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  1. #1
    Join Date
    Jan 2004
    Posts
    933
    In a dual fuel setup HP with gas backup, I would tend to think that a 80% furnace would be the best route to offset the high cost of the HP. which do you recommend and why, my climate is so. indiana.
    Still learning opinions welcome.

  2. #2
    Join Date
    Apr 2004
    Posts
    7,680
    Well if you have any cooling load, you can be rest assured that your SEER will lose about a point when on a 90 versus an 80 because of the secondayr HX. And that can also affect the HSPF. If it were me, an 80+ with VS would be ideal.

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