I'm the guy with the appalling workmanship system and they are coming out to fix the problems on July 9th. I have a concern that the system may be oversized since it cycles on an off sometimes every 15 mins or so. The house gets down to the set temp but it still seems humid. A humidity gauge in the house was around 70% when the outside humidity was between 85-90%. I have a supply outlet going down to the finished basement but no return. If a return was added from the basement would that additional hot and humid air entering the system cause it to run longer and help with the possibility that the system is oversized.
The basement size was not included in the measurements the guy took to determine the system requirements. I'd also like to add another supply to the basement but that's another story.
Thanks again for your help.