Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
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AfterFast, Reliable HVAC Cleaning Across Danville
HVAC cleaning in Danville means pulling Diablo Valley clay dust, oak pollen, and fine construction debris out of your system before it coats the evaporator coil and chokes airflow. Most Danville homes we service run $385 – $585 for a full HVAC cleaning that includes both supply and return ducts plus the coil and blower, priced as one flat rate per system, not per vent. Our HVAC Cleaning team covers every Danville neighborhood from Sycamore Valley to Tassajara Creek, and you’ll get a written price before any work begins. Call (737) 727-2314 and a live person answers, day or night.
Why Cardinal Air Duct Cleaning Is Danville’s Preferred HVAC Cleaning Company
Danville homeowners call us because we do the job the way it should be done the first time. We’re part of the Relay Home Co. family, founded 2005, and every booking runs on The Relay Standard: a live arrival window you can track from your phone, before-and-after photos of your own ducts, and a digital invoice you can tap to pay. No four-hour windows. No wondering who’s actually showing up.
Omar Haddad leads our Danville team, and the technicians who arrive at your door are background-checked, uniformed, and trained on professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies. We don’t run truck-mounted shop-vacs and call it a day. We use negative-pressure extraction with HEPA filtration, which means loosened debris goes straight into the vacuum, not back into your living room.
Every job carries the 365-Day Done Right Promise. If the work isn’t right within 365 days, we return and correct it at no charge. That’s not a marketing gimmick. It’s the longest satisfaction window in the trade, and it applies to every booking without exception.
Evaporator Coil Cleaning in Danville
Evaporator coil cleaning in Danville is the single most important part of an HVAC cleaning, especially in two-story homes near the Sycamore Valley hills where wind-driven dust off open space works its way into the return side. The evaporator coil is the part of your system that absorbs heat from the air. When it gets coated with clay dust and pollen, your system runs longer, pushes less cold air, and costs you more every month.
What a Coil Cleaning Actually Involves
We access the coil inside the air handler, apply a professional-grade coil cleaner, and flush the fins until they’re clear of buildup. On Danville homes with heavy oak pollen exposure, we’ll also apply a coil treatment to slow future buildup. This is not a job you want done with a garden hose. The coil sits inside the air handler cabinet, and the fins bend easily. A bent fin blocks airflow just like a dirty fin.
When You’ll Know It’s Time
If your AC runs constantly in July and August but the house never quite gets comfortable, the coil is the first place we look. Another tell is weak airflow at registers on the second floor while the first floor feels fine. In Danville’s summer heat, a dirty coil can add 15 – 20% to your cooling bill. Evaporator coil cleaning in this area typically runs $150 – $225 as part of a full system service, or $225 – $300 as a standalone job.
AC Duct Cleaning in Danville
AC duct cleaning in Danville homes means clearing the supply and return ducts of the fine dust that has been circulating through your system since the last time anyone looked. Most homes in the Diablo Valley’s summer dust corridor accumulate a surprising amount of material in the return plenum especially. The return side pulls in air from every room, along with whatever dust, pet hair, and pollen that air happens to carry.
Supply Side vs. Return Side
The return plenum and main return trunk are almost always the dirtiest part of a Danville two-story system. That’s where air rushes in at full velocity and drops whatever it’s carrying. The supply side gets dirty too, but in a different way: dust baked onto the duct walls over years of heated and cooled air cycling through. We clean both, but we pay special attention to the return because that’s where airflow problems start.
Construction Debris and Remodel Dust
Danville has a lot of homes that have been remodeled at least once. We recently worked a two-system home in the Tassajara Creek area where the upstairs registers were moving weak air. Camera inspection showed the return plenum was packed with construction debris and drywall dust from a remodel next door. Our tech cut the system into negative pressure with HEPA filtration, ran agitation tools through the supply and return ducts, cleaned the evaporator coil, and replaced the filter with a proper MERV rating. After photos of the ducts before and after went to the homeowner the same day. If your home was remodeled before you bought it, there’s a good chance the ducts were never cleaned afterward. AC duct cleaning here typically runs $385 – $585 for a complete single-system cleaning, supply and return included.
