Fast, Reliable Air Quality & Ventilation Across Los Altos
Whole-home air filtration and ventilation upgrades in Los Altos typically run $2,800–$6,500 and almost always require ductwork replacement due to California Title 24 testing requirements. We’re Stonegate Heating & Air California, and our Air Quality & Ventilation team makes the drive down Interstate 280 to Los Altos regularly from our Sacramento base. We’ve learned that Los Altos homeowners don’t want surprises, they want the job done in one trip with owner supervision. That’s exactly how Jason Trent runs every project.
Call us at (855) 467-1888 for a free estimate on your Los Altos home’s air quality needs.
Why Stonegate Heating & Air California Is Los Altos’s Preferred Air Quality & Ventilation Company
We’ve built our reputation over 16 years in California’s HVAC market, and Los Altos homeowners have been part of that story. Our 499 verified reviews averaging 4.7 stars include plenty from Santa Clara County customers who found us through referral or research, not advertising. They mention the same things: Jason Trent showed up on their job site as Field Supervisor, not just sent a tech from a dispatch pool.
Los Altos sits at the base of the Santa Cruz Mountains foothills, slightly warmer and more sheltered than cities directly on the Bay floor. Summer afternoons regularly hit the mid-to-upper 80s°F and occasionally spike past 100°F during heat dome events. That “almost need AC” climate, combined with the Bay Area’s wildfire-smoke transport zone, has made whole-home air filtration our fastest-growing request from the 94022, 94023, and 94024 ZIP codes.
Our familiarity with Los Altos’s dominant housing stock matters. These 1,400–2,200 square foot single-story ranch homes on large, tree-canopied lots were built between 1950 and 1975 with original sheet-metal duct runs designed only for heating. When we quote an air quality upgrade, we’re already accounting for the duct-leakage test and probable replacement. No bait-and-switch. Homeowners on Covington Road, in South Los Altos near Grant Park, and up in the North Los Altos hills near the Country Club all get the same upfront assessment.
Our Air Quality & Ventilation Services in Los Altos
Air Filtration Systems
Los Altos lies squarely in the Bay Area’s wildfire-smoke transport zone, and since 2017 that’s been the primary driver for whole-home filtration upgrades. A portable unit won’t cut it when smoke lingers for weeks. We install MERV-13+ media filters and Carrier Infinity air cleaners that integrate with your central duct system, capturing particulates that slip through standard 1-inch throwaway filters. But here’s the catch: if your 1960s ducts are leaking 35% into the attic, that filtered air never reaches your living space. We test first, then filter.
Humidifier Installation
Los Altos’s sheltered foothill position means drier winter air than coastal Bay Area cities. Original ranch homes with single-speed gas furnaces blast dry heat through undersized ducts, leaving hardwood floors gaping and sinuses irritated. We install whole-home humidifiers on Carrier, Trane, and Lennox systems, properly sized to your home’s square footage and duct capacity. On homes near Foothill Expressway where mature oak canopy blocks afternoon sun, humidity control becomes even more critical for comfort.
Dehumidifier Installation
The same foothill geography that warms Los Altos can trap moisture in homes with poor ventilation, particularly in additions built over crawl spaces or garages. We’ve seen this repeatedly in expanded ranch homes near Homestead Road where room-by-room additions never got proper return air pathways. A whole-home dehumidifier integrated with your HVAC system solves what opening windows can’t, especially during spring marine layer events that roll in from the Bay.
UV Air Purifier Installation
UV-C lamps installed at the evaporator coil address mold and microbial growth, a real concern in Los Altos homes where original ductwork creates condensation traps in attic plenums. The combination of tree-canopied lots, mature landscaping, and 60-year-old metal ductwork produces exactly the dark, humid conditions where biological growth thrives. We specify UV systems from major manufacturers and coordinate installation with any required duct modifications.
ERV/HRV System Installation
Energy Recovery Ventilators and Heat Recovery Ventilators are the right solution for Los Altos’s tight, retrofitted homes. When we seal and replace original leaky ductwork, we improve efficiency but can inadvertently trap stale indoor air. An ERV exchanges fresh outdoor air while recovering heating or cooling energy, critical for homes that now have tight building envelopes but no designed ventilation strategy. This is increasingly specified in North Los Altos renovations where homeowners want modern IAQ without sacrificing the energy gains from their gut-rebuild investment.
Ventilation System Installation
Proper ventilation in Los Altos means more than a bath fan. It means calculated fresh air intake, exhaust balancing, and duct sizing that accounts for your home’s actual layout, not its 1962 blueprint. We design ventilation systems for homes that have been expanded room-by-room without upgrading the original duct infrastructure, a pattern we see constantly in the 94024 area.
What happens when you call
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A real person answersNo phone trees — you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Los Altos
We’re factory-trained or experienced on nine major HVAC brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. For Los Altos customers, this means we don’t show up and tell you “we don’t service that brand.” We stock common parts for Carrier and Trane systems, the two brands we see most often in Los Altos’s higher-end renovation market, and we can source Lennox components quickly through our supplier network. Whatever equipment is in your ranch home’s closet or attic, we’ve worked on it. That fluency saves you a day or two of delay when you need filtration or ventilation work done on a compressed renovation timeline.
