William G. Day Company

William G. Day Company has operated as a plumbing, heating and air conditioning contractor in New Castle County, Delaware since 1977, building over four decades of hands-on experience in residential and commercial system work. The company holds NATE certification for its technicians and maintains a 4.2-star average across 28 customer reviews. Based in Wilmington, the business serves Hockessin and Newark alongside the surrounding Delaware communities, operating Monday through Friday from 7 AM to 4 PM. Homeowners can reach the office directly at (302) 427-3700 to request same-day service for heating or cooling emergencies.

What distinguishes William G. Day Company from other contractors in the area is their dual-trade expertise handling both plumbing and HVAC systems under one roof, along with their status as a Carrier dealer offering Infinity system installations. The company promotes financing options for customers who need new equipment but prefer to spread costs over time. Their technicians receive ongoing training on evolving HVAC technologies, and the business emphasizes honest pricing and transparent communication as core operating principles. This combination of manufacturer partnerships and customer-focused business practices has earned the company repeat business from area residents.

Customer reviews name specific technicians and describe precise service scenarios. One homeowner stranded without heat during single-digit temperatures credited tech Tom with thorough diagnostics and a Same-Day repair that restored warmth quickly and affordably. Another review recounts tech Chris arriving the day after a storm at the promised time to repair a heater, with parts ordered on the spot. A third reviewer noted Toby as the point of contact for a new Carrier Infinity AC installation, highlighting responsive communication throughout the project. These named technician experiences illustrate the company's capacity for responsive emergency service alongside planned installations.