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I forgot to mention there is also the possibility of blockage. On ours there are four screws buried in the carpet on the step to upstairs. Find (not easy) and remove those screws. Underneath is the junction box with two hoses exiting to the upstairs duct. You could remove the ducts to check for blockage there. On our 2880RL we had more heat in the bath area than the bedroom area. Reversing those hoses in the junction box helped quite a bit. We still would need an electric heater upstairs in really cold weather, though.
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