Star Group, L.P. operates as a full-service energy provider and is recognized as the largest retail distributor of home heating oil in the United States. Operating primarily across the Northeast and Mid-Atlantic regions, the company specializes in selling home heating oil, propane, diesel fuel, and gasoline to residential and commercial customers. In addition to fuel distribution, it installs, maintains, and repairs heating and air conditioning equipment, and provides residential plumbing services in select operating markets.