- License number
- 511598
- Licensed for
- Heating, Ventilation & Air-Conditioning
- First issued
- 1987
- Valid through
- Jun 2027
- Bond
- Bonded $25,000
- Workers' compensation
- Workers' comp insured · through Nov 2026
- Source checked
- Jul 28, 2026
Public evidence profile · Checked May 2026
20th Century Air Inc.
Credentials & registries
California Contractors State License Board
No Trust Score yet
- Rated 4.0 from 16 reviews
- 1 credential shown
Based on rating, review volume, independent sources and credential evidence. Evidence context, not a guarantee of workmanship.
Credentials and associations
1Credentials and memberships
These credentials and memberships are attributed to named public sources. Check the source before relying on them.
Reviews · public evidence
What customers say
These review totals are published independently on the named public source below, not testimonials this business chose to show. We show the aggregate rating, review volume, and source attribution we hold so you can weigh the evidence yourself.
4.0out of 5
Where these reviews are published
- Porch16 reviews · 4.0 avg
Sources
2 named public sourcesWhere this information comes from
Everything on this page is drawn from named public sources. Where a source provides a public link, you can open the original and dig deeper.
Review sources
Registers and membership directories
Public evidence last checked May 2026
About
20th Century Air, Inc. - Heating and Air Conditioning in Orange County "21st Century Products with 20th Century Service" We are a family owned and operated company specializing in heating and air conditioning installation, replacements, maintenance, and repair in Orange, LA, and Riverside Counties... Read more about 20th Century Air Inc.
Your own checks
What to check before you hire
Worth checking yourself
Always confirm credentials and quotes with the business directly before hiring.
Contractor licensing in the US is set by each state (and sometimes the city or county). For electrical, plumbing, HVAC or any major build, confirm the trade is licensed on your state's licensing board before hiring. Unlicensed work where a license is required can void permits and insurance and leave you no recourse.
Ask for a lien waiver as you pay each stage: in most US states an unpaid contractor or subcontractor can place a mechanic's lien on your home even if you already paid the main contractor, and a signed waiver is your protection.
Confirm they cover your area and can actually come out in your timeframe before anything else.
Want an extra legitimacy check? Run the Rogue Contractor Check on 20th Century Air Inc. before you contact them.
Run Rogue Contractor Check →Good to know
Common questions about 20th Century Air Inc.
Is 20th Century Air Inc. a legitimate business?
20th Century Air Inc. has 16 independent public reviews, rated 4 out of 5. This is independent public evidence gathered from named public sources (no ads, no paid placement), not a guarantee of workmanship. If anything here is out of date, the business can request a correction.
What do customers say about 20th Century Air Inc.?
20th Century Air Inc. has 16 public reviews, averaging 4 out of 5. The reviews section shows the aggregate rating, review volume, and review source information we hold.
How do I know 20th Century Air Inc.'s reviews are genuine?
20th Century Air Inc.'s 16 public reviews come from a named public review source. MyTrustedTraders brings this public evidence together with no ads and no paid placement: we show the review source information and aggregate rating we hold rather than selling rankings, so you can weigh the evidence for yourself.
Is 20th Century Air Inc. qualified and accredited?
We hold 1 independently sourced credential for 20th Century Air Inc., including California Contractors State License Board. Each is attributed to the body that issued it in the credentials section. For example, California Contractors State License Board is California's Contractors State License Board: the state body you must be licensed with to do contracting work in California.
