Concentrations and detection frequencies (DFs) of neutral PFAS with DF >50%, with the PFAS concentrations in heating and air conditioning (HAC) filters, particle-phase samples, and gas-phase samples expressed in different units for better comparison. Associated study parameters and analytical QC results. This dataset is associated with the following publication: Eichler, C., N. Chang, D. Amparo, E. Cohen-Hubal, J. Surratt, G. Morrison, and B. Turpin. Partitioning of neutral PFAS in homes and release to the outdoor environment: Results from the IPA Campaign. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, USA, 58(42): 18870–18880, (2024).