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When I put the thermostat to "Fan On" mode, it runs at the lower speed. Is there a way to ask RTH7600D to run the Heil furnace fan at higher speed without turning on the AC? I wanted to just mix the air insider the home without turning on the AC as my basement is at least around 10-15 degrees cooler than the upstairs.

On a side note, is there a better way to transfer the coolness from basement to upstairs?
 

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Does the blower motor is running with the same speed in cooling mode and fan on?
 

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I believe on your furnace model, it only runs the blower at 50% in fan on mode.
 
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