

Proudly Serving Orange County, Riverside County, & Los Angeles County Since 1987
About Us
Proudly Serving Orange County, Riverside County, & Los Angeles County
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. We have been in business for over 30 years and are proud to have earned a stellar reputation among our customers over the years – so much so that our business has grown and thrived by word of mouth from satisfied customers. We work with homeowners, contractors, businesses, and HOAs to provide state-of-the-art products and workmanship with “20th Century Service” based on reliability, honesty, professionalism, and fairness.
Call (714) 430-8006 today to learn how we can meet your heating and air conditioning needs. We look forward to serving you!

Let’s Get to Work
How Can We Help You Today?
Discover the 20th Century Difference
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FAQ's Have Questions? We Have Answers!
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Get to Know UsLearn about our company history and who we are.
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Club Maintenance Membership Signup/Resign
The Club maintenance membership includes 2 visits per year:
One visit includes the maintenance of the air conditioning system.
The other visit would include the maintenance of the heating system.
As a club member, you would be on our priority scheduling list if any issues arise.
As a club member, you would have exclusive discounts which would include:
- 10% repair discount
- 5% system replacement discount
- 5% IAQ (Indoor Air Quality) discount

Trusted For A Reason
Our Customers Say It Best!
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“Juan was punctual and very honest with his work. I really appreciate him bringing his own shoe covers for walking around the house. The pricing was fair.”- Sweet L.
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“Although they originally no-showed, they did good business by rescheduling immediately and providing an additional discount. I think that generally made up for it and deserves 5 stars.”- Albert C.
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“Juan was punctual and very honest with his work. I really appreciate him bringing his own shoe covers for walking around the house. The pricing was fair.”- Sweet L.
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“These guys are on top of their specialties. We been their clients for almost 3 years now. Honest dependable and flexible. That goes pretty much on prices as well as availability.”- Eric O.
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“My mother in laws AC unit went out at her manufactured home. It was during this heat wave and she was concerned it would take week or two to get it fixed. 20th century air was phenomenal as always. They came out and fixed it the next day.”- Jen R.