LCDs use less energy than CRT

I'd say that depends. The power usage of LCD TVs vary greatly. I've seen many with far higher wattage than regular CRTs. This is especially true for the larger-size and higher-resolution LCDs. So if you go from say a regular 28" or 32" widesscreen CRT to a 40" LCD (a common switch nowadays) you are quite likely to increase your power bill, not decrease it. Especially if you don't look at the specs before you buy.