B&B Air Conditioning & Heating Service

B&B Air Conditioning & Heating Service is a residential and light commercial HVAC company with offices in Columbia/Elkridge, Rockville, Frederick, Annapolis, Gaithersburg and in northern Virginia, covering Maryland, Virginia and Washington, DC. Work spans oil and gas furnaces, oil and gas boilers and hydronic systems, heat pump heating and cooling, ductless mini-split systems, geothermal cooling, central air, ductwork installation and repair, indoor air quality, water heaters and generators. Service plans and financing are offered, a 24/7 emergency line is staffed, and installations carry a two-year warranty with a complimentary service-maintenance agreement. The company runs its own training institute, founded in 1991 around heat pump technology. Hours are Monday to Friday 7:30am to 5:30pm and Saturday 8:00am to 1:00pm, and service can be booked online by zip code. Rated 4.9 from 836 Google reviews, 813 of them five stars.