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I don't know about residential A/C, but in automotive systems a temperature differential of 30 degrees is the benchmark for an efficiently working system. Rich's system hit that mark 93 outside and 62 outlet temperature inside. Rich and Helen's is not the darkest color combination on a Big Sky, but I think the A/c is doing what is expected of it. The only way to get more out of the units is to install higher BTU units-that means more money. Just my opinion, but sometimes I think we expect more than we should out of our rigs. They are tested for average conditions and short term extreme ones. The heat wave many of us are experiencing is neither of those. Rich, you gathered some great information there. You prepared yourself with pertinent information to call Keystone with.
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