SAN MATEO BASED CA C-20 LICENSED · INSURED

Bay Area
Heating &
Cooling
— done right.

C-20 licensed HVAC contractor serving San Mateo, San Jose, San Francisco, and the Peninsula. Residential and light commercial service, repair, and installation.

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★★★★★
5.0 on Google
Same-day service
Free estimates on installs
Mitsubishi heat pump specialists
⚡ LIMITED OFFER
FREE Diagnostic

We waive the service-call diagnostic fee on any repair we complete the same visit. No tricks.

💸 SAVE UP TO $3,000
Heat Pump Rebates

BayREN, Peninsula Clean Energy, TECH Clean California — we handle the paperwork. Free rebate consult.

🛡️ INCLUDED EVERY INSTALL
10-Year Warranty

10-year manufacturer warranty + our labor warranty on every qualifying new system install.

C-20
CA LICENSED
HVAC Contractor
100%
OWNER-OPERATED
Adlan on every job
$2M
INSURED
Residential & Commercial Coverage
FAST
RESPONSE
Same-Day Available
— OUR SERVICES —

Full-Service Heating & Cooling

HVAC only. No plumbing. No solar sales. Licensed heating, cooling, ductwork, and ventilation work for homes and light commercial spaces.

Heat pump outdoor unit installation — Bay Area home with San Francisco skyline at sunset
FEATURED SERVICE REBATES AVAILABLE

Heat Pump
Installation

High-efficiency heat pump installation for Bay Area homes. We install ducted and ductless systems with proper load calculations, line sizing, electrical review, and clean professional workmanship. Whether you're replacing a furnace or upgrading to all-electric comfort, we provide clear options, upfront pricing, and installation done right.

GET A HEAT PUMP QUOTE →
⚡ ELECTRIFICATION READY

Going From Gas to Heat Pump?

We walk your panel, run a real load calc, and map every available rebate before you commit. No sales pitch — just numbers.

Book Heat Pump Consult →
Heat pump outdoor unit installation — AD Mechanical Services
❄️ HEAT PUMP

Heat Pump Installation

Single-zone, multi-zone, and ducted heat pump systems. We verify sizing, electrical requirements, refrigerant line routing, clearances, drainage, and commissioning so the system is installed correctly from day one.

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Furnace repair
🔥 HEATING

Furnace Repair

Ignitors, gas valves, control boards, draft inducers, airflow issues, and heat exchanger concerns. We diagnose before replacing parts.

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AC repair
❄️ COOLING

AC Repair

Capacitors, contactors, fan motors, refrigerant leaks, coils, and airflow problems. We find the cause, not just the failed part.

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System replacement
🔧 INSTALL

System Replacement

Furnaces, heat pumps, condensers, coils, and air handlers. We size the system correctly and recommend what actually fits the home.

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Ductwork and zoning
🌬️ AIRFLOW

Ductwork & Zoning

Duct replacement, zoning panels, dampers, airflow balancing, and return upgrades. A new system is wasted if the ductwork is wrong.

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Indoor air quality
🌿 AIR QUALITY

Indoor Air Quality

Media filters, fresh-air ventilation, humidity control, and filtration upgrades. We recommend practical improvements, not useless gadgets.

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Rooftop unit, commercial
🏢 COMMERCIAL

RTUs & Light Commercial

Rooftop unit service, replacement, maintenance, and troubleshooting for property managers and building owners.

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Refrigerant leak detection — electronic detector at coil and service valves
🔍 DIAGNOSTIC

Refrigerant Leak Detection

Electronic leak detection for coils, service valves, braze joints, and accessible refrigerant lines. We find the leak source before recommending repair, recharge, or replacement.

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— CURRENT OFFERS —

Save On Your Next Service

SEASONAL
$75

AC Tune-Up Special

Full pre-summer AC check: refrigerant levels, capacitor health, coil condition, airflow, drain line. Get ahead of breakdowns before the heat hits.

Book Now →
REBATES
$3K+

Heat Pump Rebates

Up to $3,000+ in available heat pump rebates depending on eligibility and program funding. BayREN, Peninsula Clean Energy, TECH Clean California, and federal tax credits. We help guide customers through the documentation.

Free Consult →
NEW CUSTOMERS
FREE

Replacement Estimates*

Free estimates on replacements and installs. Service diagnostic fee may be waived when the approved repair is completed during the same visit.

