Air Duct Cleaning Services › Duct Sealing and Minor Repairs

Duct Sealing and Minor Repairs in Greensboro, NC

Gaps and loose joints in ductwork send conditioned air into your attic, crawl space, or wall cavities instead of into your rooms. Over time, those leaks add up to real money spent heating and cooling spaces you don't live in. We locate the problem spots, seal them with mastic compound, and make minor connection repairs that actually hold.

Call (743) 222-5018

When to Call

When You Need Duct Sealing and Minor Repairs

Certain rooms in your home never reach the temperature on the thermostat
Your HVAC runs longer cycles than it used to without a clear equipment reason
You can feel air blowing in the attic or crawl space when the system runs
A home energy audit flagged duct leakage as a significant efficiency problem
We found loose joints or gaps during a cleaning or inspection visit
You had ductwork moved or extended during a renovation and the connections weren't sealed

How It Works

Our Process for Duct Sealing and Minor Repairs

1

Leak identification

We run the system and check accessible duct runs in the attic, crawl space, or basement for air escaping at joints, seams, and connection points.
2

Problem area marking

We mark every gap, loose collar, or failed joint we find before starting any sealing work. You see the full list before we touch anything.
3

Old sealant removal where needed

Failed duct tape or deteriorated sealant gets removed before we apply anything new. Sealing over old tape doesn't hold.
4

Mastic application

We apply water-based mastic compound to all identified leak points. Mastic stays flexible as the duct expands and contracts with temperature — duct tape does not.
5

Minor mechanical repairs

Loose collars, disconnected flex duct sections, and joints that have pulled apart get reconnected and secured before sealing. Sealing alone doesn't fix a physical separation.
6

Post-repair check

We run the system again after sealing and check the repaired areas for remaining leakage. We also check that airflow improved in the rooms that were underperforming.

What's included

Visual leak detection across all accessible duct runs and connections
Mastic sealant application at all identified gap and joint locations
Minor mechanical reconnection of loose or separated duct joints
Removal of failed existing duct tape or sealant before new application
Post-repair system run and airflow check

What's not included

Full duct replacement — if a section is too damaged to repair, replacement is a separate scope and cost
Aeroseal or pressurized duct sealing systems — we do accessible manual sealing, not whole-system pressurization
HVAC equipment repairs if poor airflow is caused by a blower or equipment issue rather than duct leakage

Real Situations

Common Scenarios in Greensboro

A homeowner in a 1980s home in northeast Greensboro has a bonus room above the garage that's always 10 degrees warmer than the rest of the house in summer.

Bonus rooms and spaces above garages often have long duct runs with multiple joints that loosen over time. We trace the run serving that room, find where air is escaping, and seal those points so supply air actually reaches the register.

A homeowner had HVAC ductwork extended during a kitchen renovation two years ago and energy bills have been higher since the work was done.

Renovation ductwork connections are a common source of leakage — contractors often use duct tape, which fails within a few years. We inspect every connection made during the renovation and reseal with mastic.

A homeowner in a crawl space home in southern Guilford County finds the crawl space temperature is noticeably warm in winter, suggesting conditioned air is escaping down there.

We access the crawl space and check the full length of the supply trunk and every branch takeoff for gaps. Crawl space duct systems in older homes frequently have unsealed joints at every connection point.

Greensboro Context

Why this matters in Greensboro

Greensboro sits in a climate zone where both heating and cooling costs matter, which means duct leakage hits homeowners twice a year. Crawl space homes are common throughout Guilford County, and crawl space ductwork takes a beating from moisture, pests, and temperature swings. A lot of the flex duct connections in homes built through the 1990s were never properly sealed to begin with — they were stapled and taped, and that tape is gone now.

Straight Talk

About pricing & scope

The scope of sealing work depends entirely on how many problem areas exist and how accessible the ductwork is. Attic ductwork in a finished home is harder to reach than a basement system. We quote based on what we can physically access — if we find issues in concealed walls or chases, we'll tell you what we can and can't get to.

What This Fixes