Trusted Brands We Service in Danville
We service every major HVAC brand you’ll find in Danville homes: Carrier, Trane, Lennox, Rheem, Goodman, Bryant, and everything else. We also carry a running stock of common filters and parts so we’re not waiting on a warehouse when your system needs a MERV 11 or 13 filter during pollen season. For filtration upgrades, we recommend products from Honeywell, Aprilaire, and Guardsman. The right filter media matters more than most people think, especially in Danville where spring oak pollen is heavy enough to leave a visible film on patio furniture.
Common HVAC Cleaning Problems We See in Danville Homes
- Clay dust baked onto evaporator coils. Danville sits directly in the path of summer dust that gets pulled into returns and caked onto coil fins by condensation. Once it bakes on, it doesn’t rinse off, it has to be mechanically cleaned.
- Return plenums packed with remodel debris. Homes in Blackhawk, Sycamore, and Greenbrook that were remodeled before or after purchase often have drywall dust, paint chips, or cut-offs sitting in the return. Cameras don’t lie, and we show you what’s in there.
- Second-floor airflow that never matches the first floor. Long duct runs to upper floors in Danville’s two-story homes lose velocity fast when ducts are restricted. The fix is cleaning, not cranking the fan speed.
- Filters with the wrong MERV rating. We regularly find furnace filters in Danville homes that are either too restrictive for the blower or too loose to catch anything. We’ll tell you the right one for your system and your household.
Pricing for HVAC Cleaning in Danville, CA
A complete HVAC cleaning for a typical Danville single-system home runs $385 – $585. That’s one flat price per system, agreed in writing before we touch a single duct. No per-vent pricing, no surprise add-ons at the door. Two-system homes, common in the larger properties near Sycamore Valley Road and the Tassajara Creek area, typically run $700 – $950 for both systems cleaned in the same visit. Evaporator coil cleaning as a standalone service runs $225 – $300. The price you see on the written estimate is the price you pay. Call (737) 727-2314 for a free estimate on your specific system.
We Also Serve Cities Near Danville
Our team covers the entire Danville area plus the surrounding East Bay communities. If you’re in HVAC Cleaning in Danville or nearby, we’re already working in your neighborhood. We also serve San Ramon, Clayton, Alamo, and Dublin, with the same flat per-system pricing and 365-Day Done Right Promise on every job.
Serving Danville, CA - Our Local Coverage Area
We’re based in the Danville area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About HVAC Cleaning in Danville
Every 3 to 5 years for most Danville homes, though homes near open space in Sycamore Valley or with pets may need it every 2 to 3 years. If you just completed a remodel or moved into a newly purchased home that was renovated, get the ducts inspected once. We’ll tell you honestly if cleaning isn’t needed yet. Call (737) 727-2314 and we’ll walk you through what to look for.
Flat rate per system, always. We quote one price for the entire system, supply and return, coil and blower included, before any work starts. Per-vent pricing is how companies quote a low number that multiplies fast, and it lets a tech skip the return plenum and air handler, which is the dirtiest part of a Danville two-story system. You’ll see our number in writing first.
Yes. Every Cardinal HVAC cleaning includes before-and-after camera photos of your own ducts, delivered the same day. You’ll see the return plenum, coil, and supply runs before we start and after we finish. That’s part of The Relay Standard, and it’s how you know the work was actually done, not just promised. Call (737) 727-2314 to book the same process for your system.
We don’t promise same-day service because real HVAC cleaning is a scheduled job that takes a few hours, not a drive-by. What we can tell you is that when you call, a live person answers and gives you the next available arrival window you can track from your phone. No voicemail loops. Call (737) 727-2314 and we’ll get you on the schedule.
We clean to NADCA standards using negative-pressure extraction with HEPA filtration, Rotobrush agitation tools, and Abatement Technologies containment where needed. That means loosened debris is drawn directly into a sealed vacuum, not blown around your home. We don’t use shop-vacs or cut corners on access. The work is backed by the 365-Day Done Right Promise on every visit.
Ready for an honest answer on your HVAC system? Call (737) 727-2314 and we’ll give you a free estimate with a flat per-system price, no per-vent math, and photos of your own ducts before and after the work. That’s how cleaning should work in Danville.
Written by Omar Haddad, Owner at Cardinal Air Duct Cleaning, serving Danville through The Relay Visibility Guarantee since the Relay Home Co. family was founded in 2005.