Common Air Quality & Ventilation Problems We See in Los Altos Homes
- Original ductwork leaking 30–40% of conditioned air into unconditioned attic space. This renders any air filtration investment nearly pointless. Conditioned, filtered air never reaches your rooms; it heats or cools your insulation instead. We find this in virtually every pre-1975 Los Altos ranch we inspect.
- Addition-to-original-home duct runs are undersized, starving new rooms of ventilation. The 1962 system was designed for 1,600 square feet, not your current 2,400 with the master suite addition. We see this constantly near Grant Park and in South Los Altos expanded ranches where new rooms sit stagnant while the original core over-cools.
- Many homes lack return air pathways when interior doors are closed. Original Los Altos ranch design assumed doorless floor plans. Close a bedroom door now and you’ve created a pressure imbalance that pulls garage fumes, attic dust, or crawlspace moisture into living space through every available crack.
- Wildfire smoke season exposes the gap between portable purifiers and whole-home systems. Los Altos’s position in the smoke transport zone means multi-week events. Portable units manage one room, loudly, with constant filter expense. Whole-home MERV-13+ filtration with proper duct sealing is the only approach that protects every room, every hour, without the noise and maintenance burden.
Pricing for Air Quality & Ventilation in Los Altos, CA
Here’s what Los Altos homeowners actually pay for our most common air quality and ventilation work. These ranges reflect the reality that most projects require duct replacement due to Title 24 leakage-test failures:
| Service | Typical Range in Los Altos |
|---|---|
| Whole-home air filtration upgrade (media cleaner + duct sealing) | $2,800–$4,200 |
| UV air purifier installation | $800–$1,600 |
| Whole-home humidifier or dehumidifier | $1,200–$2,800 |
| ERV/HRV system installation | $3,500–$6,500 |
| Full duct replacement with air quality package | $5,500–$9,500 |
| AC Repair | $150–$650 |
| AC Installation | $3,500–$7,500 |
| Tune-Up | $80–$200 |
What drives cost up or down? Duct accessibility in your attic or crawlspace, whether your electrical panel needs upgrading for ERV power, and how many zones your home requires. The full duct replacement with air quality package is the most common scenario we quote in Los Altos, not because we’re pushing it, but because Title 24 mandates it once leakage exceeds thresholds. We always perform the test before quoting, so you know exactly why the scope is what it is.
Call (855) 467-1888 for a free estimate. We’ll run the duct-leakage test, show you the numbers, and build a scope that matches your home’s actual condition.
We Also Serve Cities Near Los Altos
Our service area extends throughout the Peninsula and South Bay. We regularly work in Los Altos Hills on larger acreage properties with detached guest houses, Mountain View on the Eichler and ranch stock closer to the Bay, Stanford on faculty housing and university-adjacent renovations, and Sunnyvale on the full spectrum from original 1960s ranches to new construction. Each city has its own building stock patterns and code enforcement quirks; we adjust our approach accordingly.
Serving Los Altos, CA — Our Local Coverage Area
We’re based in the Los Altos 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 — Air Quality & Ventilation in Los Altos
No. In our experience across Los Altos, original 1950s–70s sheet-metal and early flex ductwork fails Title 24’s leakage standard virtually every time, typically leaking 30–40% of airflow into unconditioned attic space. The test is mandatory whenever HVAC equipment is replaced or significantly modified, and failure triggers required replacement. We run the test during our initial assessment so you know before work begins. Call (855) 467-1888 to schedule.
Your original duct system was sized for the 1962 footprint, not the expanded square footage. We see this constantly in Los Altos ranches where room additions were tied into existing trunk lines that can’t carry adequate CFM. The addition starves while the original core over-conditions. Proper fix: resize the trunk, add dedicated returns, and rebalance the system. We recently serviced a 1962 ranch home on Covington Road where the homeowner wanted a MERV-13 whole-home filtration system to combat wildfire smoke. During the duct-leakage test required by Title 24, we found that the original sheet-metal ducts were leaking at 35%, forcing a complete duct replacement. We installed a Carrier Infinity air cleaner and rebalanced the system to ensure the addition above the garage finally received adequate airflow.
A portable unit will reduce particulates in one room, but it won’t protect your whole home during multi-week Bay Area smoke events, and it does nothing about the duct leakage that’s pulling attic air into your living space. Whole-home MERV-13+ filtration with sealed ductwork is the only approach that addresses both the smoke source and the infiltration path. Los Altos’s position in the wildfire-smoke transport zone makes this a genuine health infrastructure decision, not a convenience upgrade. Call (855) 467-1888 for an assessment of your current system’s smoke readiness.
We mount the core unit in attic or closet space, run dedicated intake and exhaust ducts to exterior walls, and tie into your existing return ductwork. In Los Altos ranches, the challenge is usually finding a path through the original structure without damaging the character features homeowners want to preserve. We coordinate with your general contractor on renovation timelines, since most ERV installations happen during gut rebuilds when walls are open. Typical timeline: 1–2 days for equipment install, plus any required electrical upgrades.
Most Los Altos ranch homes require 2–3 days for complete duct replacement, assuming standard attic access and no structural surprises. Homes with multiple additions, finished attics, or tight crawlspaces near Foothill Expressway can stretch to 4 days. We work with your schedule and any active renovation timeline, since many of our Los Altos jobs are coordinated with general contractors on compressed schedules. Jason Trent supervises each project personally to keep timing on track.
Written by Jason Trent, Owner and Field Supervisor at Stonegate Heating & Air California, serving Los Altos and the greater Sacramento region since 2008.