Call Now →

* Offers valid for residential service in our core service area. Commercial and after-hours rates may apply. Cannot combine with other offers. Rebate eligibility varies; final approval depends on program rules and funding. Contact us for full terms.

AD Mechanical technician servicing rooftop HVAC equipment
— AD MECHANICAL STANDARD —
Measured. Documented. Done right.
AD Mechanical technician diagnosing residential HVAC system with calibrated tools
— ABOUT AD MECHANICAL —

We Don't Sell Equipment.
We Solve Problems.

AD Mechanical Services Inc is a Bay Area HVAC contractor built around one standard: diagnose the system correctly, explain the options clearly, and complete the work the right way.

Every job is handled with measurements, documentation, written pricing, and practical recommendations — not guesswork, pressure tactics, or mystery line items.

Measurement-first diagnostics HVAC service card
Written line-item pricing HVAC estimate card
Photos before during and after HVAC work card
Labor and parts warranty HVAC installation card
— THE PROCESS —

How A Job Goes

From the first call to the final walkthrough — no mystery, no surprises, no pressure tactics.

01

You Call

Tell us what's going on. We triage on the phone — sometimes we can guide you to a fix without a visit.

02

We Diagnose

On-site measurement and inspection. Static pressure, deltas, charge, motor draws. Numbers, not guesses.

03

You Decide

Written estimate with options. We explain the trade-offs. You pick the path. No pressure, no upsell games.

04

We Deliver

Clean install, full walkthrough, documentation, warranty paperwork. We come back if it isn't right.

— BRANDS WE WORK WITH —

We Service Major HVAC Brands

We service most major HVAC systems and install trusted equipment from approved suppliers.

Mitsubishi Electric
SPECIALIST
Carrier
Trane
American Standard
Lennox
Daikin
Bryant
York
Rheem
Gree
— RECENT WORK —

Receipts,
Not Slogans.

Recent HVAC repairs, replacements, and diagnostics across the Peninsula and Bay Area — real equipment, real problems, real outcomes.

Mitsubishi ducted heat pump retrofit — outdoor unit installed at residence, indoor air handler with refrigerant piping
HEAT PUMP HILLSBOROUGH
2025 INSTALL · HILLSBOROUGH, CA

Mitsubishi SVZ-AP30NL Retrofit

Replaced the existing gas HVAC setup with a Mitsubishi ducted heat pump system. New outdoor unit, indoor air handler, refrigerant piping, drainage, electrical connections, and airflow setup completed for efficient year-round comfort.

Commercial rooftop unit diagnostics and repair
COMMERCIAL SAN MATEO
2025 REPAIR · SAN MATEO, CA

Two RTUs Back Online Fast

Property manager called with two rooftop units down at a tenant-occupied retail space. Diagnosed compressor and dual-run capacitor failures, sourced parts, and restored cooling within the weekend window.

Honeywell HZ322 zoning controller install with smart thermostats
ZONING BURLINGAME
2025 UPGRADE · BURLINGAME, CA

HZ322 Conversion, 3-Zone Home

Replaced a failed legacy zoning controller with a modern Honeywell HZ322 and three smart stats. Cleaned up wiring, rebalanced dampers, walked the homeowner through every zone's behavior before leaving.

Second-opinion AC diagnostic — refrigerant gauges and dirty coil documentation
SECOND OPINION REDWOOD CITY
2025 DIAGNOSTIC · REDWOOD CITY, CA

Second Opinion Diagnostic

Customer had been quoted major replacement work after a previous visit. We diagnosed the actual failed component, cleaned the condenser, and restored system performance — no replacement needed. Documented findings and provided written report.

— CUSTOMER REVIEWS —

What Customers Say

Real reviews from real customers across multiple platforms. Read them below, or leave your own after we complete your job.

Google Reviews
Read on Google →
Yelp logo
Yelp Reviews
Read on Yelp →
Housecall Pro logo
Verified Reviews
Google + Housecall Pro Reviews
Read Reviews →
— VERIFIED REVIEW FEED —

Recent Verified Reviews

— REBATES & INCENTIVES —

We Know The Rebate Map

California rebate programs change often. We help identify available incentives and provide documentation for eligible heat pump installations. Final approval depends on program rules, funding, equipment, utility territory, and customer eligibility — amounts are not guaranteed.

