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You may want to wait until Jim Pomroy gives you a definitive answer, but my Google search of your model number PH13NR036-C, shows it to be a heat pump. If your system also includes a gas furnace, it sounds like the hybrid system he mentioned. I suggest you not rush into fixing anything. It may be working normally.
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Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
Last edited by Tommy; 11-09-2010 at 07:53 PM..
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