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The tech, a real wiz in Saratoga Springs NY. Checked the air flow, not just the temp of air. Said it was not sufficient. Never saw reading myself, but felt like he knew that even if it was, itcwasnt cutting it. It seems that during construction the ducts were crushed enough to limit air flow in all but one duct. Keystones "fix" was to put clear sturdy hot tub hose in there to open it up. Hose was standard size I've seen on our hot tub but don't know actual dimensions. Probably, 2-2 1/2" my husband guesses. He carefully stuck about 3' in each vent using his hand and the length of his arm to make sure it went in smoothly. It's worked fine on "high" when it's 85 degrees and more and "auto when lower temps outside. Has a differential step down of 15-20 degrees. I think if we weren't under warrenty and knew about this we could have done it ourselves.
Also, need to mention, without any equipment I could tell the air coming from the vents was not forceful enough.
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