Tri-County Aire

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HVAC Contractor-Leonardtown, MD

Heating & Air Conditioning Installation & Repair

The HVAC system in most Leonardtown homes consists of a gas or oil furnace and a separate air conditioner. This is to take advantage of the large efficiency gains and cost savings fuel based heat has over electric heat. In addition, a standalone air conditioner operates slightly more efficiently than a heat pump system in cooling mode. In some older homes, a permanent air conditioning system may not have been installed.

Tri-County Aire has served the southern Maryland area for over 30 years. If you’ve decided it’s time to install an air conditioner in a home without one, you can rely on our decades of experience installing ACs in Maryland’s older homes. We also replace existing air conditioners and furnaces when it’s time for a newer, more energy efficient model. If it’s not quite time for a new unit, we offer preventative maintenance plans to help keep your unit running at maximum efficiency and to detect problems early on when they are cheaper to fix. We also offer emergency service when needed — just fill out our online form or give us a call.


About Leonardtown, Maryland

Leonardtown is a 3.25 square-mile town in south-central Maryland and is the county seat of St. Mary’s County. It is near the Washington, D.C. metro area and the Patuxent River Naval Air Station. The town has a population of just under 3,000.


During the late 1700s, residents of the area known as Newtown began holding a county court in various homes. In 1708, a designated courthouse was established when 50 acres were set aside for the town, and the town’s name was changed to Seymour Town in honor of Maryland Governor John Seymour. 20 years later, Benedict Leonard Calvert became governor of Maryland, and the town was renamed to Leonardtown.

The town’s economy was crippled when the British blockaded Chesapeake Bay during the War of 1812. It was also subject to pillaging by British troops. By 1860, the town had rebuilt to include two hotels, multiple stores, and 35 homes within its limits. It was also a key landing during the steamboat era. Today, Leonardtown is the only municipality in St. Mary’s County to have its own town council and mayor.

Things to Do

The Port of Leonardtown Public Park is the beginning of a three-mile canoe and kayak trail that is home to many native bird species. Boat rentals and shuttle services are available from private companies. The Port of Leonardtown Winery allows local farmers to join a co-op that grows grapes to produce local wines. Leonardtown also publishes a walking tour that circles around the town and stops at 21 historic locations.


Leonardtown’s 3,000 residents live in about 1,000 households, and there is an average household size of about 2.65 people. Just under half of the population is married, and the median age is 40.8. Roughly half of its households own their own home and about half rent. The median home cost is $306,500. Leonardtown is a relatively wealthy city with a median household income of $77,426. Less than 13% of its households earn $25,000 per year or less.


Leonardtown sees dramatic shifts in the weather with the seasons. Summer highs approach 90 degrees and winter lows are regularly below freezing. The city sees three to four inches of rain throughout the year for an annual total of about 43 inches spread over 101 days with rain. The average annual snowfall is about 11 inches. There are about 205 sunny days per year.

Local Events and Popular Attractions

There are many Amish farms located throughout Charlotte Hall and the surrounding communities. The North St. Mary’s County Farmers Market is located in the Charlotte Hall Library and features local produce, baked goods and other specialties from Amish businesses. The Dent Chapel was built in 1883 on the grounds of the Charlotte Hall Military Academy, and today, it is a popular stop for visitors touring the historic area. For more information about local attractions, including Ye Coole Springs and the new Three Notch Trail, tourists can stop by the St. Mary’s County Welcome Center, which was formerly the home of the school’s headmaster.



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