Johnstone Supply – Dover, DE

For reliable HVAC services in Dover, Johnstone Supply offers expert installation and repair. We install and repair heating and cooling systems including furnaces, air conditioners, heat pumps, and ductless mini-splits. Our technicians are trained to work on all major brands and can help improve your home's comfort and energy efficiency. Our commitment to quality ensures you receive the best products and service. We serve Dover and the surrounding Delaware area. Customer reviews highlight our commitment to quality. We maintain a 4.2-star rating based on 12 reviews. Call (302) 883-6300 to speak with our team or schedule an appointment.