When you have several people living in a single house, zone control is necessary; Everybody has an opinion if the heating system or air conditioner should be on.
Everybody has a thermostat setting they care about best.
I used to attempt to get the household to agree on a single temperature. It was a nightmare. My father has terrible circulation and always wanted the heating system on, even in the summer. My son works out in the house and constantly was turning the A/C on and leaving it. My husband prefered to have no Heating as well as Air Conditioning whatsoever since he did not care about air hitting him. It was constant fights and thermostat changes. My central Heating as well as Air Conditioning system finally died and I got it updated with a ductless model. There is a single outdoor air compressor. Inside, every room in the house has an indoor air handler and thermostat. Each room of the house can set the heating and air and not affect the other a single. This is Heating as well as Air Conditioning zone control. It is good for our family since they each can have their rooms to what they want. The community areas care about the entryway, entryway and office are controlled by whoever is in the room most. I think because everybody has their own space with perfect climate control, every one of us are all a bit more lenient! Since the thermostats are basically kept at the same temperature for each room, the bills are lower than before. There is no cycling on and off several times a day. I also save money not providing Heating as well as Air Conditioning in rooms that are not used or used by our husband.