in fan only cycle there is a high and low, but the difference is very small. You can have the fan running all the time in a/c mode, however in heat mode the fan comes on only when the heater is on. It is a different fan, blowing air in low wall mounted or floor vents.
2012 Toyota Tundra 5.7 Litre DoubleCab
6 speed, 4.30 Limited Slip, Tow Package
2013 Jayco White Hawk 27DSRL
2010 Jayco JayFlight 26BH sold
Yamaha EF2000is Generators (2)
1996 Honda CB750 Nighthawk