Fordguy64
If your only using 190 ccf of ng at .55 per ccf thats about $104.00 per month. Not bad. If you electric costs are 0.22 /kwh I think it will cost you more for running a heat pump. My GSHP thats heating my shop 1600 sf. is costing about 135.00/month @0.15/kwh Maybe your best bet is a new high efficiency gas furnace. My friend had the same issue. Her furnace was a 22 yr old gas that no parts where avalible any longer. She installed a new HE gas furnace with a central air unit and cut here usage in half.
Randen
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