3rd Generation of Heating and AC in Orange County                                                                     Proudly Serving Southern CA Since 2004                                               



Thank you for the amazing new system! The 2-stage furnace/AC with electronic air filter you recommended is awesome! So happy that we have a more comfortable, clean home, while saving energy and money!!!! Plus, it's something I can brag about to neighbors and friends ;-)

Thanks again for the top-notch service and great work!

Jake H.,  Homeowner, Yorba Linda

  5 Star Yelp Review:

Excellent service, reliability, and price. The owner, Clase Simmons, is courteous and friendly. Obviously knows what his business is about. He did exactly what was needed and handled a big problem for us in a timely fashion. I would definitely use his services again.

Matt H., Fullerton 


I have used Guaranteed Air for years and am very happy with the service.  Clase is knowledgeable and honest,  and I've recommended him multiple times to others.  We use him in both our home and office buildings. Thanks Clase!

Ken M., Business Owner, Anaheim

Clase is the most honest and reliable heating and air guy we've come across in years.  We are very pleased with our service and would highly reccomend him!

Judy S., Homewoner, Newport Beach