5 of New Castle County's 81 plumbers and heating and cooling contractors are listed for AC and heat pump installation.
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A contractor is listed for a service when its owner picked the service, when its Google Business Profile category names it, or when its business name does. Ranked as on the county page: verified owner, then a Google rating of 4.0 or higher, then review count, then fleet size. How ranking works
Ranges are national; ask contractors near you.
Figures checked September 2026.
Delaware licenses master plumbers individually through its plumbing and HVACR examiners board.1, 2, 3 Heating and cooling contractors in Delaware hold a Master HVACR license, for the full trade or restricted to one specialty.4 Replacing an existing water heater in Delaware needs no permit or fee from the state's Division of Public Health.5
