Heating
and air conditioning systems are the biggest users of energy in
the home, up to 75% of the utility bill. A new high efficiency furnace
can save up to 50% in operating costs over a ten year old furnace.
Many 1990 and earlier model furnaces have efficiencies of 65% or
less. The minimum efficiency furnace that can be sold in the United
States today is 78%. Furnaces are available that are up to 96.6%
efficient.
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