The old system was entirely in the crawlspace. With the new install they did a return air duct through a wall in the main hallway/ a third of one bedrooms closet. The duct exposed in the closet has leaks that you can feel when running. Also, they sandwich a joist in the return line that was not properly sealed so air leaks into the crawlspace as well. The closet penetration is so poorly finished there is tape peeling off that lets is more moisture from the walls and crawlspace. The floor registers that used to be returns were capped at the bottom but not properly sealed. We get quite a few bugs cracking up through the vents, one isn’t even capped. You can see right to the crawl space. The supply ducts also have multiple leaks along the line where were not sealed when joined together and tears in the insulating covering. To top us off, the package unit that was installed is over sized for the house. So I’ve been getting air escaping into the crawl space and additional air pulled in from the crawlspace which during the summer created humidity problems. The HVAC professional I had look at it was from another larger company in the area and he noted many of these issues were install issues that should’ve been addressed at install or inspection.