Frank Cullen Inc.

Frank Cullen Inc. has served Loudoun County heating and cooling customers from Sterling since 1986, with more than 30 years of experience behind its technicians. It sells and services all makes, models and types of systems, from AC repair, tune-ups, replacement and installation to heating repair, replacement and installation. Carrier is its featured line, including Infinity heat pumps, air conditioners and gas furnaces, and it installs WaterFurnace geothermal systems, with high efficiency upgrades and custom systems for additions or remodeling. A Homerun Service Agreement maintenance program keeps systems at peak efficiency on the hottest and coldest days. Indoor air quality work covers humidifiers, air purification, programmable thermostats and duct cleaning. Technicians handle both homes and businesses. Rated 4.9 from 54 Google reviews, 52 of them five stars.