You keep your thermostat at 76°F all summer. You’re not running the AC any harder than last year. But somehow your July power bill just hit $280. Here’s what probably happened: 25-30% of that expensive cooled air is leaking into your attic through ductwork gaps.
The EPA estimates that leaky ducts cause typical homes to lose 20 to 30 percent of conditioned air. That’s significant energy waste. In Utah, where summer temperatures hit 90°F+ and your system works harder at altitude, that waste adds up fast.
We’re going to show you the actual math. You’ll see what you’re losing every month, what it costs to fix it, and why this is one of the highest-ROI improvements you can make.
If you suspect your ducts are leaking, give us a call at (801) 997-1617. We’ll inspect your system and show you exactly where your money is going.
How Much Money Leaky Ducts Actually Waste in Utah
Let’s do the math with real Utah numbers. The average summer cooling bill for a typical home runs $150 to $250 per month during peak season. Rocky Mountain Power’s current rate is about 14¢ per kilowatt-hour.
With ducts leaking 25% of your cooled air (right in the middle of the EPA’s range), you’re throwing away $37 to $62 every single month.
That’s $450 to $750 per year in leaky ducts energy waste. Gone.
Not into the rooms where you’re trying to stay cool — into your attic, your crawlspace, the space between your walls. Your AC produces the cold air, your ducts deliver maybe three-quarters of it, and the rest? You paid for it, but it never reached you.
Rocky Mountain Power raised rates 15% since last summer. And during peak hours (3pm to 10pm, Monday through Friday, June through September), you’re paying the highest rates of the year. Those are exactly when your AC runs hardest.
Compare that waste to what it costs to fix. Duct sealing pricing varies based on the method, system size, and extent of leakage — call us for a detailed quote after we assess your system.
The payback on duct sealing is fast — typically a few years just from duct sealing savings alone. And that’s before you factor in comfort, reduced equipment wear, and longer system life.
Two paths: keep paying hundreds a year in wasted energy, or seal the ducts once and stop the bleeding. One option makes Rocky Mountain Power richer. The other makes your home more comfortable and your HVAC system more efficient.
Why Utah Homes Lose More to Duct Leaks
Utah’s climate makes duct leaks especially expensive. Start with altitude. At higher elevations — Park City, Bountiful, parts of the Wasatch Front — the air is thinner. Your HVAC system already works harder to move the same volume of air compared to a system at sea level.
When you add leaks to that equation, the efficiency loss compounds by up to 30%.
Then there’s the temperature swings. A 90°F day in Salt Lake drops to 60°F at night. That creates condensation stress on your duct joints — expanding during the day, contracting at night, moisture forming on the seams. Over time, that stress opens gaps.
Flex duct connections pull apart, mastic cracks, and joints that were sealed five years ago aren’t sealed anymore.
Utah’s dusty climate makes leaky return ducts a bigger problem. When return ducts leak, they pull in air from wherever they’re located. If that’s your attic during an inversion, you’re sucking dust, insulation particles, and whatever else is up there straight into your home. That’s why your house stays dusty no matter how much you clean.
Those return ducts are bypassing the filters entirely.
And with 220+ sunny days a year, your cooling season isn’t three months — it’s closer to five. Split-level homes in Utah Valley with long duct runs? Older homes in Salt Lake Valley with original 1970s ductwork? Those are the systems we see leaking the most after 20+ years serving Wasatch Front homes.
5 Signs Your Ducts Are Leaking Money
Most of your ductwork is hidden, but the symptoms aren’t.
Rooms that never reach the thermostat temperature. Your thermostat says 76°F, but your bedroom says 81°F. You’ve tried closing vents in other rooms, adjusting the dampers, even moving the thermostat — nothing works. That’s usually not an AC problem.
It’s a delivery problem. If the duct feeding that bedroom has a major leak, you’re conditioning your attic instead of your bedroom.
Your AC runs constantly but the house stays warm. The compressor never shuts off, the air from the vents feels cold, but the temperature barely drops. That’s classic duct leakage — your system is producing plenty of cold air, it’s just not delivering it. (If it’s 95°F+ outside, continuous operation can also just be physics — see our breakdown of why your AC struggles in 95°F Utah heat to tell the difference.)
Your home is dusty no matter how much you clean. You vacuum on Monday. By Wednesday, there’s dust everywhere again. That’s often a leaky return duct pulling unfiltered air from the attic or crawlspace.
Every time your system runs, it’s distributing that dust through your home.
Utility bills climbing while your usage stays the same. You haven’t changed your thermostat settings, you’re not running the AC more, but the bills keep going up — not just by the 15% rate increase. If your bills have jumped 25% or more, leaks are a likely contributor.
Visible disconnected or damaged ducts. If you go up into your attic and see a duct section that’s come loose, you’re looking at the leak. Same goes for a flex duct sagging and pulling apart, or mastic that’s cracked and peeling. Not every leak is visible, but if you can see damage, you definitely have a problem. For a more thorough look at what an HVAC duct inspection involves, check out our guide on ductwork inspection in Utah.
Duct Sealing Options: Costs and ROI for Utah Homeowners
You’ve got two main options: manual sealing and Aeroseal. Both work. They just work in different ways, cost different amounts, and make sense for different situations.
Manual Duct Sealing
Manual sealing is the traditional approach. A technician goes into your attic or crawlspace, finds the accessible duct joints, and seals them with mastic and metal-backed tape.
Cost varies based on system size and how much leakage we can reach — typically priced after inspection. Call us for a detailed quote.
