Pick the CFL bulb with the same Lumens (Light output) as the one you are replacing.

For CFLs that look closer in color to incandescents look for "warm white," with a color temperature between 2650 and 2850 degrees Kelvin.

For dimmers check that the CFL says it is dimmable.

CFLs work best in open fixtures that have airflow.

REMEMBER: CFLs contain up to 4mg of mercury which means that you should not vacuum a broken bulb. Instead open a window and wipe clean with a disposable wipe. By comparison, a medical thermometer has 500mg of mercury. Tooth fillings that contain mercury will contain an average of 800 mg per filling.

Compact Flourescent Lamps (CFLs) use up to 80% less energy than old-fashioned incandescents.

CFLs last 10 to 12 times longer than incandescents.

Incandescents waste 90% of their energy creating heat instead of light.

Using a 100W incandescent light bulb for just 30 minutes creates enough CO2 to fill a balloon

By switching to CFLs, your AC won't have to compete with the heat generated by incandescents, thereby reducing need and cost of cooling.