By Andy Kahn, co-owner, 32 Degrees AC & Furnace Repair
Desert homes get dusty. That’s life in Southern Nevada. But if a fresh dusting is covered again in two or three days, the filter is loaded within a few weeks, or you see dark streaks at the edge of the carpet, your HVAC system may be pulling in dirty air it was never supposed to touch. The usual culprit is a leak on the return side of the ductwork.
Cleaning ducts doesn’t fix that, and 32 Degrees AC & Furnace Repair doesn’t sell duct cleaning. What helps is finding the leak and sealing or repairing it.
Why the return side matters
Your system has two sides. Supply ducts push conditioned air into rooms. Return ducts pull room air back to the equipment through the filter. The return runs under suction, so any gap in it pulls in whatever air is nearby: attic air with insulation fibers, garage air, or dust from inside a wall.
Worse, a lot of that leakage happens after the filter or around it, so the dirt goes straight to the coil and back out the vents.
Signs of a return leak
- Dust comes back fast, especially near supply registers
- The filter clogs much sooner than its rating
- A whistle or rush of air near the return grille or the air handler closet
- Dark lines on carpet at doorways and baseboards (air being pulled through gaps)
- A dirty indoor coil despite regular filter changes
- Garage or attic smells inside when the system runs
Where leaks hide in Las Vegas homes
- Filter grilles and filter slots that don’t seal, letting air bypass the filter.
- Panned returns, where a wall or floor cavity is used as the duct. Common in older Valley homes and very leaky.
- Flex duct connections in the attic where tape has failed after years of 140-degree summers.
- The platform or plenum under the air handler, with gaps open to the garage or closet.
What you can do now
Use a filter that fits snugly and is the right size. Check that the filter door or grille closes tight. Look at the filter after two weeks; if it’s already gray, note it for the technician. Don’t block return grilles with furniture.
How we fix it
A technician inspects the return path from the grille to the equipment, looks for bypass around the filter, checks the plenum and platform, and checks static pressure. Repairs can mean sealing joints with mastic, rebuilding a leaky platform, replacing a damaged return run, or upgrading a panned return to a real duct. You get the findings and options before work starts. Larger problems may point to our ductwork repair or ductwork installation service.
Next step
If your house is dustier than it should be, call 32 Degrees AC & Furnace Repair at 702-635-9505 or book online. We answer 24/7 and serve Las Vegas, Henderson and North Las Vegas.
NV License #0088234