Historic New England owns and operates thirty-eight historic house museums from Rhode Island up to Mid-Coast Maine. The process of safely opening properties to the public across five states in the midst of the COVID-19 pandemic was challenging, to say the least. Ben Haavik, Historic New England’s team leader for property care, and Margaret Back, a preservation manager for seven of those properties, spearheaded an effort to make the visitor and staff experience as safe as possible by providing supplemental air flow and filtration at the museums. They will discuss their research, the three strategies they developed, and the results of their work.