Rebate Consult →
BayREN
Home+ heat pump rebates*
TECH Clean CA
Heat pump incentives
Peninsula Clean Energy
PCE rebate programs
Federal Tax Credits
IRA 25C credit for eligible systems*

* Rebate amounts and program eligibility vary. Funding and program rules can change. Final approval depends on the program.

— SERVICE AREA —

Based In
San Mateo.
Serving The
Bay Area.

Same-day service is available in our core Peninsula area when schedule allows. We also serve San Francisco, San Jose, and surrounding Bay Area cities for repairs, replacements, heat pumps, and light commercial work.

Don't see your city? Call us — we cover a wider radius for replacements and commercial work.

01 San Mateo
02 San Francisco
03 San Jose
04 Burlingame
05 Hillsborough
06 Foster City
07 Belmont
08 San Carlos
09 Redwood City
10 Millbrae
11 Daly City
12 South SF
13 Atherton
14 Menlo Park
15 Palo Alto
16 Mountain View
17 Sunnyvale
18 Santa Clara
19 Cupertino
— MAINTENANCE PLANS —

AD Care Plans

Practical maintenance plans for homes and commercial properties. Priority scheduling, documented inspections, and meaningful repair discounts — without unrealistic promises.

RESIDENTIAL

Essentials

$199 / year
  • ✓1 seasonal maintenance visit
  • ✓Priority scheduling
  • ✓10% off approved repairs
  • ✓Filter check + replacement reminders
  • ✓Maintenance report with photos
Join Essentials →
MOST POPULAR
RESIDENTIAL

Complete

$349 / year
  • ✓2 seasonal maintenance visits (AC + furnace)
  • ✓Priority scheduling
  • ✓15% off approved repairs
  • ✓One diagnostic fee credit per year
  • ✓Replacement credit toward new system
Join Complete →
COMMERCIAL

Property

Custom
  • ✓Quarterly RTU inspections
  • ✓Multi-property maintenance scheduling
  • ✓Clear service documentation per visit
  • ✓Single point of contact
  • ✓Custom response windows by contract
Request Quote →
— FAQ —

Common Questions

Do you charge for estimates? +

Replacement and installation estimates are free. Service diagnostics have a flat fee, which may be waived when an approved repair is completed during the same visit.

Are you licensed and insured? +

Yes. AD Mechanical Services Inc is a C-20 licensed HVAC contractor. CSLB #1155755. We carry insurance for residential and light commercial HVAC work. Certificates available on request.

Should I switch from gas to a heat pump? +

It depends on your home, ductwork, electrical panel, comfort goals, and rebate eligibility. We compare heat pump, dual-fuel, and gas furnace options before recommending a system — so the recommendation fits your house, not a sales target.

Do you handle commercial work? +

Yes. We service light commercial HVAC, rooftop units, split systems, maintenance, troubleshooting, and replacements for property managers and building owners.

How fast can you come out? +

Same-day and next-day appointments are often available in our core service area, depending on schedule, location, and parts availability. Replacements and installs are typically scheduled within 1–2 weeks.

What brands do you install? +

We service most major HVAC brands and install trusted equipment from approved suppliers, including Mitsubishi, Carrier, Trane, American Standard, Lennox, Daikin, York, Gree, and others.

Do you offer financing? +

Financing options may be available for qualifying replacement projects. Ask during the estimate and we'll walk you through terms.

— READY TO BOOK? —

Something not
working right?

Tell us what's going on. Same-day visits available. Free estimates on replacements and installs.

(510) 240-9011 Request Estimate →
— GET IN TOUCH —

Tell Us
What's
Happening.

Send the basics and we'll respond the same business day. Need help right now? Just call.

HOURS
Mon–Sat · 7am – 7pm
LICENSE
CSLB #1155755 · C-20
Call Now Schedule an Appointment →
AC Repair AC Maintenance Furnace Repair Furnace Maintenance Heat Pump Installation Heat Pump Repair Heat Pump Maintenance HVAC Diagnostic Refrigerant Leak Detection Commercial HVAC Ductwork Installation System Replacement Indoor Air Quality HVAC Contractor Bay Area
Offers Our Work About Service Area Contact
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(510) 240-9011