Delivering Comfort with Care to Southern Maryland Homes & Businesses Since 1987

• Heating & Cooling Installation & Repair

• Indoor Air Quality

• Plumbing Service/Repair

• Duct Fabrication

Since 1988, Tri-County Aire has provided comfort to Southern Maryland homes and businesses through every season. Being a locally owned HVAC and plumbing business that serves Calvert, Charles, and St. Mary’s Counties — plus King George County, Virginia — we know the climate of this region, the older homes, and the families who live in these areas. Our NATE-certified technicians install, maintain, and repair all major heating and cooling systems; we offer 24/7 emergency service available every day of the year. Call 800-890-5123 or request service online.

Who We Are

Southern Maryland's Trusted HVAC Contractor
Tri-County Aire is a certified HVAC and plumbing contractor serving Southern Maryland since 1987. We serve Calvert, Charles, and St. Mary’s Counties, plus King George County, Virginia, with installation, maintenance, repair, and 24/7 emergency service. As a Trane Comfort Specialist and BBB-accredited business with over three decades in the community, we’re the HVAC company Southern Maryland residents rely on.

For over 30 years, our certified technicians have delivered quality heating and cooling service to local homes and businesses.



 We manufacture custom ductwork for all of our residential and light commercial customers.

Competitive Prices