After getting a new air conditioner and moving it inside, the air quality improved

I don’t like the way that new houses are built in my neighborhood.

The developers get the cheapest contractors that they can find, often ones with reviews so bad that members of the public will refuse paying for their service.

You have so many things that could go wrong with the foundation alone. My friend’s house was plagued with sewer gas problems because the pipes were laid incorrectly and the concrete foundation pushed them further out of alignment as it settled in five to six years. It got so bad that the p-traps under the sinks would get pulled from insufficient air ventilation in the plumbing system. This lets sewer gases into the house from the pulled p-traps. I also hated how they installed his air conditioner upon finishing the house. They insisted on hanging it from the ceiling in the garage, in part because it’s cheaper and easier than running refrigerant and condensate lines into the heart of the house. He kept having issues with the air handler freezing up as ice would form on the coil and impede both air flow and natural defrosting effects. This pushed him to talk to a local HVAC contractor about getting a new air conditioner and finding a better location for the air handler. After getting it put into an old coat closet, the new air conditioner works much better than the old one. They have the same air cooling capacity and the same SEER value, but the new one never freezes over. All of that hot garage air is no longer affecting the energy efficiency of his HVAC system.