Desert Dust and Your Ducts: What Nevada Homeowners Should Check First

Why dust questions come up so often in Nevada

All of Nevada is classified as dry on the climate zone map used for energy codes, and Clark County is hot-dry: under 20 inches of precipitation a year. Clark County's Division of Air Quality issued a dust advisory on Aug. 10, 2026, after thunderstorm winds blew dust into Southern Nevada. The advisory described airborne dust as a form of particulate matter and advised residents to keep windows and doors closed and run the air conditioner to filter out particulates.

With that much dust around, it's natural to see it on grilles and furniture and wonder about the ducts. The good news is that some simple checks tell you a lot before you pay for any cleaning.

Sources: PNNL / U.S. DOE Building America — Guide to Determining Climate Zones by County (PNNL-33270, 2022); Clark County Dept. of Environment and Sustainability — Air Quality Dust Advisory (Aug. 10, 2026)

A dusty grille isn't proof of dirty ducts

EPA says it is normal for return registers to get dusty as air is pulled through the grate, and that this doesn't indicate the ducts are contaminated with heavy deposits of dust or debris. EPA also notes that much of the dirt in air ducts sticks to duct surfaces and doesn't necessarily enter the living space.

• Wipe a return grille clean and note how quickly dust comes back. If it's fast, check the filter and its fit next.
• Remove a supply register cover and look inside with a flashlight. A light film is common; thick layers or debris are worth a closer look.
• Watch a supply register when the system starts. Debris actually blowing into the room is one of the conditions EPA lists for considering cleaning.

Source: U.S. EPA — Should You Have the Air Ducts in Your Home Cleaned?

Check the filter and its fit first

EPA recommends using the highest-efficiency filter your system's manufacturer recommends and changing filters regularly. If you upgrade, EPA suggests at least MERV 13, or as high a rating as your system fan and filter slot can accommodate, and says an HVAC technician can help you find the right one.

If you can see gaps around the filter in its slot, fix the fit before drawing conclusions about the ducts.

Sources: U.S. EPA — Should You Have the Air Ducts in Your Home Cleaned?; U.S. EPA — What is a MERV rating?

Leaky ducts can let dust in

ENERGY STAR estimates that about 20 to 30 percent of the air moving through a typical home's duct system is lost to leaks, holes, and poor connections, and that ducts often run through attics, crawlspaces, garages, and basements. It notes that dust and insulation particles can enter a duct system, and that sealing ducts reduces that risk.

If your ducts run through a dusty attic or garage and dust keeps coming back quickly, a leak may be part of the story. Cleaning removes what has built up; sealing is a separate job for an HVAC contractor.

Sources: ENERGY STAR — Duct Sealing; ENERGY STAR — Benefits of Duct Sealing

When cleaning makes sense, and what it won't do

EPA suggests considering duct cleaning when ducts are clogged with excessive dust and debris or particles come out of supply registers, when ducts are infested with vermin, or when there is substantial visible mold growth inside hard-surface ducts. It does not recommend routine cleaning, and it says duct cleaning has never been shown to actually prevent health problems.

When cleaning is warranted, ours removes accumulated dust and debris from the ducts, registers, and grilles we can reach. We don't apply biocides or sealants, and we don't diagnose or remediate mold.

Source: U.S. EPA — Should You Have the Air Ducts in Your Home Cleaned?