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How do you measure efficiency for a heating system?

A central furnace’s efficiency is measured by annual fuel utilization efficiency (AFUE). AFUE is a measure of how efficient the furnace is in converting the energy in its fuel to heat over the course of a typical year.

  • Choosing a higher efficiency will increase the cost of your project, but will save you more on energy bills and may qualify you for a tax credit or a utility company rebate.
  • Choosing a lower efficiency will reduce the cost of your project, but will save you less on energy bills.
  • We recommend High efficiency (90 to 95%), since in our opinion it provides a good trade-off between costs and savings, but the decision is yours.
  • The following estimates* for an average U.S. home may also help you decide:

 

Heating efficiency Savings on gas costs Lifetime savings
Regular: under 90%
High: 90 to 95% 8% $1,614
Top: 95.5% 11% $2,235
Top+: 96% 12% $2,433
Top++: over 96% 13% $2,817
as you know...
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