Ductwork repair in Pennsylvania

Ducts are the least glamorous part of a heating and cooling system and the most common reason a correctly sized, properly working furnace still leaves a house uncomfortable. Air conditioned at real expense is being lost before it arrives.

Symptoms that point at ductwork

• One or two rooms are always too hot or too cold, in both seasons.
• The furnace or air conditioner runs constantly but the house never settles.
• Rooms furthest from the equipment get noticeably less air.
• The basement or crawlspace is warm in winter while the bedrooms are not.
• Noticeable dust, or dust that returns immediately after cleaning.
• Whistling, roaring or booming when the system starts.
• Bills that do not match how little comfort you are getting.

What we find

Leaks at the joints

Most duct leakage is at connections, takeoffs and the plenum, and a lot of it was never sealed properly to begin with. Where the ducts run through an unconditioned basement, crawlspace or attic, that leaked air is simply lost, and the system pulls replacement air in from those same places. Sealing is done with mastic or foil tape rated to UL 181 — not cloth duct tape, which dries out and lets go, often within a few years.

Disconnected and crushed runs

Flexible duct pulls off its collar, sags, kinks over a joist, or gets crushed by someone storing boxes on it. We have found runs delivering air into a crawlspace for years while the room above was written off as impossible to heat. This is common, cheap to fix, and dramatic when corrected.

Undersized returns

Supply ducts get the attention; the return side is undersized far more often. A system that cannot get air back cannot deliver air out. It raises static pressure, trips furnace limit switches, freezes evaporator coils in summer, and shortens blower life. Adding return capacity is often the single most effective duct improvement in an older house.

Retrofitted ducts in houses built for radiators

This is a distinctly Pennsylvania problem. A great deal of the state's housing predates forced air, and when central heating and air were added, ducts were threaded through whatever cavities existed. The result is long, convoluted, undersized runs, often with a trunk too small for the airflow. These systems can usually be improved substantially without being rebuilt — by sealing, by correcting the worst restrictions, and by balancing properly.

Ducts that were never balanced

Dampers exist to apportion air between runs and are frequently left wherever they were on installation day. Proper balancing measures what each room is getting and adjusts to suit, which is a different exercise from closing registers in rooms you are not using.

Insulation, not just sealing

A sealed duct running through an unheated attic or a vented crawlspace still loses heat through its walls. In this climate, ducts outside the conditioned envelope should be insulated as well as sealed. In summer the same ducts gain heat and can sweat, which causes its own damage to joists and ceilings.

What a visit involves

We inspect the accessible duct system, check static pressure to understand what the system is actually fighting, measure airflow and temperatures at the problem rooms, and trace the runs serving them. Then you get a plain explanation of what is wrong and what fixing it involves — which is sometimes a half-day of sealing and reconnection, and occasionally a recommendation to rework a section properly rather than keep patching.

What we will tell you honestly

Duct cleaning is sold heavily and is rarely the answer to a comfort problem. It has a place — after construction work, or with a verified contamination issue — but if your complaint is a cold bedroom, cleaning the ducts will not fix it. Sealing, reconnecting and balancing will.