Flex Air Duct Cleaning
HVAC contractor in San Francisco, California 94109
- Rating
- 5.0 / 5.0 from 1 reviews
- Address
- 3167 Polk St, San Francisco, CA 94109
- Open
- 7 days a week
- Service area
- San Francisco
- Phone
- (628) 216-3012
About
Flex Air Duct Cleaning serves San Francisco and operates 24 hours every day. The business holds a 5.0-star rating from 1 Google review.
Service Area
Serving San Francisco.
Hiring an HVAC Contractor in San Francisco, California
In California, HVAC work falls under the Warm-Air Heating, Ventilating and Air-Conditioning Contractor license class (C-20). Before you hire any contractor for heating, cooling, or air quality work, ask to see their license and verify it with the California Contractors State License Board (CSLB). You can look up any license online at no cost on the CSLB website using the contractor's name or license number.
Many HVAC projects in San Francisco require a building permit from the city. The California Building Standards Code requires a permit before any work on a building or structure is done. Because code requirements vary by city and county, contact the San Francisco Department of Building Inspection to find out whether your specific job needs a permit. Your contractor should be able to advise you on this.
When you call to get a quote, ask the contractor about their C-20 license status and request references. Make sure any contract you sign includes the scope of work, timeline, and payment terms. The CSLB recommends checking a contractor's complaint history on its license-lookup tool before you hire.
What type of license does an HVAC contractor need in California?
HVAC work in California requires a Warm-Air Heating, Ventilating and Air-Conditioning Contractor license, classified as C-20 by the Contractors State License Board. [1]
How do I check if a contractor's license is valid?
You can verify a contractor's license for free on the California CSLB website by entering their license number or business name. The lookup tool will also show any complaints filed against them. [4]
Do I need a permit for HVAC work in San Francisco?
Yes, according to California Building Standards Code, most building work requires a permit from your local building department. Contact the San Francisco Department of Building Inspection to confirm what your project needs. [3]
What should I ask a contractor before hiring?
Ask for their C-20 license number and verify it through CSLB. Request references, and make sure any contract spells out the work scope, timeline, and payment terms. [2, 4]
Why should I check complaint history?
The CSLB license-lookup tool displays complaint disclosures. Reviewing this history before you sign helps you make an informed choice. [2, 4]
Sources
- California CSLB — licensing classifications (read 2026-09-20)
- California CSLB — hire a licensed contractor (read 2026-09-20)
- California CSLB — do I need a building permit? (read 2026-09-20)
- California CSLB — check a license (read 2026-09-20)
Contact Information
Business Hours
| Monday | 12 AM – 11:59 PM |
|---|---|
| Tuesday | 12 AM – 11:59 PM |
| Wednesday | 12 AM – 11:59 PM |
| Thursday | 12 AM – 11:59 PM |
| Friday | 12 AM – 11:59 PM |
| Saturday | 12 AM – 11:59 PM |
| Sunday | 12 AM – 11:59 PM |