HVAC Installation from a Licensed Silicon Valley HVAC Contractor
Manual J takes about three hours per home if done correctly. We model every exterior wall by orientation, R-value, and window U-factor and SHGC; calculate infiltration based on year-of-construction defaults adjusted for visible weatherization; account for internal gains from occupants and equipment; and produce a room-by-room sensible and latent load. The result almost always shows a smaller equipment size than the previous installer specified. A typical 2,200 sq ft Palo Alto Eichler with R-19 walls (we frequently find R-11 in original construction), dual-pane retrofitted windows, and a 12-foot ceiling profile loads at about 28,000 BTU/hr cooling — a 2.5-ton system. The old installer put in a 4-ton because that is what fit the rule of thumb. The 4-ton short-cycles, never dehumidifies, and wears the compressor faster.
Equipment pairing matters more than brand prestige. A premium variable-speed Carrier Infinity 26VNA6 paired with a single-stage furnace and a non-communicating thermostat loses most of its modulation benefit. We design matched systems: variable-speed Carrier Infinity inverter compressor + Carrier 59MN7 modulating furnace + Carrier Infinity touch thermostat with the green wire C connection completes the communicating loop. Or for heat pump conversions, a Mitsubishi Hyper-Heat outdoor unit + matched air handler + Kumo Cloud thermostat with proper outdoor sensor placement so the outdoor temperature compensation works correctly down to the 28°F design temperature in Portola Valley and the Santa Cruz mountain foothills.
Ductwork is where most installations fail in the Bay Area. Original 1960s and 1970s flex duct in Palo Alto attics is typically R-4.2 with degraded inner liner, 6-inch trunks where 8 should be, and saddle-tap branches that leak 25-35% by Aeroseal pre-test measurement. Title 24 Part 6 requires duct leakage under 5% of nominal airflow on full system replacements, verified by a HERS rater with a duct blaster. We rarely meet that on existing ductwork without remediation. Our standard installation includes Aeroseal aerosol sealing or, on systems where flex duct is past serviceable life, full duct replacement with R-8 insulated metal trunks and R-6 flex branches, hard-piped to UL-181 standards with mastic seal — never tape.
The 2022 Title 24 update plus the IRA 25C federal credit plus TECH Clean California has shifted the economics decisively toward heat pump conversion for most Bay Area homes. A natural gas furnace + AC replacement runs $14,000-$22,000 installed for a quality variable-speed pair. A heat pump conversion with the same comfort tier runs $18,000-$28,000 installed but stacks $2,000 federal IRA 25C + $1,000-$3,000 TECH Clean + $1,000-$5,000 BayREN + SVCE/PCE rebates of $500-$3,000 — net cost often lower than the gas system after incentives. Plus the home is on a single fuel, simpler to service, eligible for cheaper rate plans (PG&E E-ELEC), and ready for Palo Alto and other municipal reach codes that are progressively restricting new gas appliances. We model both options for every full-system customer.
What's Included in Every HVAC Installation Job
- ACCA Manual J load calculation per room (not square-footage shortcut)
- Manual S equipment selection matched to actual load
- Manual D duct design for static pressure, throw, and balance
- Title 24 Part 6 (2022) compliance documentation
- HERS rater coordination — duct leakage, refrigerant charge, fan watt draw
- Building permit pull and inspector coordination
- Aeroseal aerosol duct sealing OR full duct replacement to R-8/R-6 insulation
- Electrical panel load calc and coordination with licensed electrician
- PG&E, IRA 25C, TECH Clean California, BayREN, SVCE/PCE rebate filing
- Combustion air verification and CO testing on gas equipment
- 10-year manufacturer parts warranty + 5-year labor warranty on full systems
- Floor protection, dust containment, and post-install commissioning report
Common HVAC Installation Issues We Resolve
Existing system is mismatched (new AC on 25-year-old furnace)
Cause: Previous contractor swapped one component and left the other; SEER mismatch loses efficiency
Fix: Full matched system replacement with communicating controls — $14,000-$22,000 installed
Ductwork is leaking 25%+ of conditioned air
Cause: Flex duct degradation, saddle-tap branches, missing mastic at boots and plenum
Fix: Aeroseal aerosol sealing $1,800-$3,500 or full duct replacement $5,500-$12,000 depending on scope
Electrical panel cannot support heat pump conversion
Cause: 100A panel typical in 1950s-1970s Bay Area construction; insufficient for 60A heat pump load
Fix: Coordinated panel upgrade to 200A with licensed electrical partner — $3,500-$6,500 separate scope
Two-story home has 8-12°F temperature differential between floors
Cause: Single-zone system cannot address differential load; upstairs always hotter in summer, cooler in winter
Fix: Two-zone variable-speed install with motorized dampers — $2,800-$4,500 add to base install
Combustion air supply inadequate for 95% AFUE installation
Cause: Existing combustion air pulls from confined garage or closet; new sealed-combustion units need PVC intake
Fix: PVC concentric or two-pipe combustion air rough-in — included in our installation scope
Our HVAC Installation Process
In-Home Design Visit
90-120 minute visit: Manual J load calc, ductwork inspection with smoke pen and visual leak check, electrical service evaluation, combustion air verification, equipment options walk-through.
Written Design Proposal
12-18 page proposal with 2-3 equipment tiers (gas + AC, heat pump, premium variable), Manual J output, room-by-room load table, all rebates documented, financing options.
Permitting & Pre-Build
Pull mechanical permit, electrical permit if panel work needed, schedule HERS rater, coordinate equipment delivery. Lead time 7-14 business days typical.
