The Chester County Historical Society (CCHS) wants area residents to know that the large crane that can be seen in Evans Alley hoisting materials onto its roof is a positive sign.

The West Chester-based nonprofit is in the middle of a major HVAC replacement project, a news release said. Coordinated by Brandywine Valley Heating and Air Conditioning, CCHS is replacing its aged cooling system with a brand new chiller and controls. This will not only ensure a continuation of the society’s mission to preserve the county’s historical treasures, but it will also add environmentally friendly efficiencies that will save fuel and maintenance costs, the release said.

The release extended thanks to the Longwood Foundation for funding a major portion of the project. CCHS has also recently received generous grants from the Crystal Trust, Welfare Foundation, and Pennsylvania Historical and Museum Commission toward roofing projects. Additional changes will occur as CCHS implements its state Redevelopment Assistance Capital Improvement grant of $750,000 later this year, according to the release.