I’m using tons of cooling fans

My rental home has tons of ceiling fans. I don’t understand why there are a lot of ceiling fans. The HVAC unit in the house is great. The heating and cooling device uses ductwork in order to make the whole house one centralized temperature. I adjust the thermostat in the hallway and the house is either heated or cooled. It works great and I never want to turn on the fans. The idea is that ceiling fans can work instead of HVAC. In the Summer the fans turn a direction to suck up the head air. They put the heated air to the ceiling and push the cold air down. In the Winter, the reverse direction is used. This actually can be used with the heater. The heater turns on and the fans keep the heated air down on the ground level. The cool air is then on the ceiling. My HVAC does not need this extra boost. The fans are literally pointless. All they seem to do is collect dust. Once every two weeks I have to get out a ladder and clean them. I have to wipe down each individual fan blade and the light. The reason I do this is because of air quality issues. I think that when the air comes out of my ductwork, the dust on the fan blades circulate. I don’t want to have dusty indoor air conditions. Also, people who come over love to turn on the fans. I don’t want gobs of dust floating off the blades. That would be super disgusting.

indoor air quality