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Lin Woon Wah
PO BOX 5176, Hacienda Hts, CA 91745, USA
Verify this license yourself at the California Contractors State License Board (CSLB).
California's climate puts real demands on heating and cooling equipment. Long summer heat waves strain air conditioners, while cold snaps in the mountains and inland valleys call for dependable furnaces. Lin Woon Wah is an HVAC contractor serving homeowners and property owners across California, and it has held California contractor license #710642 since 1995, giving it more than 31 years of experience in the trade.
Services Offered
Service Area
About Lin Woon Wah
The company handles a broad range of residential and commercial heating and cooling work. AC Services cover diagnosis, refrigerant checks, and repairs that restore cooling capacity. Heating Services and Furnace Services address ignition problems, airflow issues, and safe operation before winter arrives. Heat Pumps, a practical option in many mild California climates, are installed and serviced alongside conventional systems. Ductwork Services focus on leaks, poor airflow, and balancing supply and return, while Thermostat Services cover installation, replacement, and programming so equipment runs as intended.
Emergency HVAC calls are handled for system failures that cannot wait, and Maintenance and Tune-up visits help catch wear, dirty components, and small faults before they turn into costly breakdowns. Each visit typically starts with an inspection so the technician can explain what was found and what options are available.
Lin Woon Wah works throughout California, so local weather patterns, building types, and code requirements are part of everyday planning. Property owners comparing local HVAC pros can review the scope of services, confirm the license details, and ask direct questions before booking. For more information about this listing, visit HVAC Service Fast.
State license record
California license #710642
Active- Issued by
- Contractors State License Board (CSLB)
- Status
- Active as of Aug 4, 2026
- First issued
- Aug 1995 (31 years)
- Valid through
- Aug 31, 2027
- Business type
- Sole Owner
- County on file
- Los Angeles
What the license covers
- C-10 Electrical
- C-20 Warm-Air Heating, Ventilating and Air-Conditioning
- C-38 Refrigeration
From CSLB public license data as of Aug 4, 2026. Licenses change — confirm the current status at the California Contractors State License Board (CSLB).
Frequently Asked Questions
What services does Lin Woon Wah offer?
What areas does Lin Woon Wah serve?
How do I choose a licensed and insured HVAC contractor in California?
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Local market — Hacienda Heights
HVAC pros here
22
Have a website
5%
Cooling demand
1,737
Heating demand
849
Cooling/heating demand = annual degree days (NOAA). Electricity = state residential average (EIA).
Local context for Hacienda Heights
- Lin Woon Wah is one of 22 businesses we list for ac services in Hacienda Heights.
Buying a new AC or heat pump in California
- California is in the DOE Southwest region: new central air conditioners installed since January 1, 2023 must meet at least 14.3 SEER2 and 11.7 EER2 (13.8 SEER2 and 11.2 EER2 for systems 45,000 BTU/h and larger). Heat pumps must meet 14.3 SEER2 and 7.5 HSPF2 nationwide.
- Since 2025, new systems are built for lower-impact refrigerants such as R-454B or R-32. Ask which refrigerant a quoted system uses and for its AHRI certificate number, which confirms the matched system’s rated efficiency.
Before you hire Lin Woon Wah
Based on the records we hold for this business.
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State license on record
CSLB lists #710642 as active (record dated Aug 4, 2026). Licensed since 1995. Re-check it yourself before work starts — it is free and takes a minute. Look it up: California Contractors State License Board (CSLB)
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Ask for proof of insurance
We have no insurance details on file. Ask for a certificate of general liability and workers' compensation coverage before anyone works in your home.
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Ask who pulls the permit
Replacing an AC, furnace, heat pump or water heater usually needs a local permit and inspection. A licensed contractor normally pulls it — ask that the permit is included in the written quote.
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Ask for local references
We do not have review data for this business yet. Ask for two or three recent customers near you.
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California homeowner protection
California law caps the down payment on a home improvement contract at 10% of the contract price or $1,000, whichever is less. Never pay more up front.
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Where this information comes from
- Name, address and phone
- State license records · added Aug 4, 2026
- California license
- CSLB public license data · record date Aug 4, 2026
- Profile summary
- Written automatically from the records above
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HVAC Service Fast is an independent HVAC directory and is not affiliated with this business. Listing details are compiled from publicly available information and may be incomplete or outdated. We do not endorse or guarantee any provider — please verify licensing and insurance directly. See our Disclaimer.