Breathe Easy.

As Indoor Air Quality Experts our goal is to make sure inside air is as safe to breathe as clean outside air. When the CDC confirmed that COVID-19 is an airborne virus, we set out to show how heating and cooling systems could greatly reduce the airborne concentration of viruses in buildings. Our goal as a trusted industry expert is to find solutions that will significantly reduce the virus load that individuals are exposed to indoors.

While all building systems are unique, there are a few comprehensive recommendations applicable for all buildings during COVID-19. Please contact our service team to receive your Building Confidence Report and current building recommendations.

MacMiller in the Media

Treat air quality to safeguard buildings against COVID-19

Landlords should be Proactive in Protecting Building Occupants.

Making buildings safe enough for employees and students

Areas of Focus & Recommendations


We recommend: (1) Increasing the number of air changes per hour inside the building by opening outside air intakes. (2) Checking and cleaning outside air intake grills. (3) Disabling demand-controlled ventilation. (4) Keeping system fans running longer hours to promote continuous circulation.


Studies have shown that maintaining humidity levels in a building or space above 43% cuts the ability of a virus to spread. We recommend monitoring our indoor humidity levels and adding moisture to the air if needed.


We recommend changing your air filters and consider upgrading your central air filtration to the MERV-13 or the highest compatible with the filter rack, and seal edges of the filter to limit bypass.

Learn more about Indoor Air Quality Solutions

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