15 years ago we put an addition on and wanted to add central air to our existing house also. Shipley was the contractor who came up with a good way to have A/C in both the old section and new section. I had four estimates from 4 contractors and Shipley had the best solution for an installation which was problematic to design. The installation went well and the Trane system has worked without a problem of any kind for 15 years and it is efficient.