When you want to install a ceiling fan in a room, you'll find a dazzling array of styles, shapes and sizes sold at lighting retailers and home centers. Before you choose a fan, measure the room's length, width and ceiling height. Those dimensions will help you select the correct size fan that will do the best job of cooling the room.

According to the Alliance to Save Energy (http://www.ase.org), a ceiling fan will reduce your energy bills by providing additional cooling and better circulation so you can cut down air conditioning costs. When you're looking at fans, choose one that's Energy Star-certified because it'll move air up to 20 percent more efficiently than a conventional model.

An electrician will charge $238 to install a moderately priced 52-inch fan in a room with an existing overhead light fixture in the correct position. If the electrical box is not designed to support a fan you must install a fan bracket that is secured to the ceiling joists. Assuming you have experience with electrical projects, you can buy the fan and bracket for $165 and install it yourself, saving 31 percent.

However, if there is no overhead light fixture you need an electrician to run a new electrical line, not a job for a do-it-yourselfer.

To find more DIY project costs, and to post comments and questions, visit http://www.diyornot.com and http://www.m.diyornot.com on smartphones.

Pro Cost -- DIY Cost -- Pro time -- DIY Time -- DIY Savings -- Percent Saved

$238 -- $165 -- 1.5 -- 4.0 -- $73 -- 31 Percent