sounds like the atwood air command.
when in AC I use auto, this way if the AC comes on and it needs a stronger fan it can auto adjust, but once AC compressor shuts off it goes back to low.
in Heat (heat pump) it actually cycles the fan on and off, which at night some feel is worse than a fully running fan because of one solid unchanging nose, you have a fan cycling. but you get used to it.
than when in gas heat mode it uses a thermometer in the thermostat and only runs the gas heater, which as a fan that turns on based on heater temps.
no way to change it because this is how its designed.
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