Here’s something we see all the time once the weather turns: a furnace or heat pump that runs fine, a thermostat that’s set right, and a heating bill that still doesn’t make sense. The equipment gets blamed. But a lot of the time, the real problem is hiding in the attic or crawlspace — the ductwork.
In a typical older home around Winder, Statham, or Lawrenceville, the duct system leaks a lot more than people expect. Every gap at a joint, every crushed flex run, every boot that’s pulled away from the floor is heated air you paid for blowing into a space nobody lives in. With the first real cold snaps hitting Northeast Georgia, late October is when those leaks start costing you.
How duct leaks show up in a Georgia home
You usually don’t see a duct leak. You feel the side effects. The back bedroom never quite warms up. The system runs longer than it used to. The house gets dusty fast, or you smell a little of that musty crawlspace odor when the blower kicks on.
That last one matters more than people realize. Leaky return ducts don’t just lose air — they pull air in. In a vented crawlspace, that means your system can be breathing in damp, dusty air from under the house and mixing it into what you breathe upstairs. Georgia crawlspaces in a wet fall are not where you want your air coming from.
And if you read our recent post on why some rooms stay cold while others are fine, ductwork was high on that list for a reason. A supply run that’s leaking half its air before it reaches the room will never heat that room properly, no matter what the equipment is doing.
What duct testing actually tells you
We don’t like guessing, and you shouldn’t pay for guessing either. A proper duct test puts a number on the problem. We seal off the registers, pressurize the duct system with a calibrated fan, and measure exactly how much air is escaping. It’s the same style of testing used for new-construction energy code compliance, done on your existing house.
Once we have that number, the conversation gets simple. A tight system needs nothing. A moderately leaky one might just need a few joints sealed and a couple of boots reconnected. A system losing a quarter of its air — and yes, we find those — is worth sealing properly, and sometimes worth rerouting or replacing the worst sections.
Sealing it right
Real duct sealing is not a roll of the silver tape they sell at the hardware store. That stuff dries out and falls off in an attic within a couple of summers — it’s about the only thing “duct tape” is bad at. Depending on the system, we use mastic sealant on joints and seams, proper mechanical connections, and sealed, insulated boots where ducts meet the floors and ceilings.
A few things come out of a good test-and-seal visit:
- Rooms that were always a few degrees off start evening out, because the air actually arrives where it’s supposed to.
- The system runs shorter cycles, which shows up on the power bill and takes strain off the equipment heading into winter.
- Less dust and crawlspace air getting pulled into the house, which your filters and your sinuses will both notice.
If you’re planning on new equipment in the next year or two, it’s smart to test the ducts first. We’d rather connect a new system to tight ductwork than watch a brand-new unit fight the same old leaks. You can read more about the service itself on our duct testing and sealing page.
When to have it done
Right now is the best window for this work. Attic work in a Georgia July is miserable for everyone involved, and by January the leaks are costing you every single day. Fall is also when we’re already in a lot of homes for heating checkups, so pairing a duct test with a seasonal visit is easy to schedule.
We handle duct testing and sealing across our whole service area — Winder, Statham, Athens, and over into Gwinnett County. If you’re in Lawrenceville or the surrounding neighborhoods, we’re out that way just about every day.
Frequently asked questions
How do I know if my ducts are leaking?
Common signs are rooms that won’t stay warm, heating bills that climb without the weather explaining it, excessive dust, and a system that seems to run constantly. The only way to know for sure is a duct leakage test, which measures exactly how much air the system is losing.
Is duct sealing worth it on an older home?
Usually, yes — older homes around Northeast Georgia are where we find the worst leakage, and they see the biggest improvement. Sealing makes the home more comfortable and lets the existing equipment do its job, which often postpones the need for bigger repairs or replacement.
How long does duct testing and sealing take?
Testing itself typically takes an hour or two. Sealing depends on what the test finds and how accessible the ductwork is — many homes are done in a single visit, while a system that needs sections replaced may take a return trip. We’ll give you a clear picture before any sealing work starts.
Suspect your ducts are wasting heat this winter? Call American Comfort Heating and Cooling at 678-203-6336 or request an estimate online and we’ll put a number on it.
