Professional Affiliations & Accreditation:

The Hudson Valley Mechanical Contractors Association represents the contracting firms that install and service mechanical systems in hospitals and schools; office complexes and high-rise condominiums; superconductor clean-rooms and water filtration plants; supermarket freezers and luxury homes.

ASHRAE, founded in 1894, is a global society advancing human well-being through sustainable technology for the built environment. The Society and its members focus on building systems, energy efficiency, indoor air quality, refrigeration and sustainability within the industry.

MSCA STAR is an achievement designation for service excellence awarded to an elite group of mechanical service contractors. As an MSCA STAR certified company, we have demonstrated we offer commercial business and facilities clients unsurpassed support, quality workmanship and safe, reliable service.

We are a Participating Contractor through NYSERDA’s NYS Clean Heat Pump Program which offers incentives through rebate offers on both air and ground source heat pumps. Heat pumps provide a clean, cost-effective alternative for heating and cooling. 

Mechanical Contractors Association of America

The Mechanical Contractors Association of America (MCAA) serves the unique needs of approximately 2,600 firms involved in heating, air conditioning, refrigeration, plumbing, piping, and mechanical service.

The mission of USGBC is to transform the way buildings and communities are designed, built and operated, enabling an environmentally and socially responsible, healthy, and prosperous environment that improves the quality of life. As members, we are helping build a better, healthier and safer future. 

We are a Participating Contractor for the Con Edison Commercial & Industrial (C&I) Energy Efficiency Program. We offer incentives for installing energy-efficient electric and gas equipment and technologies. Energy efficiency can help improve the bottom line by reducing energy use and maintenance costs while increasing operating efficiencies. These upgrades can also help protect the environment.

Northeast Gas Association

We are a Licensed Master Plumber (LMP) serving Westchester County with Operator Qualification (OQ) Task 86/87 (Interior Gas Piping Safety Inspections & Above Ground Gas Piping Construction, Maintenance and Connections).

OSHA Training

Safety is our top priority. Our entire team goes through rigorous OSHA training to ensure prevention of safety and health hazards on and off the job.

The Building Owners and Managers Association of Westchester County, better know as BOMA Westchester, is the county’s leading professional organization dedicated to the needs of building owners, property managers, and trade professionals.

We are proud to be members of the Westchester County Association (WCA), which is the leading economic development and business advocacy organization serving Westchester County and the region.

Not only are we members of the Green Business Partnership (GBP) but we received our GBP Certification for our commitment to sustainability.

AIA Westchester + Hudson Valley Professional Affiliate
The American Institute of Architects Westchester + Hudson Valley Chapter, is the second largest chapter in New York State covering seven different counties. As an allied partner, we welcome the opportunity to offer our services to other members and industry partners. We believe it’s important for the design and construction industries to support each other and the communities we serve.

Licensed for Plumbing:

Westchester County
Putnam County
City of Poughkeepsie 
Town of Poughkeepsie
Rockland County


Master HVAC License:

Rockland County
Putnam County
State of Connecticut  

Union Affiliations:

UA Local 21
UA Local 638

D.P. Wolff, Inc.   l   143 Bedford Road   l   Katonah, NY 10536   l   (914) 767-0515   l   (914) 767-3596 fax   l
24-HOUR EMERGENCY SERVICE (914) 767-0515

D.P. Wolff, Inc.

143 Bedford Road

Katonah, NY 10536

(914) 767-0515

(914) 767-3596 fax


(914) 767-0515