The ductwork in a Pittsburgh home is often the part of the HVAC system that gets the least attention and creates the most problems. In older homes, ducts have been there for 40, 60, sometimes 90 years. They have collected dust, pet hair, construction debris, and the occasional dead mouse. Joints have loosened. Tape has dried up and fallen off. Sections in the attic or crawlspace have leaks that dump heated or cooled air into spaces nobody is living in.

Two services address ducting: cleaning (pulling decades of debris out) and sealing (closing leaks so your conditioned air goes where you actually want it). Done at the right time, they meaningfully improve indoor air quality and reduce energy bills.

Duct cleaning

Duct cleaning is what most homeowners ask about first. The honest answer: it helps in some cases and is overkill in others.

When duct cleaning is worth it

• After a major renovation. Drywall dust, sawdust, and construction debris settled in your ducts during the work.
• After a long vacancy. A house that has been closed up for years has dust, rodent activity, and sometimes mold buildup.
• Visible debris at supply registers. If you pull a register and see piles of dust, hair, or insulation in the duct, it is time.
• Persistent dust problem after other fixes. New filter, new air purifier, and you are still dusting the shelves every other day.
• Rodent activity or biological contamination. Smell, droppings, dead animals.
• Indoor air complaints during HVAC season. Symptoms get worse when the system runs.

When duct cleaning is not necessary

• Routine maintenance on a clean home. Most homes do not need duct cleaning more than once every 5 to 10 years.
• Annual “duct cleaning special” mailers. A lot of cleaners advertise heavily because cleaning is fast, low-margin, and they need volume. We do not push it on customers who do not need it.
• As a first move for allergies. Filter upgrades and air purification almost always do more for allergy symptoms than duct cleaning.

How Wahl cleans ducts

We use professional-grade equipment, not a wet-dry vacuum.

1. Inspection. Pull a couple of registers, check the trunk lines, look for any obvious problems before we start.
2. Negative pressure setup. We connect a high-volume vacuum to the trunk line near the air handler. This creates negative pressure throughout the duct system.
3. Agitation. Through each register, we run rotating brushes and compressed air to dislodge debris. The debris is pulled toward the central vacuum.
4. Component cleaning. Blower wheel, evaporator coil, and drain pan are cleaned separately.
5. Sanitization (optional). If there is a biological concern (mold, rodent activity, smells), we follow with an antimicrobial fog or spray that addresses the bacteria.
6. Reassemble and verify. Registers and grilles back on, system runs, no leaks.

Most homes take 4 to 6 hours.

Duct sealing

This is the service most Pittsburgh homes need more than they realize.

Why duct sealing matters

Industry estimates put typical ductwork leakage at 20 to 30 percent. In an older Pittsburgh home with original ducting, often it is worse. That means up to 30 percent of the heated or cooled air your furnace or AC produces never reaches the room you wanted, it gets dumped into your attic, your basement, your crawlspace, or behind your walls.

Symptoms of leaky ducts:

• High energy bills with normal usage. You are paying to heat the attic.
• Rooms that never get warm or cool enough. The supply duct to that room has a major leak somewhere upstream.
• Dust on every surface. Leaky returns pull in basement air, attic air, and wall cavity dust, which then circulates throughout the home.
• Whistling or rushing sounds when the system runs. Air escaping through a gap.
• Hot attic in summer or cold basement in winter. Heated or cooled air leaking into those spaces.
• Imbalanced humidity in different rooms. Supply leakage means less air to specific rooms, less dehumidification or humidification.

Two duct sealing methods

Manual sealing (mastic, foil tape, sheet metal screws). The traditional approach. We open up accessible ductwork (attic, basement, crawlspace), find leaks at joints and seams, and seal them with high-temp duct mastic or proper foil-backed tape (not cloth duct tape, which fails within a year). Sheet metal screws replace loose joints. Best for ducts we can physically reach.

Aeroseal-style aerosol sealing. For ducts we cannot easily reach (between floors, inside walls, hidden trunks), we use an aerosol sealant that is injected into the duct system. The sealant particles travel through the ductwork, hit leak points, and accumulate to plug them from the inside. The system stays pressurized during the process so the sealant can find every leak.

We pick the method based on duct access. Most jobs are a mix: manual sealing for what we can reach, aerosol for what we cannot.

What duct sealing actually accomplishes

For a typical Pittsburgh home with leaky ducts, sealing usually delivers:

• 10 to 20 percent reduction in heating and cooling costs.
• More even temperatures throughout the house.
• Less dust circulation.
• Better humidity control (your dehumidifier or humidifier actually reaches every room).
• Quieter system operation.
• Better indoor air quality, because you are not pulling unconditioned air from your attic or crawlspace into your living space.

How a Wahl ductwork visit works

1. Phone intake. Symptoms, age of home, what we are trying to fix.
2. Inspection. Technician walks the home with a camera and a few diagnostic tools. We look at every accessible section of ductwork, check static pressure on the system, and identify visible leaks or buildup.
3. Recommendation. Options on paper with prices. Standard rate and Preferred Customer Member rate side by side. We separate “must fix” from “nice to fix” so you can decide.
4. Service. Cleaning is typically half day. Sealing varies from half day (small jobs, accessible ducts) to two days (whole-home Aeroseal-style with complex layouts).
5. Verification. Static pressure check after sealing, register temperature checks, sometimes a smoke test to verify the seal.

Pricing

Flat-rate pricing on every quote. Cleaning and sealing are priced separately so you can pick one or both. Member and standard rates side by side. Financing through GoodLeap, Synchrony, Wells Fargo, and EasyPay.