I have read this forum with some interest as I live in the arid dry lands of Southern California.
I do not have central air or heating. We do have window units when needed. But I try not to use them. One thing I have done and this is by far the most important thing I've done....is I COVERED the western side of my house with plants that have covered the back section completely. There is a HUGE difference in temperature. I have a large box fan that leans against my security door (on the western side) and pulls the cooler air into the house.
This summer (for me) has been really nice and cool.
When it gets over 85 in the house I DO turn on two of the window units