Ductwork installation and replacement for even, quiet airflow

Static pressure is the resistance the blower works against. We measure it at the equipment and compare it with the manufacturer's rating. High static pressure indicates restrictions such as undersized ducts, clogged filters, dirty coils or closed dampers, and it reduces airflow, efficiency and equipment life.

Airflow at individual registers shows how air is being distributed. Rooms that receive far less than their share point to specific branch problems. Temperature readings at supply registers help identify ducts losing heat or cooling as they pass through unconditioned spaces.

Where appropriate, duct leakage can be quantified with a pressurization test that measures how much air escapes from the system. That test gives a baseline before work begins and proves the improvement afterward.

Flexible duct is widely used and works well when installed correctly, but it is easily misused. Runs that sag between supports, bend sharply or are compressed by insulation or storage lose a large share of their capacity. Excess length coiled in an attic adds resistance without any benefit.

Disconnected or poorly sealed joints are another frequent issue. A branch that has slipped off its collar may dump conditioned air directly into an attic. Joints sealed only with cloth-backed tape often fail as the adhesive dries out over time.

Return ducts are often undersized or missing altogether in some rooms. A return side that cannot move enough air starves the blower and can pull air from unintended places, such as the basement, garage or wall cavities, bringing dust and odors with it.

When sections need replacement, the new design is based on room-by-room airflow needs and the capacity of the equipment. Industry design methods such as ACCA Manual D guide duct sizing so that each room receives its intended airflow at a pressure the blower can handle.

Trunk and branch layouts, register placement and return locations are all considered. Balancing dampers allow airflow to be fine-tuned after installation. Where equipment is also being replaced, the duct design and equipment selection are coordinated so they work together; see Furnace Replacement for how that planning fits into a furnace project.

Materials are chosen for the location. Sheet metal trunks are durable and smooth. Flexible duct can be appropriate for short branch runs when fully extended and properly supported. Ducts in unconditioned spaces receive insulation rated for that application.

Sealing is one of the most cost-effective duct improvements. We seal joints and seams with mastic or listed tapes designed for duct use, paying particular attention to connections at the equipment, where pressures are highest. Register boots are sealed to drywall or flooring to prevent air from escaping into wall and floor cavities.

Insulation keeps ducts in attics and crawlspaces from gaining heat in summer and losing it in winter. It also prevents condensation on cold supply ducts in humid weather, which can otherwise drip onto ceilings and insulation.

Support and protection prevent future damage. Ducts are hung with proper straps at appropriate intervals and routed away from areas where they are likely to be stepped on or crushed.

Some older homes contain duct insulation, wrap or tape that may include asbestos. Materials suspected of containing asbestos should not be disturbed until they are evaluated by qualified professionals. If our technicians encounter suspect material, they stop and explain the next steps before continuing.

Combustion safety can also be affected by duct leaks. Return leaks near fuel-burning appliances can depressurize a space and interfere with venting. Part of our work is making sure duct changes do not create conditions that affect how a furnace or water heater drafts.

Pest damage, moisture and mold in ducts are noted when found. Depending on severity, sections may be replaced rather than cleaned, and the underlying cause, such as a moisture problem, is addressed.

After duct work is complete, the technician remeasures static pressure, checks airflow at registers and, where a leakage test was performed, repeats it. Those readings are compared with the original measurements so you can see the improvement in numbers, not just in comfort.

Homeowners commonly notice more even temperatures between rooms, quieter operation, less dust and shorter run times. Equipment that no longer struggles against high resistance may also last longer.

We provide a summary of the work, including sections replaced, joints sealed and final readings. That record is useful for future service and for anyone evaluating the home later.

Duct projects range from sealing a handful of accessible joints to replacing an entire system. Because the scope varies so widely, measurements are the only reliable basis for a price. Our proposals break the work into clear items, such as sealing the return plenum, replacing specific attic branches, adding a return to a bedroom or insulating a crawlspace trunk, each with its own price.

That structure lets you prioritize. Sealing leaks at the equipment and on the return side often delivers the largest improvement for the smallest investment. Replacing crushed or disconnected branches usually comes next, because those problems directly starve rooms of air. Complete redesigns make the most sense when equipment is being replaced or when the existing layout simply cannot deliver comfort.

If you are planning a new furnace or air conditioner, addressing duct problems at the same time avoids paying for capacity the ducts cannot deliver. We coordinate both scopes so the equipment and the distribution system are sized for each other, and the final commissioning readings reflect the combined result.