My air conditioner has a strange chemical odor I can't pinpoint

I have only been in my new apartment for a total of six months.

After a recent divorce, I needed to downsize quickly and signed a lease for the first studio apartment I found that was within a 10 mile radius of my office.

My ex-wife and I were living together in a large three bedroom house, so I feared that the new space would feel cramped and claustrophobic. To my surprise, my new dwelling is extremely cozy and warm, reminding me of my dorm back in college that I shared with a buddy of mine. There is a gulf of time between then and now, but this series of recent changes has felt like going on reset in a sense anyway. But even so, as much as I love my new studio apartment, I always feel limited on space. This has gotten so out of hand that my storage unit is now nearly packed to the brim from housing the overflow of everything I can’t fit in my tiny apartment. I have resorted to utilizing space down to the barest inch, barely fitting a couch in between a miniature stackable refrigerator and a little table for meals. There are only two closets here, the clothes closet and the closet for the HVAC air handler. I resorted to storing my cleaning supplies and chemicals inside the air handler closet, but after I noticed a strong chemical odor permeating my apartment following work one night, I realized my mistake. I was forced to buy a cheap press board pantry that you slap together with tiny wooden pegs. It doesn’t look fantastic, but it will prevent the odors from the chemicals and mops from getting circulated through my air conditioning system. Eventually the odor seeps into the filter, shortening its life before I have to buy a new one.

Cooling system