AC Installation in La Plata, MD
A new air conditioner in La Plata will run from June through September every year. Tell us about the house, and a licensed contractor who covers Charles County will get in touch.
Tell us about the job
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Four months of real heat, and storms in between
La Plata cools from June through September, with summer afternoons averaging 86°F. That is not a long season, but it is a demanding one, and a new system has to be sized to handle those afternoons without straining.
The area has seen its share of severe weather too. Over the past ten years, the region recorded 26 hail events, one dropping stones up to 2.75 inches, along with 188 damaging wind events. Outdoor condenser units sit exposed to that weather, so how well one is installed matters as much as the unit itself. Any new central air conditioner built since 2023 also has to meet a federal minimum of 14.3 SEER2, so efficiency is built into what you're allowed to install, not just what you choose.
- 4 months
- June through September, your air conditioner is on duty
- 86°F
- the average summer afternoon it cools against
- 26 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 Charles 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.
Licenses are issued by the Maryland Board of Heating, Ventilation, Air Conditioning, and Refrigeration (HVACR) Contractors.
Sources: Maryland General Assembly · Maryland Department of Labor
- What size air conditioner does my house need?
- The right size depends on your home's square footage, insulation, window area, and layout, not just a rule of thumb per square foot. A contractor will do a load calculation, often called a Manual J, to find the correct tonnage for your house. Installing one that is too big or too small leaves you with a system that cycles too often or never quite keeps up on a 86°F afternoon.
- Should I replace the whole system or just the outdoor unit?
- In most cases you replace both the outdoor unit and the indoor coil together. The two are matched to work at a specific efficiency and capacity, and pairing a new outdoor unit with an old coil can keep it from reaching the SEER2 rating it's supposed to hit. A contractor can look at the age and condition of your indoor coil and tell you whether it's a match for a new outdoor unit or whether it needs to come out too.
- Do HVAC contractors in La Plata 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 (HVACR) Contractors. That license covers the contractor doing the work, not the individual job. For an AC installation, you'll also need a permit from the local building office and an inspection once the work is finished.