We had a similar issue with our Lantana - only the problem room was the front BR. During the summer it was too warm and during the winer it is cold. We were given the same story (some difference in temperature is to be expected.) They wanted to leave it at that, claiming that it was within the specs, but we persisted, so they finally came back out and worked on the system. It seemed to help a little during the summer, but now that it is cold outside, the front room is noticeably colder than the back of the house (although that may have something to do with its northerly exposure.)
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