This is very easy but most time overlooked when thinking about why air quality is bad.
Air Filters throughout your business or Home.
This is a very overlooked task but a task that can save you $1000s. Not changing air filters are the number one cause of HVAC units going out. Personally at Stafford's Heating and Cooling we see this all to many times when going out and checking our customers businesses and homes. Some only change one air filter because they thought they only had one.
This brings me to the next point. CHECK FOR MULTIPLE PLACES WHERE A AIR FILTER MAY BE. Some business has 30+ and some houses has 2+. You will find these locations at the air handler and in the returns of your air. Changing these will be a huge headache saver in the future. Visit our article about the different types of air filters.