AC Installation in Frederick, MD
A new air conditioner in Frederick will run from June through September every year. Tell us about the house, and a licensed contractor who covers Frederick County will get in touch.
Tell us about the job
It takes about a minute.
Four months of real heat, every year
Frederick County needs cooling from June through September, four months a year, with summer afternoons averaging 84°F. That's the stretch your air conditioner has to carry the house without a break.
Any new central air conditioner installed today has to meet 14.3 SEER2, the federal minimum. That's the floor, not a feature, and it's worth knowing going in so you can judge what a contractor is actually offering you above it.
- 4 months
- June through September, your air conditioner is on duty
- 84°F
- the average summer afternoon it cools against
- 20 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 $10 a year.
Estimates for a typical Frederick 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.
Maryland's Board of Heating, Ventilation, Air Conditioning, and Refrigeration Contractors tests and records the people it licenses. The license belongs to the contractor, not to this one job, so the same license covers whatever else they install or repair. It means the state has checked this contractor's qualifications and keeps a record of who they are.
For the install itself, most cities and counties in Maryland require a permit from the local building office, with an inspection once the work is done. That inspection is what catches a refrigerant line that was not sealed right or a unit set up wrong. The license tells you the state has vetted the contractor. The permit and inspection tell you this particular installation was checked.
Sources: Maryland General Assembly · Maryland Department of Labor
- What size air conditioner does my house need?
- The right size depends on your square footage, how much insulation you have, how many windows you have and which way they face, and your ceiling height. A unit that's too big cools the air fast but shuts off before it pulls the moisture out, so the house feels damp. One that's too small runs constantly and never quite catches up on a hot afternoon. A contractor works this out with a load calculation on your actual house, not a chart based on square footage alone.
- Should I replace the whole system or just the outdoor unit?
- In most cases replacing just the outdoor unit is not a good idea. The outdoor unit and the indoor coil are matched to work together, and pairing a new one with an old coil often means you lose efficiency and can run into problems getting it to run right. If your indoor coil is old, a contractor will usually recommend replacing both at the same time. The exception is when the coil is new enough and still in good shape, which a contractor can check when they look at the system.
- Do HVAC contractors in Frederick 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. That license covers the contractor as a business, not each individual job. For the installation itself, you'll also need a permit from the local building office, and the work gets inspected once it's done.