Constellation is dedicated to providing commercial customers with cost-effective and energy-efficient heating and air conditioning solutions, plumbing and electrical service, and building automation. We can help you achieve the energy goals of your facility with scheduled maintenance for your mechanical systems, improved heating and cooling system efficiency, and controlled operating costs.

A Commitment to our Customers

We are committed to exceeding our customers’ expectations. This starts with our employees, who are dedicated to being the very best at what they do. Our culture creates an environment where we can focus on what matters most—delivering the best service and experience to our customers.

A Commitment to Clean Energy

We encourage the use of energy-saving products and services wherever possible. Similarly, we promote regular service and maintenance of heating and cooling systems, lighting retrofits, and building automation to help manage energy usage and improve overall equipment efficiency.

A Commitment to the Communities We Serve

We are proud to support the communities we serve by being a responsible corporate citizen. Our employees participate in a variety of community activities, including nonprofit boards, volunteer activities, and local trade associations.




MD HVAC #01-7302 MD Master Electrician #7070 MHIC #2273 MD Master Plumber/Gas Fitter #02-6739 Balto Co Master Plumber/Gas Fitter #MP-9502 WSSC #70751 MD Gas Supplier License #IR-311