You just replaced the thermostat batteries for the third time this month because the west bedroom never seems to hit the set temperature, no matter what the display says. Meanwhile the hallway outside it feels ten degrees warmer, and the furnace runs like it's trying to heat the whole block. If that sounds familiar, the problem probably isn't your thermostat or even your furnace. It's likely hiding inside the walls, in ductwork you've never seen and never thought to question.
- Leaky ducts waste conditioned air before it reaches you: Air sealed inside ductwork often escapes into attics, crawlspaces, and wall cavities instead of the rooms you're paying to heat or cool.
- Aeroseal seals from the inside out: A pressurized aerosol sealant finds and closes gaps as small as a pencil point, without tearing into drywall or ceilings.
- Hot and cold spots often trace back to duct leakage, not equipment failure: A perfectly good furnace or AC can still leave rooms uneven if the ducts feeding them are leaking air along the way.
- Duct sealing and duct cleaning solve different problems: Cleaning removes debris; sealing closes physical gaps. Homes often need one, the other, or occasionally both.
- A leakage report gives you a measurable before-and-after number: You don't have to take anyone's word for how leaky your ducts were or how much the sealing improved things.
- Colorado Springs is one of the few markets where this service is even available: A & Z Mechanical holds Aeroseal duct sealing certification, a credential most local HVAC companies don't carry.
1. The Hidden Problem of Leaky Ductwork
Ductwork is the part of an HVAC system nobody sees and almost nobody thinks about, which is exactly why it gets away with wasting so much conditioned air. Most residential duct systems run through attics, crawlspaces, and unconditioned basements, connected in sections with mastic, tape, or mechanical fasteners that degrade over years of temperature swings. In a lot of Colorado Springs homes, especially those built before more current duct-sealing standards became common practice, those connections were never airtight to begin with. The result is a duct system that leaks heated or cooled air into spaces where nobody lives, long before that air ever reaches a supply register in your living room or bedroom.
The scale of this waste is bigger than most homeowners assume. The U.S. Department of Energy notes that a significant share of the air moving through a typical duct system is lost to leaks, holes, and poorly connected joints, particularly in ducts that run through unconditioned spaces. That means your furnace or air conditioner can be running exactly as designed, cycling on schedule and hitting its rated output, while a meaningful portion of what it produces never makes it to the rooms you're trying to heat or cool. You end up paying to condition air twice: once when the equipment creates it, and again when the thermostat calls for more because the first round never arrived.
Why Colorado Springs Ductwork Is Especially Vulnerable
At 6,035 feet, Colorado Springs homes deal with wider daily temperature swings and drier air than most of the country, both of which accelerate the expansion and contraction that loosens duct joints over time. Homes in Old North End, Manitou Springs, and other older neighborhoods often have ductwork that predates modern sealing practices, or duct systems that were extended and modified over the decades without much attention to airtightness. Add in attic temperature extremes that swing from below freezing in winter to well over 100 degrees in a hot attic in summer, and you have conditions that are tough on duct seams year after year.
The Symptoms Homeowners Actually Notice
Homeowners rarely walk into a room and think "my ducts are leaking." Instead, they notice a bedroom that never quite reaches the thermostat setting, a furnace that runs longer than it seems like it should, or utility bills that climb without an obvious cause. Dust buildup near supply registers, a house that feels drafty despite a working furnace, and rooms at opposite ends of the house that never agree on temperature are all classic signs of duct leakage rather than equipment trouble.
Why New Equipment Doesn't Fix This
One of the most common misunderstandings we hear from Colorado Springs homeowners is the assumption that a new furnace or air conditioner will solve uneven comfort on its own. It won't, if the ducts feeding that equipment are still leaking. A brand-new Carrier system paired with leaky ductwork will still lose conditioned air along the way, which means you can spend on a full equipment replacement and still end up with the same cold bedroom and the same high bills. Sealing the distribution system is what makes the equipment's output actually count.
2. How Aeroseal's Pressurized Sealing Process Works
Aeroseal is a duct sealing technology that works from the inside of the ductwork rather than requiring access to every seam from the outside, which is what makes it practical in finished homes with ducts buried behind drywall and ceilings. The process introduces a fine aerosol sealant into the duct system while it's pressurized, and that sealant particulate travels through the ductwork until it reaches a leak. At the leak point, the escaping airflow forces the particles together, and they bond and cure at the edges of the gap, building up a seal until the leak closes.
