AC Installation in Leonardtown, MD
A new air conditioner in Leonardtown will run from June through September every year. Tell us about the house, and a licensed contractor who covers St. Mary's County will get in touch.
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What summer in Leonardtown asks of a new air conditioner
Your air conditioner works four months a year here, June through September, with summer afternoons averaging 86°F. That is a shorter season than a lot of the country sees, but the unit still has to keep up on the hottest days without straining.
St. Mary's County has logged 146 damaging wind events and 25 hail storms over the past ten years, with hail up to 1.75 inches. Whatever gets installed sits outside through that. Any new central air conditioner installed today has to meet a federal minimum of 14.3 SEER2, so the efficiency question is already settled. What matters more here is a unit and installation that can take the weather.
- 4 months
- June through September, your air conditioner is on duty
- 86°F
- the average summer afternoon it cools against
- 25 hail events
- in ten years, and hail bends the fins on outdoor coils
- 13.4 SEER2
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
Going above the federal minimum saves little here, about $20 a year.
Estimates for a typical St. Mary's County home, from EIA household energy data, Maryland fuel prices and NOAA climate normals. Your home will differ.
Maryland requires HVAC contractors to hold a state license.
That license means the state tested this contractor before handing them the paperwork, and the Maryland Board of Heating, Ventilation, Air Conditioning, and Refrigeration Contractors keeps the record. The license covers the contractor as a business, not this specific job at your house, so it tells you the person doing the work has a real file behind their name, not that this install has been checked yet.
That check comes separately. In most cities and counties, installing an air conditioner needs a permit from the local building office, and an inspection once the unit is in. That inspection is what confirms this particular job was done right, on top of whatever the license already says about the contractor doing it.
Sources: Maryland General Assembly · Maryland Department of Labor
- What size air conditioner does my house need?
- It depends on your home's square footage, layout, insulation, window count and how much shade it gets, not just one number you can look up. A contractor works this out with a load calculation, which looks at all of those things together. Going by size alone, without that calculation, tends to land you with a unit that's too big, and an oversized system cools the air fast but shuts off before it pulls the humidity out of the room. Summer afternoons here average 86°F for four months, June through September, so getting the size right matters for how the house feels, not just for what the thermostat reads.
- Should I replace the whole system or just the outdoor unit?
- In most cases the outdoor unit and the indoor coil need to be matched, so replacing only one usually means replacing both. The two parts are built to work together, and a new outdoor unit paired with an old coil often won't hit the efficiency or performance it's rated for. If your indoor coil is still in good shape and compatible with the new outdoor unit, a contractor can tell you after looking at both. Homes here run cooling from June through September, so a mismatched system has months to show the problem, not just a few weeks.
- Do HVAC contractors in Leonardtown need a state license to work on my home?
- Yes. Maryland requires HVAC contractors to hold a state license, issued through the Maryland Board of Heating, Ventilation, Air Conditioning, and Refrigeration Contractors. The license covers the contractor as a business, not each individual job. For an air conditioner installation, you'll also likely need a permit from the local building office and an inspection once the work is done.