Joseph Frederick & Sons
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Claim This BusinessAbout Joseph Frederick & Sons
Joseph Frederick & Sons has served Wilmington and the broader Delaware community for decades as a family-owned heating, cooling, plumbing, and electrical contractor. The business holds strong credentials with a 4.7-star rating across 158 verified customer reviews, reflecting consistent quality in both residential and commercial work. Based in Wilmington, the company extends its services to neighboring communities including Newport and surrounding New Castle County areas. Their service window runs Monday through Friday from 7:30 AM to 4:30 PM, and they maintain a dedicated filter store for ongoing customer maintenance needs.
What distinguishes Joseph Frederick & Sons from typical HVAC contractors is their breadth of trade expertise under one roof, offering not just heating and cooling but full plumbing and electrical capabilities, meaning a single phone call addresses multiple home systems. They carry premium equipment brands including Carrier, Bradford White, Generac, Honeywell, and Navien, ensuring access to manufacturer warranties and reliable equipment. The company offers a Comfort Care Membership program for ongoing preventive maintenance, and their website features a filter store for DIY part replacements. Their service menu includes specialized work such as oil-to-gas conversions, geothermal heat pump installations, and whole-house generator setups, capabilities that set them apart from smaller operations limited to basic AC repair.
Customer reviews name specific technicians who delivered exceptional service. Gabe Thomas received high praise for plumbing work including water heater installation, with customers noting his use of latest technology and clear communication via video calls. For HVAC replacement, reviewer Mike B. highlighted Dave's willingness to provide multiple equipment options and praised the install crew (Jake, Jake, and Omar) as among the most knowledgeable technicians encountered. John Marine specifically noted same-day water heater installation during what appeared to be an urgent situation, reinforcing the company's responsiveness to customer emergencies.
What Customers Say
Of 6 detailed reviews analyzed, 5 award perfect 5-star ratings citing same-day service, knowledgeable technicians who explain options clearly, and professional installation. Single 2-star review cites pricing concern ($332 for one-hour service call) and communication gap, representing the only negative feedback in the sample.
Working Hours
| Sunday | Closed |
| Monday | 7:30 AM–4:30 PM |
| Tuesday | 7:30 AM–4:30 PM |
| Wednesday | 7:30 AM–4:30 PM |
| ThursdayToday | 7:30 AM–4:30 PM |
| Friday | 7:30 AM–4:30 PM |
| Saturday | Closed |
Services
AC Installation & Replacement
Full air conditioning system installation including new construction and replacement of aging units.
AC Repair & Maintenance
Diagnostics, refrigerant service, and preventive tune-ups to maintain system efficiency.
Heating Systems
Gas furnaces, oil furnaces, heat pumps, geothermal systems, and dual-fuel configurations.
Water Heater Services
Installation and repair of traditional and tankless water heaters including Bradford White and Navien units.
Plumbing Repairs & Repiping
Leak detection, pipe repairs, drain cleaning, water line replacement, and whole-home repiping.
Electrical Panel & Generator
Panel upgrades, whole-house generator installation, EV charging stations, and surge protection.
Indoor Air Quality
Whole-house dehumidifiers, ventilation systems, and water filtration including reverse osmosis.