Installation (2-5 days)
Day 1: tear-out, refrigerant recovery, electrical work. Day 2-3: equipment set, ductwork, line set, condensate. Day 4-5: commissioning, Aeroseal if scope, smart thermostat config.
HERS, Inspection & Rebates
HERS rater visit (separate appointment), building inspector visit, all rebate paperwork filed. Federal credit appears on your tax return; cash rebates land 6-12 weeks post-install.
HVAC Installation Pricing in the Bay Area
Typical hvac installation pricing in our Silicon Valley service area runs $14 000 – $35 000 full system installed. Most jobs complete in 2-5 days for installation; 1-2 weeks for HERS; 4-8 weeks for permit close-out.
Every quote is flat-rate and provided in writing before work begins. Diagnostic fees are waived when repair is approved. We never use time-and-materials billing surprise pricing.
Local Context: HVAC Installation in Silicon Valley
Climate Zone 3 (San Francisco peninsula and coast) and Climate Zone 4 (south bay and Santa Clara Valley) drive different installation priorities. Coastal homes in Pacifica, Half Moon Bay, and the San Mateo coast face severe salt-air corrosion on outdoor coils — we specify aluminum-fin/aluminum-tube (Aluminall) condensers or full coastal-coating treatment, and recommend annual fresh-water rinses. Inland homes in San Jose, Sunnyvale, Cupertino, and the East Bay see real cooling demand and benefit most from variable-speed equipment. Heat pump conversion is increasingly favored because Palo Alto, Berkeley, San Francisco, and other municipalities have adopted reach codes restricting new gas appliances; PG&E E-ELEC rate plans give all-electric homes substantially lower energy costs; and Title 24 Part 6 (2022) all but mandates heat pumps for new construction. Eichler-tract installations require special handling — radiant slabs cannot be repurposed, so we typically specify Mitsubishi Hyper-Heat ducted ceiling cassettes or hybrid mini-split + small-duct high-velocity systems (SpacePak, Unico) that route through the limited attic space available in flat-roof Eichlers.
HVAC Brands We Service for HVAC Installation
HVAC Installation FAQ
What does a full HVAC system installation actually include?
Furnace (or heat pump air handler), AC condenser (or heat pump outdoor unit), evaporator coil, refrigerant line set, condensate drainage, smart thermostat, all ductwork that needs replacement or sealing, electrical disconnects, gas line modifications, combustion air, building permits, Title 24 documentation, HERS verification, and rebate paperwork. The price quoted is the total project cost — not a teaser that grows with adders.
Should I do a heat pump conversion or replace gas + AC like-for-like?
For most Bay Area homes built 1960-2010, heat pump conversion is now the better economic choice after stacking IRA 25C ($2,000) + TECH Clean ($1,000-$3,000) + BayREN ($1,000-$5,000) + SVCE/PCE ($500-$3,000) rebates. The exception is homes with very poor envelope (R-11 walls, single-pane windows) where the heat pump struggles at the 28-32°F design temperature in Portola Valley or upper Saratoga. We model both options with actual load data so you decide on numbers, not pitch.
How big a system does my home actually need?
Smaller than your current system, almost certainly. Manual J calculations on Bay Area homes with retrofitted dual-pane windows and any attic insulation typically show 2.5-3 ton loads on homes that have 4-5 ton systems. Right-sizing improves comfort dramatically (longer cycles dehumidify properly), extends equipment life (less compressor stress), and reduces upfront cost. The "rule of thumb" 1-ton-per-500-sqft is wrong almost every time we measure.
Do you replace ductwork as part of full installation?
When the ductwork warrants it. We pre-test duct leakage with a duct blaster — Title 24 limit is 5% of nominal airflow, and original 1960s-1980s flex duct typically tests at 18-32%. If Aeroseal aerosol sealing can bring it under 8%, we use that ($1,800-$3,500 typical). If the flex liner is shedding or trunks are undersized, we replace with R-8 insulated metal trunks and R-6 flex branches sealed with mastic to UL-181 standards.
How long does the install take and is my home livable during?
Standard equipment swap with minor duct work: 2-3 days. Heat pump conversion with electrical panel upgrade: 3-5 days. Full duct replacement adds 2-3 days. We typically leave temporary heat or cooling running overnight if outside temperatures warrant. Floor protection and HEPA dust containment included. Most customers stay in the home; pets are usually fine in a closed room away from the work area.
What permits and inspections are required?
Mechanical permit from your jurisdiction (Palo Alto, Mountain View, San Mateo County, etc.). Electrical permit if panel work or new disconnects are involved. Plumbing permit if gas line modifications. Title 24 compliance documentation submitted with permit. HERS rater verification on duct leakage, refrigerant charge, and fan watt draw — typically 1-2 weeks after install. Building inspector visit 1-3 weeks after install for final sign-off.
What rebates can you actually get me on a full system?
Federal IRA 25C: $2,000 for qualifying heat pump, $600 for high-efficiency furnace, $600 for AC. TECH Clean California: $1,000-$3,000 for heat pump conversion. BayREN Home+ rebate: $1,000-$5,000 for whole-home upgrades. PG&E rebate: variable. SVCE rebate (if you are in their territory): up to $1,500. PCE rebate (Peninsula Clean Energy territory): up to $3,000. Combined stack on a heat pump conversion regularly hits $5,000-$8,000 net cash.
Do I need a panel upgrade for heat pump conversion?
Often yes if your panel is 100A or older 125A. Modern variable-speed heat pumps draw 24-60A depending on tonnage, and California Energy Code requires the panel show a calculated load that includes the new equipment with appropriate margin. We do the panel load calc as part of the design phase and coordinate with our licensed electrical partner if upgrade is needed — $3,500-$6,500 typical for 200A service upgrade including new meter base.