This is fundamentally different from traditional duct sealing methods, which rely on a technician physically reaching every accessible seam with mastic or foil tape. Those methods work fine on the joints a technician can reach, but they do nothing for leaks hidden inside walls, above dropped ceilings, or in sections of duct that were never meant to be exposed again after construction. Aeroseal doesn't care where the leak is located inside the pressurized system. It finds gaps a technician physically cannot access and seals them from the inside, which is why it can close far more of a home's total duct leakage than manual sealing alone.
The Testing and Preparation Phase
Before any sealant goes into the system, a comfort advisor first isolates the ductwork, sealing off supply registers and return grilles temporarily, and connects testing equipment that measures how much air is currently escaping from the system. This baseline measurement matters because it establishes exactly how leaky the ductwork is before any work begins, giving you a real number rather than a general impression.
The Sealing Process Itself
Once baseline leakage is measured, the Aeroseal system introduces the aerosolized sealant into the pressurized ductwork, and the process runs while a computer monitors leakage in real time. As leaks close, the system tracks the drop in total leakage, and the process continues until leakage reaches a target reduction or the ductwork is sealed as tightly as the situation allows. Most sealing sessions for a typical home are completed in a matter of hours, not days, and don't require cutting into walls or ceilings.
What Happens to the Sealant Over Time
The sealant used in the Aeroseal process is a water-based polymer designed specifically for this application, and it only bonds where air is actively escaping through a gap. It does not coat the interior duct surfaces where air is already flowing normally, which is an important distinction homeowners sometimes ask about. Manufacturer documentation on the product's composition and application is publicly available for homeowners who want the technical detail behind the process.
3. Energy Savings and Eliminating Hot and Cold Spots
The most immediate, noticeable result of duct sealing for most Colorado Springs homeowners isn't a number on a utility bill, it's walking into the room that used to run cold and finding it actually matches the thermostat. When duct leakage is closed, the air your furnace or air conditioner produces travels to the registers it was designed to reach instead of dispersing into an attic or crawlspace along the way. That means more consistent airflow to every room on the system, including the ones that have always been the outliers in your house.
Beyond comfort, sealed ductwork reduces the amount of conditioned air your system has to produce in the first place to reach a given temperature. The ENERGY STAR program identifies duct leakage as one of the more overlooked sources of energy waste in a home's heating and cooling system, and closing that leakage means your equipment doesn't have to run as long or as often to satisfy the thermostat. For a home where the furnace runs long cycles trying to heat a chronically cold bedroom, sealed ducts can mean shorter, more efficient cycles across the whole system.
Hot and Cold Spots: The Room-by-Room Impact
Uneven comfort is rarely random. It usually traces back to specific duct runs that leak more than others, often the longest runs, the ones with the most joints, or sections that pass through the most extreme attic or crawlspace temperatures. Sealing those leaks restores the airflow balance the system was originally designed to deliver, which is why homeowners often report that the specific rooms that always struggled, not the whole house evenly, show the most dramatic improvement.
Why Sealing Pairs Well With Existing Equipment
Duct sealing doesn't require a new furnace or air conditioner to deliver a benefit. It works with whatever equipment is currently installed, which makes it a practical option for homeowners who aren't ready for a full system replacement but are tired of chasing comfort complaints room by room. It also makes any future equipment upgrade perform closer to its rated efficiency, since sealed ducts mean less of that equipment's output gets lost before it reaches you.
A Realistic Expectation for Older Homes
Older ductwork, particularly in homes with ducts that have never been sealed or serviced, often shows a level of leakage that surprises homeowners once it's actually measured. Sealing that leakage down to a much lower rate is a realistic outcome for most systems, though the exact improvement depends on the condition and layout of the ductwork. A comfort advisor can walk you through what to expect for your specific home based on the initial leakage test.
