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Donnelly Mechanical is one of the largest HVAC contractors in the New York City metro area. Donnelly’s strengths: 1. It is deeply involved 24/7/365 in everything it does (design, construction, service and maintenance). 2. In regards to energy, it keeps its clients “ahead of the curve of coming legislation and mandates.” We summed this up in the positioning Hands-On Today, Eyes On Tomorrow. Now expressed in all interactions with clients and prospects, this positioning helps Donnelly thrive.