Effectiveness: 10 to 30% leak reduction. Manual sealing fixes the leaks you can see and reach, but a lot of leaks are buried inside walls, above ceilings, or in areas too tight to access.
Best for: Older systems with major visible damage. If you’ve got a disconnected boot, a torn flex duct, or a joint that’s completely separated, manual sealing will fix those problems fast.
Aeroseal Duct Sealing
Aeroseal seals ducts from the inside. A technician pressurizes your duct system with a fog of sealant particles. The particles seek out the leaks and build up on the edges of the holes until they’re sealed. It can reach leaks that manual sealing can’t — inside walls, above finished ceilings, anywhere air is escaping.
Cost varies based on system size and how much leakage we measure. We price it after inspection once we see how accessible your ducts are.
Effectiveness: 70 to 95% leak reduction. Aeroseal closes almost all the leaks in your system. Before-and-after testing shows exactly how much leakage you started with and how much is left.
Best for: Newer systems with hidden leaks, or homes where major sections of ductwork aren’t accessible. If your ducts are above a finished ceiling or inside walls, Aeroseal is often the only way to seal them without tearing into drywall.
Ready to get your ducts sealed? Learn more about our duct sealing and cleaning services or call (801) 997-1617 for a free inspection.
DIY Duct Sealing: Worth It?
Probably not. You can buy mastic and foil tape at the hardware store and seal the joints you can see. But most of the leaks aren’t where you can see them. And even if you seal the visible ones, you won’t know how much leakage is left.
Also, duct tape doesn’t work — and we know it’s called duct tape. The adhesive dries out in the heat and peels off within a year or two. Utah building code requires all duct sealing to meet UL 181A or UL 181B standards. Duct tape doesn’t meet those standards.
Want to know if you’re dealing with leaky ducts? Give us a call at (801) 997-1617. We’ll pressure-test your system and show you exactly where you stand.
When to Seal Your Ducts (and Why Spring Matters)
Ideal time to seal your ducts? Before the peak summer heat hits in June, July, and August.
Seal your ducts in May and your cooling season runs June through September — you capture the savings for the entire peak season. Wait until July, and you’ve already burned through two months of waste at the highest rates of of the year. Rocky Mountain Power’s peak hours kick in starting in June, and every wasted kilowatt-hour during those windows costs more.
Scheduling is easier in spring, too. July and August are our busiest months — everybody’s AC is breaking, everybody needs service, and lead times stretch out. Spring is when we’ve got availability to do a thorough inspection and sealing job without rushing to the next emergency call.
If you’re doing this as part of your spring maintenance, it pairs well with an AC tune-up. Clean coils, check refrigerant, inspect electrical connections, and seal the ducts all in one visit.
Frequently Asked Questions About Duct Leaks
How can I tell if my ducts are leaking?
Rooms that don’t reach the right temperature, an AC that runs constantly, rising bills, and excessive dust are the most common signs. A professional pressure test will tell you exactly how much leakage you have.
How much does duct sealing cost in Utah?
Duct sealing costs vary based on the method, system size, and extent of leakage. We provide detailed quotes after inspecting your system and measuring the leakage.
Is duct sealing worth the investment?
Yes. If you’re wasting hundreds per year on leaky ducts, even a moderate investment in sealing pays for itself within a few years. After that, the savings keep coming. You’re also reducing wear on your equipment, which can extend the life of your AC by years.
What’s the difference between Aeroseal and manual duct sealing?
Manual sealing fixes the leaks a technician can reach from the outside — joints in the attic, visible damage, disconnected sections. Aeroseal seals from the inside using pressurized sealant particles, so it reaches hidden leaks that manual sealing can’t. Manual typically reduces leakage by 10 to 30%, while Aeroseal reduces it by 70 to 95%.
Can I seal my ducts myself?
You can seal the visible joints using mastic and foil tape (not duct tape). But most leaks are hidden. Without pressure testing, you won’t know how much leakage you’ve actually eliminated. Professional sealing includes before-and-after testing, code-compliant materials, and access to methods like Aeroseal.
Does Rocky Mountain Power offer rebates for duct sealing?
Yes. Rocky Mountain Power offers rebates up to $300 for qualifying duct sealing projects. The exact rebate depends on the verified energy savings and whether your project meets their requirements. We can help you navigate the rebate application process.
Will duct sealing lower my energy bill?
If your ducts are leaking, yes — absolutely. Sealing those leaks means more of the air your AC produces actually reaches your rooms, so your system doesn’t have to run as long. That translates directly to lower bills — typically $300 to $600 per year in savings for a Utah home with moderate leakage.
Stop Paying for Air You’ll Never Feel
Leaky ducts are easy to ignore until you see the math. $600 per year sounds abstract until you realize that’s two mortgage payments or three months of groceries.
Sealing your ducts isn’t glamorous. It won’t change the look of your home. But it’s one of the highest-ROI improvements you can make — a fast payback, lower bills every month after that, and a more comfortable home. Your AC system won’t have to work itself to death compensating for leaks.
Give us a call at (801) 997-1617 and we’ll come take a look. We’re a family-owned company with 20+ years serving Utah homes, and every technician is Utah state licensed. We’ll pressure-test your ducts, show you exactly how much air you’re losing, and walk through your options. The $49 dispatch fee is waived if you go ahead with the work, and if you qualify for the Rocky Mountain Power rebate, we’ll help you apply.
That July power bill doesn’t have to hit $280. Let’s fix the ducts and keep that money in your pocket.
