View Full Version : DUAL FUEL with 80 or 90%
10-26-2005, 01:49 PM
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.
10-26-2005, 03:49 PM
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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