4. Duct Sealing vs Duct Cleaning: What's the Difference
These two services get confused constantly, and it's an honest mix-up. Both involve ductwork, both are marketed as improving your indoor environment, and both are services homeowners rarely think about until something prompts them to. But they solve entirely different problems, and buying one when you need the other won't fix what's actually bothering you.
Duct cleaning removes dust, debris, pet hair, and other buildup from inside the ducts, improving the cleanliness of the air moving through the system. Duct sealing closes physical gaps and leaks in the ductwork itself, improving how efficiently air actually reaches its destination. A home can have spotlessly clean ducts that still leak conditioned air into the attic, and a home can have leak-free ducts that still need a cleaning if there's visible dust or debris buildup. Neither service substitutes for the other.
| Attribute | Duct Sealing (Aeroseal) | Duct Cleaning |
|---|---|---|
| Problem it solves | Air escaping through gaps and leaks | Dust, debris, and buildup inside ducts |
| Primary benefit | Energy efficiency, even room temperatures | Cleaner air moving through the system |
| How it's performed | Pressurized aerosol sealant applied from inside | Brushes and vacuum equipment remove debris |
| Fixes hot/cold spots | Yes, directly addresses leakage causing uneven airflow | No, does not affect airflow leakage |
| Measurable result | Before-and-after leakage percentage report | Visual inspection, not a numerical metric |
| Frequency needed | Typically a one-time service unless ducts are modified | Periodic, depending on household conditions |
When Homeowners Actually Need Both
Some homes benefit from both services, particularly older houses where dust has accumulated over years alongside long-standing leaks. In those cases, a comfort advisor can walk through which issue is driving which symptom, since a homeowner dealing with both dusty registers and a chronically cold bedroom is dealing with two separate problems that happen to live in the same ductwork.
Why Sealing Gets Overlooked
Duct cleaning has been marketed to homeowners for decades, which is part of why it's the more familiar service. Aeroseal duct sealing is a newer technology, and it's specialized enough that few HVAC contractors in any given market are actually certified to perform it, which means most homeowners have simply never heard of it as an option. A & Z Mechanical is one of the only Aeroseal certified contractors in the Colorado Springs region, which is part of why this stays an underused solution locally despite how directly it addresses uneven comfort and wasted energy.
5. What a Before and After Leakage Report Looks Like
One of the more reassuring aspects of Aeroseal duct sealing is that it isn't a service you have to take on faith. The process generates an actual measurement of your duct system's leakage before sealing begins and again once the process is complete, giving you a documented comparison rather than a general assurance that things "should be better now."
Before sealing starts, the system is pressurized and measured to establish a baseline leakage figure, expressed as a rate of airflow escaping the ductwork. This baseline reflects the real condition of your specific ducts, not an industry average or a rule of thumb, which matters because duct leakage varies enormously from house to house depending on age, construction, and how the system has been modified over the years. Once the aerosol sealant process runs and leaks close, the same measurement is taken again, and the report shows the leakage rate after sealing alongside the percentage improvement.
Reading Your Report
A leakage report typically shows the pre-seal leakage rate, the post-seal leakage rate, and the percentage reduction achieved. This gives you a concrete number to reference, whether that's for your own records, for a conversation about a future equipment purchase, or simply for peace of mind that the service did what it was supposed to do. It's the kind of documentation that turns duct sealing from an abstract promise into a verifiable result.
Why This Matters for Trust
For a service most homeowners have never heard of, walking away with a measurable, documented result matters. It's the difference between being told a job was done well and being shown the numbers that prove it. That kind of transparency lines up with how A & Z approaches every service call: honest diagnostics and a straight answer, backed by a report you can actually look at rather than a verbal assurance you're asked to trust on its own.
What to Do With the Report Afterward
Keep your leakage report with your HVAC service records. If you ever sell your home, it's a documented improvement that can be shared with a buyer or an inspector. If you're weighing a future furnace or air conditioner replacement, it's useful context for a comfort advisor sizing new equipment, since sealed ductwork changes the airflow calculations involved in a proper system design.
6. Is Aeroseal Right for Your Colorado Springs Home
Not every home needs Aeroseal, and not every duct sealing conversation ends in a "yes." The service tends to make the most sense for homes with noticeable comfort complaints (chronic hot or cold rooms), homes with ductwork running through unconditioned attics or crawlspaces, and older homes where the ducts have never been inspected or sealed in any meaningful way. It's also a strong fit for homeowners preparing to install a new furnace or air conditioner, since sealing the ducts first means the new equipment performs at something closer to its rated efficiency from day one.
