A. Treffeisen & Sons, LLC
A. Treffeisen & Sons, LLC,
204 Roundhouse Road,
Oneonta, NY 13820,

T: (607) 432-1655,
F: (607) 432-7344,

Welcome to A. Treffeisen & Sons, LLC, a third generation Plumbing, HVAC and Electrical contracting firm since 1923.

We have design-build capibility with negotiated contracts to competitive bid plan-spec work. Some of our clients include the National Baseball Hall of Fame, Kraft Foods, DMV International, Covidien, Unison, Brewery Ommegang, Amphenol Aerospace, Mallinckrodt, A.O. Fox Hospital and Tyco International.
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