this amount from your total 12-month gas bill to find your annual heating cost.

Example:
$14/month x 12 months = $168 non-home heating gas use
Total gas use for the year = $750
$750 - $168 = $582 annual heating cost

Look up and compare your past energy useMy Energy Use - Look up and compare your past energy use

MGE brochures

Furnaces Brochure [883 kB PDF]
Air Conditioners [829 kB PDF]
Energy-Saving Checklist - A Guide for Homeowners [711 kB PDF]

Efficiency incentives

Focus on Energy offers Cash-Back Rewards for:

  • Furnaces with a 95% AFUE or greater and an efficient fan motor.
  • Boilers with 95% AFUE.

For details, call 1-800-762-70771-800-762-7077 or visit Focus on Energy.

Government and consumer sites

EPA ENERGY STAR Heating and Cooling Equipment
Consumer Reports online
How Air Conditioners Work

Heating and cooling equipment manufacturers

Use dealer locators on manufacturers' Web sites to find local heating and cooling contractors.

Heating and cooling Boilers

Amana
American Standard
Armstrong
Bryant
Carrier
Comfortmaker
Heil
Janitrol/Goodman Co.

Lennox
Luxaire
Maytag
Rheem
Ruud
Tempstar
Trane

Buderus
Burnham
Lennox
Munchkin
Weil-McLain