Aeroseal of Maryland in Baltimore: Duct Sealing for Homes Losing Conditioned Air

Aeroseal of Maryland is a licensed HVAC contractor in the Baltimore area specializing in aeroseal duct sealing, a pressurized adhesive process that seals leaks inside ductwork without requiring walls to be opened or ducts to be dismantled. The service targets homeowners whose heating and cooling systems are losing 15 to 40 percent of conditioned air through gaps and punctures in supply and return ducts, a problem common in older homes and those with uninsulated basement or attic ductwork.

What aeroseal duct sealing actually is

Traditional duct repair requires cutting into walls, ceilings, or crawlspaces to access leaking seams. Aeroseal bypasses that disruption. A technician pressurizes the duct system with a non-toxic, water-based sealant in aerosol form. The air carries the sealant throughout the ductwork; it adheres only to the edges of holes and cracks, sealing them from the inside. The process is non-invasive, generates no dust inside the home, and leaves no mess requiring drywall repair afterward. It works on most residential duct configurations and is particularly effective for scattered small leaks rather than catastrophic ruptures.

Services and pricing

Aeroseal of Maryland begins with a duct leakage test, using a blower door and pressure measurement to quantify how much air escapes the system before sealing. This diagnostic typically costs between $200 and $350, depending on home size and duct complexity. If you proceed with sealing, the service cost ranges from $800 to $2,500 for most Baltimore-area homes, depending on the length of ductwork, number of leaks detected, and severity of the leak area. Homes with 2,000 to 3,000 square feet and moderate duct leakage generally fall in the $1,200 to $1,800 range. The diagnostic fee is often credited toward the sealing work if the homeowner moves forward. Aeroseal of Maryland also offers preventative maintenance contracts covering annual filter changes and system inspections, priced around $150 to $200 per visit.

How it compares to other Baltimore-area HVAC approaches

Sealed ducts improve SEER efficiency ratings and reduce the workload on your furnace or air handler, lowering energy costs by 10 to 25 percent depending on the severity of existing leaks. A licensed HVAC contractor can offer manual duct sealing using mastic or tape on accessible ducts, which costs $400 to $1,200 but requires crawlspace access and may miss internal leaks. Ductless mini-split systems (offered by firms like Aire One and Comfort Systems Baltimore) avoid ductwork entirely and cost $3,500 to $8,000 per zone installed, making them far more expensive than sealing existing ducts but advantageous if you have no ducts to begin with or are replacing an obsolete forced-air system. For homes with functional ductwork and measurable leakage, Aeroseal is more cost-effective and less invasive than replacing ducts or switching to a ductless setup. For homes with sealed, modern ducts, the service offers little benefit.

Who it suits and who it does not

Aeroseal of Maryland suits homeowners in rowhouses and detached homes with basements or uninsulated attics where ductwork runs exposed or poorly insulated, homes built before 1990 when duct sealing was not standard practice, and owners noticing uneven heating or cooling between rooms despite a functioning system. It also benefits anyone whose energy bills are climbing and want to rule out air loss as the culprit before investing in a new HVAC unit. The service does not suit homes with ductwork running through conditioned spaces (walls, insulated crawlspaces) where leakage is minimal, homes with mini-split or radiant heating systems, or those whose primary problem is an undersized or outdated furnace rather than duct leakage. Homeowners should have ductwork inspected first; if ducts are severely deteriorated, replacement is preferable to sealing.

What the first visit involves

An Aeroseal technician will conduct a blower door test, measuring the cubic feet per minute of air escaping the duct system at standard pressure. You will receive a report showing leakage as a percentage of total airflow. If you approve the sealing, the technician seals all accessible duct connections with tape, pressurizes the system with the aerosol sealant, and runs it for 30 to 45 minutes while the sealant cures. A post-sealing blower door test confirms the improvement, typically reducing leakage by 70 to 90 percent. The entire appointment takes 2 to 3 hours.

Hours, location, and logistics

Aeroseal of Maryland operates Monday through Friday, 8 a.m. to 5 p.m., with emergency appointments available. The company serves Baltimore City and surrounding Baltimore County, Anne Arundel County, and Howard County. No appointment deposit is required; payment is due upon completion. Confirm current service hours and availability by phone, as HVAC contractors often adjust scheduling seasonally.

Aeroseal sealing extends the life of existing ductwork and reduces heating and cooling costs without renovation, making it a practical choice for Baltimore homeowners with leaky ducts who want efficiency gains without system replacement.