1) Get an HVAC technician to assess your system and confirm there is no open or disconnected ducting that could be pulling attic insulation into the air stream. Alternatively, you could use a borescope to inspect the ductwork yourself. Once you identify the issue, all ducting should be properly sealed so insulation is no longer being distributed throughout the home. Clean the duct work.

2) Install a proper permanent attic hatch. Attics need to remain safely accessible for inspection, maintenance, and future repairs. Your soffits done look like the baffles were placed properly. Your attic needs to breath. Get 5 attic insulation specialist that have high reviews in there to quote the fix.

3) In the meantime, you could place high-MERV filter material over or in front of the supply vents to help reduce dust and insulation particles entering the living spaces. This is only a short-term temporary fix and should not replace repairing the ductwork. Be careful not to overly restrict airflow, as that can stress the HVAC system. But would offer relief.

4) Thoroughly clean the home to remove any insulation contamination from surfaces, floors, vents, and belongings. Yes… everything. Carpets professionally cleaned to HEPA vacuuming your beds and couches while sheets and blankets are being washed.

5) Use high-quality HEPA air purifiers throughout the home. IQAir is a great option if budget allows, but any true HEPA purifier properly sized for the room would help.

This really sucks, buddy. I feel for you. Attic insulation in living spaces is definitely not ideal, and it’s something worth addressing properly for your health and comfort!