DUCT SEALING PROS · SERVICES
Duct Leakage Test St George: What to Expect and What the Numbers Mean
A duct leakage test St George homeowners can book measures how much air escapes from your ducts. It takes the guesswork out of sealing: you get a baseline number first, then a second number after the work, so the drop is proven.
What a duct leakage test St George homeowners get involves
The test connects a calibrated fan to your duct system, covers the registers, and pressurizes the ducts to a standard pressure. The fan has to keep supplying air to hold that pressure, and the amount it supplies is your leakage. We record the number, then inspect the system to find where it is escaping. The full method is on our page about how duct leakage is tested.
The test usually takes a short visit and does not require you to move furniture, though we need access to the air handler and any return grilles. If your ducts run through the attic, we will go up to inspect joints, boots and takeoffs.
Every duct leakage test St George technicians run should end with a number you can keep. If someone offers to seal your ducts without testing first, ask how they will know the job worked. Our overview of duct sealing methods explains how testing fits with sealing and repair.
How to prepare for your visit
- Tell us which rooms run hot or cold and when, so we know where to look first.
- Make sure we can reach the air handler, the return grilles and the attic hatch.
- Have your recent summer bills handy if you want to compare them with the result.
- Plan to be home so we can show you the gauge and explain the reading.
If you book during the hottest weeks, expect a busy schedule. The valley regularly sees 100°F or more from mid-June to mid-September, and HVAC service calls can take 24 to 48 hours then.
What the numbers mean and what happens next
| Result | What we recommend |
|---|---|
| High leakage, ducts intact | Seal with mastic and foil tape, with aerosol for hidden leaks, then retest |
| Large holes or disconnected runs | Repair first, then seal |
| Low leakage | No sealing needed. We tell you and you keep your money |
| Ducts in poor shape overall | Discuss replacement. See sealing versus replacing ducts |
The aim is not a number for its own sake. It is a measurable drop that you can see in the second test and, over the summer, in comfort and bills.
We also look at what the test cannot tell you. Leakage is one cause of rooms that never cool, but insulation, window exposure and equipment size matter too. If the numbers say your ducts are tight, we say so, and our guide to rooms that never cool covers the other likely causes.
Cost of a duct leakage test St George homeowners can expect
Angi lists a pressure test at about $300, with a range of $200 to $450. Some contractors fold the test into the sealing price, and others charge for it separately. Either way, ask for it as its own line in an itemized quote: testing, repairs, sealing and retest. Our duct sealing cost guide has the full published ranges.
A test also helps you decide whether sealing is worth doing at all. See is duct sealing worth it for how to weigh the savings.
Frequently asked questions
How long does a duct leakage test take?
Most tests are a short visit. Inspecting the attic for leak locations adds time, and sealing, if you go ahead, usually takes about 4 hours for most homes according to Angi.
Do I need a duct leakage test St George contractors offer before sealing?
You should. Without a baseline number, you cannot tell whether the sealing worked.
Will the test damage anything?
No. The test pressurizes the duct system with a fan and measures airflow. Nothing is cut or changed.
Can a leakage test tell me why one room is hot?
It tells you whether leakage is part of the cause. If the ducts test tight, we will say so and look at other causes.
Ready to find out where your cool air is going?
Call us and tell us which rooms are giving you trouble. We will explain what a duct leakage test involves and book your duct sealing services St George crews can finish before the next heat wave.
Duct Sealing Pros
3430 S River Rd, St. George, UT 84790
(435) 281-0395