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I know this isn't what you are asking for but this way could work as well.
If your furnace has a direct drive motor why not wire the motor so you have low speed always circulating air throughout the house? High speed would kick in when the a/c comes on. You would need a relay to so 2 speeds of the motor aren't powered at once.
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80 911 SC sold
17 Tahoe
07 Z06 Corvette
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