I live in NC and seen a new trend lately, the National home builders are building houses in my area and have several builders throwing up large square box houses(2 stories on slabs) and the Installs are terrible. Most of the HVAC co's doing them are coming from a distance and are big companies. I can't understand how there doing spider boxes' not using a duct system and just throwing flex everywhere, extremely long runs, poorly designed zone systems and continue to do them? There has got to be a ton of call backs with bad airflow and not working properly. Anybody seen this?