Homes with unusually short, simple duct runs, or ductwork that's already been sealed and tested recently, may see a smaller benefit, which is exactly why the leakage test happens before any sealing decision gets made. This isn't a service sold on a blanket recommendation. It's sold based on what your specific ductwork actually measures.
A Natural Pairing With Unico Small-Duct Systems
Homeowners exploring Unico small-duct high-velocity systems, often because they own a historic Old North End or Manitou Springs home without existing ductwork, sometimes assume duct sealing doesn't apply to them. In reality, once small-duct tubing is installed, the same principles of airtight connections still matter for keeping conditioned air where it belongs. A & Z Mechanical's dual certification in both Unico installation and Aeroseal sealing means the same team that designs a small-duct retrofit understands duct airtightness from the ground up.
Military Families and PCS Timing
For military families stationed at Fort Carson, Peterson Space Force Base, or one of the other local installations, duct sealing is worth considering when moving into an older rental or purchased home in the area, particularly if early walkthroughs reveal uneven room temperatures. A & Z's 10% military discount applies to this service the same as it does to other HVAC work, which is worth mentioning when you request a quote.
Commercial Properties and Older Buildings
Small commercial properties in El Paso County, particularly older buildings with duct systems that predate current construction standards, deal with the same leakage issues as residential homes, often at a larger scale given the size of commercial ductwork. Uneven temperatures between offices or retail spaces, along with higher-than-expected utility costs, are worth investigating with a leakage test before assuming the HVAC equipment itself is undersized or failing.
FAQs
How much does Aeroseal duct sealing cost in Colorado Springs?
Cost depends on your home's duct layout, size, and current leakage level, which is why a comfort advisor measures your specific system before providing a number. Request a quote to get pricing based on your home rather than a generic estimate.
How long does an Aeroseal duct sealing appointment take?
Most residential Aeroseal sessions, including the initial leakage test, the sealing process, and the final measurement, are completed in a single day. Larger or more complex duct systems may take longer, which your comfort advisor can estimate after the initial inspection.
Is Aeroseal duct sealing covered by a warranty?
Aeroseal sealant is manufactured with a long-term performance warranty backed by the manufacturer, and A & Z Mechanical stands behind the installation as part of its 100% satisfaction guarantee. Ask your comfort advisor for the specific warranty terms that apply to your job.
Will Aeroseal duct sealing lower my energy bills?
Sealing leaky ducts reduces the amount of conditioned air wasted before it reaches your rooms, which typically means your furnace or air conditioner runs less to maintain the same comfort level. The exact savings depend on how leaky your system was to begin with, as shown in your before-and-after leakage report.
Can Aeroseal fix hot and cold spots without replacing my furnace or AC?
Yes, in many cases. Uneven room temperatures are often caused by duct leakage rather than equipment problems, so sealing the ducts can resolve the issue without any equipment replacement at all.
Conclusion
Leaky ductwork is one of the most common, least visible reasons a Colorado Springs home never quite feels comfortable no matter what the furnace or air conditioner does. It wastes conditioned air, drives up energy use, and creates the exact hot and cold spots that lead homeowners to blame equipment that's actually working fine. Aeroseal duct sealing addresses that problem directly, from the inside of ducts most sealing methods can't reach, and backs the result with an actual leakage report rather than a verbal promise.
A & Z Mechanical has served Colorado Springs homeowners since 2001, and as one of the only Aeroseal duct sealing certified contractors in the region, it's a service most local homeowners have never had properly explained to them, let alone offered. Whether your ducts run through a drafty Old North End attic, a Monument crawlspace, or a newer build in Falcon, the same honest diagnostics apply: measure first, explain what the numbers mean, and only recommend sealing when the leakage test actually supports it.
Get A Quote to have your ductwork tested and find out whether Aeroseal duct sealing can close the gaps causing your hot and cold spots. A comfort advisor will walk you through your home's actual leakage numbers before recommending anything.
