We keep all lights off unless we just have to have them on--this also eliminates another heat source in the house. In the evening we often go outside to water by hand and work in the yard (what's left of it!), so we turn all lights off. When we come in we only turn on lights in the rooms we are using. As I mentioned several weeks ago, I hang my clothes outside to dry (faster than my dryer in 105 degree temperature!). I wash dishes by hand unless we have company, I have unplugged all unnecessary appliances around the house, and I have turned the a/c thermostat up a couple of degrees.
Hopefully our electricity bill will reflect my more frugal habits and help balance the a/c usage. We are praying for a few cooler days and some blessed rain!!