u/99Red_Balloons

I bought a DSLD house with a deffective HVAC system resulting in uneaven heating and high humidity with a lot of mold growth. A 3rd party HVAC told me the ducts were sized too small among other things (this makes sense the front rooms were always a lot warmer). 3rd party company quoted me 16k and told me its unlikely they the original builders will do anything to help.

I called DSLD and they directed me to their installer company, Bell Mechanical Services. Bell Mechanical Services said they will send a send a technician to review BUT if the house was built to code there will be no help. Any advice on dealing with this? Should I just bite the bullet and get the 3rd party to fix it?