AC Installation in Baltimore, MD
A new air conditioner in Baltimore will run from June through September every year. Tell us about the house, and a licensed contractor who covers Baltimore will get in touch.
Tell us about the job
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Four months of real heat in Baltimore
Baltimore summers run June through September, and afternoons average 87°F. That is four months where your air conditioner has to work every day, not just on the hottest stretch of the year.
Any new central air conditioner installed here has to meet the federal minimum of 14.3 SEER2. That is the floor, not a feature, so ask what rating the unit you are getting actually carries. Baltimore has also seen 45 damaging wind events over the past ten years, so if the outdoor unit is going in an exposed spot, that is worth thinking about too.
- 4 months
- June through September, your air conditioner is on duty
- 87°F
- the average summer afternoon it cools against
- 6 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
A higher-efficiency unit would save about $30 a year to run in Baltimore compared with a new unit at the federal minimum.
Estimates for a typical Baltimore 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.
The Maryland Board of Heating, Ventilation, Air Conditioning, and Refrigeration Contractors issues that license to the contractor, not to the job. It means the company on your paperwork was tested and is on record with the state. It does not mean the state signs off on this particular installation.
That part falls to your city or county. Most places in Maryland require a permit before a new air conditioner goes in and an inspection once it's done, so it's the local building office, not the state license, that checks the work itself.
Sources: Maryland General Assembly · Maryland Department of Labor
- What size air conditioner does my house need?
- There's no single number that fits every house. The right size depends on the square footage, how much insulation is in the walls and attic, how many windows you have and which way they face, and the height of your ceilings. A unit that's too big cools the house fast but shuts off before it pulls the humidity out of the air, so rooms feel clammy. A unit that's too small runs constantly on the 87°F afternoons Baltimore sees all summer and still can't keep up. A contractor will measure the house and run a load calculation to get the size right, rather than going by the size of the old unit or the square footage alone.
- Should I replace the whole system or just the outdoor unit?
- If the indoor coil and outdoor unit are different ages or different efficiency levels, replacing just the outdoor unit can cause problems. The two parts are matched at the factory to work at a certain capacity and refrigerant charge, and pairing a new condenser with an old coil can mean the system never reaches its rated efficiency, sometimes not even close. It can also void the manufacturer's warranty on the new equipment. New units also have to meet the 14.3 SEER2 minimum that took effect in 2023, and an old coil often can't handle the refrigerant a new condenser uses. A contractor can check what's in your attic or closet now and tell you whether the coil is compatible.
- Do HVAC contractors in Baltimore 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 is held by the contractor, not issued job by job, so it's worth asking to see it before work starts. Installing a new air conditioner also usually needs a permit from the local building office and an inspection once the work is finished.