This air quality is fantastic

I work in an old, brick building that is in need of updates. The windows are single pane and a lot of them are painted shut. The sun beats in and heats the house in the summer, and yet no clean air can be circulated through. They also allow heat to escape and cold drafts to enter in the winter time. The ceilings are especially high, and without fans, the warmth rises up and is wasted. The HVAC system installed within the building is positively ancient and cannot match demand. Between insufficient airflow and no proper insulation and weatherproofing, my heating and cooling system runs constantly but can’t provide comfort. In addition, the supply vents are based in the floor, which is useless. The most concerning issue is the problems with mold growth. The building is too moist, and the HVAC system does not provide proper air circulation, ventilation, or filtration. I am suspicious that this HVAC system is actually the main problem, and is polluting my air quality, every time it runs. Regardless of the work the cleaners do each night, there is a lot of dust on all surfaces, particles flying around in the air, and spots on the windows. There are two possible reasons. Either the cleaning crew is bad, or contaminants are being introduced into breathing air every day. Since employees are constantly sick and missing work, I am convinced that the quality of air inside the building is very poor. Unfortunately, management refuses to buy new HVAC equipment because the prevailing system still functions.

HVAC unit