Maryland · Cooling
Central Air Conditioning System Installation in Maryland
Whole-house central air for homes that have never had it, including the duct design work that decides whether the second floor is actually comfortable.
Adding central air to a house that was built without it is a duct design project with an air conditioner attached. Maryland is full of homes — 1920s Takoma Park bungalows, 1940s Silver Spring capes, 1950s Bethesda colonials — that were heated by radiators and cooled by window units for their first fifty years. Dropping a condenser in the side yard is the easy part. Getting conditioned air to the back bedroom on the second floor at 4pm in July is the engineering.
We design the distribution system first: supply trunk routing, register placement, and above all the return path, which is where retrofit systems are most often starved. Then we choose equipment that matches the duct system we can actually build in your house, whether that is conventional sheet metal in a soffit chase, small-diameter high-velocity tubing through existing wall cavities, or a hybrid with ductless heads on the rooms the ductwork cannot reach.
Where we workScope
What the job actually includes
- Whole-house Manual J load calculation plus Manual D duct design
- Supply and return routing plan drawn before any drywall is opened
- Air handler placement in attic, basement or closet with proper platform, pan and safety switch
- Insulated supply trunk and branch runs, sealed with mastic rather than tape alone
- Dedicated returns — the single most-skipped element in retrofit central air
- Condensate management with primary and secondary protection above finished space
- Balancing at the registers and a documented commissioning report
Maryland specifics
Code, permits and rebates
New duct systems in Maryland fall under the 2021 IECC as adopted statewide, which sets duct insulation minimums and duct leakage limits — ducts outside the conditioned envelope, such as in a vented attic, are held to a tighter standard and generally require a duct leakage test. Montgomery County DPS reviews mechanical permits for new duct systems, and in Takoma Park and other local historic districts, exterior condenser placement can additionally require review by the local historic preservation commission. We handle both filings.
Licensing
MD HVACR Contractor License #01-XXXXX. All refrigerant handling is performed by EPA Section 608 certified technicians, and equipment replacement is permitted and inspected through the county.
Process
How we run a central air installation job
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Whole-house assessment
We walk the attic, basement, chases and closets, and identify where a trunk line can physically run. In a 1926 Takoma Park foursquare that may mean a former laundry chute; in a 1955 Wheaton-adjacent rambler it is usually a basement joist bay run.
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Manual J and Manual D design
Load per room drives cfm per room, which drives duct sizing. This is the step that separates a retrofit that works from one where the front rooms freeze and the back bedroom never drops below 80.
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Distribution method decision
Conventional ducted, high-velocity small-duct, ductless, or a hybrid. Plaster walls, no soffit tolerance and a historic district review in Takoma Park or Kenwood often point to high-velocity or ductless; open basements and unfinished attics favor conventional sheet metal.
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Installation and drywall coordination
We sequence with your carpenter or painter where chases are being built, and we protect finished floors and plaster on every entry point. Older plaster does not forgive careless work.
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Balance and verify
Airflow measured at each register against the design cfm, dampers set, and a room-by-room temperature check on a hot afternoon rather than a mild morning.
Pricing
What moves the price
We do not publish a single number, because a number without your house attached to it is marketing rather than information. These are the variables that actually decide what a job costs, and we itemise all of them in writing before any work begins.
How much ductwork has to be built
A house with an unfinished basement and a walk-up attic gives us easy routing. A finished-on-every-level 1930s home with plaster walls and no chases is a different scope entirely, and we will say so before you sign anything.
Distribution technology
High-velocity small-duct systems thread through existing cavities without gutting walls, which preserves plaster and trim in historic homes, but the equipment and labor cost more per ton than conventional sheet metal.
Number of zones
Two-story homes almost always need two zones or two systems. A single system with one thermostat downstairs is the most common reason a retrofit disappoints its owner.
Local coverage
Central Air Conditioning System Installation by service area
Every one of these pages is written for that specific market — the housing stock we actually find there, the permitting authority, the utility situation and the failure patterns that repeat in those streets.
Montgomery County
Central Air Installation in Silver Spring
Retrofitting central air into radiator-heated Silver Spring homes
Read more →Montgomery County
Central Air Installation in Olney
Zoned central air for Olney's large single-system colonials
Read more →Montgomery County
Central Air Installation in Potomac
Whole-house cooling design for large Potomac properties
Read more →Montgomery County
Central Air Installation in Bethesda
Whole-house central air for renovated Bethesda homes with three generations of ductwork
Read more →Montgomery County
Central Air Installation in Germantown
Duct replacement and zoning for Germantown's three-level homes
Read more →Montgomery County
Central Air Installation in Takoma Park
High-velocity central air for Takoma Park houses with plaster worth protecting
Read more →Questions
Central Air Conditioning System Installation questions
Can central air be added to a house with radiators and no ductwork?
Will I lose closet space?
Why is my upstairs always hotter than downstairs?
How long does a full central air retrofit take?
Related
Work that usually comes up alongside this
Cooling
Air Conditioning Installation
Right-sized air conditioning installed to Manual J load calculations, with the county mechanical permit pulled and the ductwork checked before we quote.
Read more →Cooling
Ductless Air Conditioning System Installation
Mini-split systems for additions, converted attics, sunrooms and older homes where running ductwork would cost more than the equipment.
Read more →Whole system
Duct Cleaning Services
NADCA-method source removal with before-and-after camera documentation — and an honest answer about whether your ducts actually need it.
Read more →Whole system
HVAC Installers
Complete heating and cooling system installation by a crew that has been replacing systems in Montgomery County since 1985.
Read more →Talk to a technician
Tell us what the house is doing.
Describe the problem and we will tell you what it usually means, what it typically costs to diagnose, and when we can be there. No obligation, no scripted sales call.
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