Here is NW Pennsylvania, many people don't even have A/C because it is fairly cool in the summers here. I am regretting now the extra expense of the 2 stage at this point. From what I calculated in energy, there is a negligable difference in the summer for having the 2nd stage. Anyhow, I lower C010 to 85 last night but haven't been home to see how it is doing. I'll keep you updated. Also, I sent an email to Steffes a few days back and haven't heard anything. Do you have a tech contact email that I could bounce some thoughts off of in the future? Thanks again.