1. Remove the light shade(s) on your old ceiling fan by removing the screws holding it/them in place.
2. Remove each blade by removing the screws holding them in place.
3. Remove the canopy by removing the screws holding it in place. Slide it down.
4. Disconnect all of the wires coming from the old fan.
5. Remove the mounting bracket by removing the screws holding it in place.
6. Secure the new mounting bracket in place with the new screws.
7. Connect the new wires and secure them with wire nuts. If there is a remote control, connect it now. Put batteries in the remote control.
8. Put the rod and/or canopy on the fan. Slide it up to the mounting bracket.
9. Cut the lead wires as needed. Slide the canopy up to the ceiling and secure it with the new screws.
10. Put each blade onto the blade brackets with the included screws.
11. Put each blade bracket onto the fan with the included screws.
12. Connect the light kit and secure it with the screws. Put the glass on and secure it with the included screws.
13. If not using a light kit, connect both the fan and light wires together and put the light cap on. Secure it with screws.
14. Attach the included pull chains, if applicable.
15. Turn on your new fan!

These recommendations depend actually on the height and size of the room; the season; and the activity taking place in the room.

The basic fact of nature is that warm air rises to the top and cold air settles on the bottom. Air settles in layers from warm at the top to cold at the bottom, if left alone at equilibrium.

Ceiling fan recommendations:

In the winter
Set the fan to run counterclockwise (reverse; this looks clockwise as you are looking up). This will redirect the warm air from the ceiling and down the walls and into the living space where the people actually are. In a house, you would run the fan at a low speed so that you don’t actually cool the warm air that you are moving downward. If you have a high ceiling, or are trying to heat a hall or a church, you may want to increase the fan speed so that the warm air will reach the living space as long as the fan speed does not create an unwanted downdraft at the people below.

In the summer
In a room of normal height (8 – 10 ft), you should operate your fan so that it turns clockwise (this looks counterclockwise as you are looking up), causing a more directed downdraft, especially with the fan running slightly faster. This causes a wind-chill effect because the skin evaporates slight amounts of water from the sweat glands and thereby provides cooling through the skin’s surface. However, the air is only moved but not cooled! You may find that you can turn your thermostat down a degree or two and save more money on energy costs. The air blowing down won’t actually cool the room though, so you should turn the fan off when there are no people (or animals) in the room.

In a high hall or church
It may be best NOT to run the fans at all in summer. This lowers the demand for cooling since the hot layer on top is an excellent insulation between the cool air near the floor (and the people) and the hot roof and outside.

A large, tall manufacturing hall would typically have different goals. There one would have a floor full of heat producing machinery plus the people operating it, working hard and welcoming a bit of a breeze. Then it would make sense to run the fans at fairly high speed to create a certain and directed downdraft. And with the shifts going throughout the days of the week, the fans should be running all the time and maybe in all seasons.

Finally, fans typically use 80-100 watts. When used properly, ceiling fans can really help to optimize the comfort level of the people and save energy and money.

Source: WikiAnswers