You really need to try a few different types of bulbs to find which you prefer in different areas. The equivalent incandescent wattage is usually listed on the package. I usually move up one size from the incandescent I am replacing. Example - Replace a 50 or 60 watt incandescent with the 75 watt equivalent CFL. You can check the lumen rating on the bulbs to be sure you are getting the same amount of light and round up to the next rating. I move up a size because as CFL ages it will dim slightly and most of this dimming seem to occur in the first few hundred hours of use.
Most of the bulbs in my home are CFL or fluorescent tube fixtures. There was a noticeable reduction in the electric bill switching to CFL and fluorescent tubes. I suspect the greatest saving with CFL will be in warmer areas where the home requires more heating than cooling. Our basement has 38 recessed lights 65 watt incandescent vs. 14 watt CFL and the rooms above stay noticeable cooler with the CFLs.
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