Top 7 HVAC companies in San Mateo, California

San Mateo County lists seven firms with five-star ratings in public directories. Review counts stay low, from one to three per company. The Bayesian adjustment pulls every raw score toward the national mean of 4.764. Installed costs sit well above national figures. Licensing is statewide through the CSLB while permits remain local. Federal tax credits for residential HVAC ended after 2025.

How to choose

Check every C-20 license on the CSLB site before any deposit. Compare review volume against the adjusted score shown in the ranking. Confirm whether the firm carries its own HERS rater or passes that cost to the homeowner. Ask for the exact permit fee quoted by the local building department. Verify 24/7 claims against actual service records. Request the lesser-of-$1,000-or-10% deposit cap in writing.

The shortlist

Express home services

Express home services operates from 301 N Amphlett Blvd, San Mateo, CA 94401 and lists as a plumber with published 24/7 service. Its phone number is (650) 343-9477. Two reviews produced a raw rating of 5.0. The adjusted score used for ranking is 4.839, pulled down 0.075 from the raw figure because the review count remains small relative to the national mean of 4.764. The score before tie-breakers was 4.779. A public website and 24/7 listing supplied the final tie-breakers. These numbers do not reveal whether the firm performed the two rated jobs as a heating contractor or as a plumber.

San Mateo Air Duct Cleaning Svc

San Mateo Air Duct Cleaning Svc lists its address as 753 N Amphlett Blvd, San Mateo, CA 94401 and its category as Services. The phone number is (650) 753-2490. Two reviews again produced a raw 5.0. The adjusted ranking score stands at 4.839 after a 0.075 downward pull toward 4.764. The pre-tie-breaker score was 4.779. A public website and 24/7 availability supplied the tie-breakers. The figures give no information on whether duct cleaning or full HVAC replacement formed the basis of the two reviews.

AirFlow HVAC Solutions

AirFlow HVAC Solutions is located at 1015 Howard Ave, San Mateo, CA 94401 under the Services category. Its phone number is (650) 503-0326. One review yielded a raw 5.0. The adjusted score used for ranking is 4.832, lowered 0.068 from the raw rating because a single review carries limited weight against the national mean of 4.764. The score before tie-breakers was 4.772. Public website and 24/7 availability provided the tie-breakers. The single review supplies no detail on system size or complexity.

Bayside Heating & Air Conditioning, Inc.

Bayside Heating & Air Conditioning, Inc. operates from 720 S Amphlett Blvd, San Mateo, CA 94402 and lists as a general contractor. The phone number is (650) 299-9070. Three reviews produced a raw 5.0. The adjusted score is 4.825 after a 0.061 downward adjustment toward 4.764. The score before tie-breakers was 4.785. A public website supplied the only tie-breaker. The three reviews do not indicate whether the work occurred under C-20 classification or general contracting.

Powerline Cooling & Heating SMs

Powerline Cooling & Heating SMs lists its address as 2660 S El Camino Real #3, San Mateo, CA 94403 and its category as general contractor. The phone number is (650) 456-9666. Three reviews again produced a raw 5.0. The adjusted ranking score is 4.825, pulled down 0.061 from the raw figure. The score before tie-breakers was 4.785. A public website supplied the tie-breaker. The review count does not disclose whether the jobs involved full system replacement or smaller repairs.

Advanced H.V.A.C. Systems, Inc

Advanced H.V.A.C. Systems, Inc operates from 1504 5th Ave, Belmont, CA 94002 and lists as a general contractor. The phone number is (650) 334-0277. Two reviews produced a raw 5.0. The adjusted score used for ranking is 4.799 after a 0.035 downward pull toward 4.764. The score before tie-breakers was 4.779. Published 24/7 availability supplied the tie-breaker. The figures give no indication whether the two reviews covered coastal or inland addresses.

Carney Refrigeration inc.

Carney Refrigeration inc. is located at 1031 N Amphlett Blvd, San Mateo, CA 94401 under the general contractor category. The phone number is (650) 697-8762. One review produced a raw 5.0. The adjusted score used for ranking is 4.772, only 0.008 above the national mean of 4.764. The score before tie-breakers was also 4.772. No additional signals were recorded. A single review cannot reveal whether the firm handled refrigeration or full HVAC installations.

Cost

Two data sources report different installed costs for San Mateo. The typical full-system figure stands at $12,550, with a published range of $11,200 to $13,900. Invoiced 2025 averages reached $23,465 and the upper quartile hit $33,723. Labor is listed at $165 per hour. Permit fees range from $250 to $700. The gap between the two sources is information, not error; one reflects quoted typical jobs while the other reflects actual billed amounts that year. Both place San Mateo in the high-cost tier versus national figures. Homeowners should request line-item quotes that separate equipment, labor, and the local permit fee.

Licensing and permits

California HVAC work requires a C-20 Warm-Air Heating, Ventilating and Air-Conditioning license issued by the Contractors State License Board. The board maintains an online lookup at the address supplied in the data. A $25,000 contractor bond is mandatory under Business and Professions Code section 7071.6. Workers compensation insurance is required whenever employees are present; no exemption filing is permitted for C-20 or C-38 classifications. Licensing itself is statewide. Building permits for residential changeouts are issued by the local city or county building department, not by the CSLB. Fees in San Mateo fall in the $250-700 range according to the supplied data. Homeowners must confirm the exact permit authority for their address.

Incentives

California Home Energy Rebates remain available in Phase 1, with heat-pump rebates up to $8,000. No statewide income-tax credit exists for HVAC equipment. Ratepayer programs through TECH Clean California, BayREN, and Golden State Rebates offer $1,000 to $3,000 or more. All listed programs require an enrolled or participating contractor. The 25C and 25D federal tax credits expired December 31, 2025. Only the commercial 48E ITC survives for systems that meet begin-construction or placed-in-service deadlines. The statutory deposit cap of the lesser of $1,000 or 10% applies. Homeowners should ask specifically which installer participates in the TECH network before signing.

Climate

San Mateo sits in Title 24 climate zones rather than IECC zones, with dominant zones 3B and 3C. Heating degree days total 2,200 and cooling degree days total 1,000, producing a balanced mixed load profile. Winter design temperature is 44 °F and summer design temperature is 89 °F. Coastal humidity stays low while inland areas are drier. Natural gas remains the primary heating fuel, yet state code favors heat pumps. Coastal portions often require no air conditioning while inland pockets are cooling-dominant. Equipment must handle mild year-round loads with occasional summer peaks. Proper sizing and Title 24 duct leakage verification matter more than oversized capacity in this market.

Public listing data alone cannot confirm workmanship or recent capacity to handle current permit backlogs.