Using a fan while using the air conditioner will save you money on your electric bill. Yes, using them both will keep you cooler and use less energy than using just one. It is like fighting high electric bills with a one two punch.
Use the air conditioner to cut the humidity and cool just a little.
Set your thermostat at 78 degrees so that that you air conditioner will run just enough remove moisture from the air. On hot days, the 78-degree setting will cool the house just a little while keeping the humidity down so the air feels cooler.
Use fans to cool people by wind chill.
When we feel a breeze, we feel cooler because our natural cooling system works faster. Wind blowing cool dry air at us evaporates our sweat faster and removes excess body heat making us feel better.
The wind does not actually make it any cooler it just makes humans and pets feel cooler. We can make our own wind chill by using electric fans to make the wind for us.
For a fan to work its magic, we need to feel the air move.
Ceiling fans should blow the air down directly at someone. Other fans should be aimed right at a person to be effective.
Fans do use energy and the fan motor actually adds heat into the room, but the cool feeling that they provide outweighs the cost.
The savings comes from keeping the actual temperature fairly high at 78 while feeling cool due to the wind the fan makes.
Shut the fan off when no one is there.
When there is no one there to feel it there is no benefit to running a fan. A fan running in an empty room does no good and it costs money on the electric bill.
Fans work like lights. When you leave a light on in an empty room, it cost money and adds heat to the room. Same thing with a fan. A fan running in an empty room moves the air but it wastes money because no one feels it.
When you leave a room shut off the lights and fans to save energy.
If you will be away from home for more than one hour, shut the air conditioner off to save money. Leaving an air conditioner running in an empty home is a waste of energy.