HVAC reviews in Anaheim, California

My AC went down over Labor Day weekend and they were the only ones to call me back. Clase was awesome and had my AC back up in less then 30 minutes.

He was referred to me by my aunt and I HIGHLY recommend them!

10/10 hands down best company.

Clase is such a great guy. We have been using Guaranteed Air for many years and they always exceed my expectations.

Highly recommend.

Clase came out within the time slot as promised & was able to pinpoit the issue with our furnace in a short time. The part that needed replacement was picked up Eric and within 2 days our furnace was up & running. Very personable & proficient company. Would recommend them anytime.

Clase was wonderful. He identified the issue and fixed the problem right away. This is the second time he fixed by AC unit so I don’t have to replace it for a new one. I will definitely use his service again if I ever have an issue with my AC.

We will be lifelong Guaranteed Air customers. Clase and his team are so professional, honest, and do the best work! 7 years ago a company tried to take advantage of us and said our A/C was shot. Clase came out and fixed all the issues and our A/C is still going strong! A year later, one of our ducts was torn and they came out and fixed it the same day. Then we purchased a nest and Clase came out and installed it free of charge! We now only use Guaranteed Air for any of our A/C needs and the essential twice a year maintenance. I can’t say enough about this company! We will continue to use their services until we need a new unit and he will be our guy, hands down.
We recently referred him to our neighbor and they were so impressed and comfortable with Clase from the start. They had two other companies come out and the estimates and customer service did not even come close!
They are scheduled to have a new, furnace, A/C and ducting with Guaranteed Air, next week! Plus Clase suggested moving their unit in the attic and that’s what they are doing. This is such an awesome company! Call them, you won’t regret it!

I have used and referred Guaranteed Air several times. Clase has always been very professional, responsive, and honest. He has helped with big and small items and is very fair with his pricing. I would highly recommend anyone to use them.

As always, Clase and his team made everything easy! They arrive promptly everyday and completed the new HVAC install in no time! Very highly recommend you use Guaranteed Air for all you HVAC needs!

Clase was able to schedule a visit on a holiday weekend. He was able to quickly assess the problem, order and pick up the necessary part, and repair our AC unit so that it’s running like normal again. Very professional, courteous and highly recommended!

We love Guaranteed Air for our AC and Heater!! Everyone in the office is great and Clase, who services his customers is the best!! Thanks Guaranteed Air!!! Connie Willson :)

Clase is the owner of Guaranteed Air and I have the highest respect for the work he and staff provide. Recently Eric arrived and worked on our Air Conditioning system, he's an excellent technician and did a trouble shoot on the system. He left with my A/C working correctly, I appreciate the professional assistance and friendly attitude.

Eric and ;Matt did a very vice job insulating our furnace and stopping all the whining noise,

Guaranteed Air is very professional, on time and did an excellent job installing our new Central AC & heat,
We have continued to use them for our yearly maintenance as well!
We like them so much we have recommended them to my Sister and Friends.
I highly recommend Clase & his workers.
Exceptional quality, fair prices and excellent service.

Clase & his team is exceptional in their work, professionalism, price very reasonable .Will recommend them to everyone in need.

5 STARS!!
I am writing to express my sincere appreciation for the outstanding HVAC service I recently received from your service team member Eric. From the moment I contacted your office to the completion of the job, the experience was nothing short of exceptional.
Your technician, Eric, was punctual, professional, and extremely knowledgeable. He took the time to explain the issue clearly and offered a practical solution. His attention to detail and dedication to quality work was evident throughout the entire service call. He's a great ambassador to the Guaranteed Air name, team, and owner.
Thanks to your technician's expertise, my HVAC system is now running more efficiently than ever. It’s rare to find a company that combines technical skill with such excellent customer service, and I felt it was important to recognize that.
Please extend my gratitude to everyone involved including Office Manager Patty and Owner Clase. I will certainly continue to recommend your services to family, friends, and colleagues in need of reliable HVAC support. In this day and age Public Trust is paramount and Guaranteed Air is a leader in trust with their clientele.

Warm regards,
A.O.

We’ve been using Guaranteed Air for over 10 yrs. Clase is our go-to trusted HVAC person! He’s honest, diagnoses the problem correctly, does good work, and doesn’t overcharge. I highly recommend without any reservations!

Annual service done by Eric and he was awesome. We have also had entire system replaced by Guarantee in past. All work they have done has been great! Eric did a thorough job on servicing and cleaned up after himself when he was done, HIGHLY recommend.

ask these two guys to move up so I can get out, ( of my parking spot ) Come back I’m gonna park in the same spot and they just look at me Even though I have more than enough room to pull up a tiny bit.. to make it easy ! This is the type of guy you got working for you?

Clase has always been dependable and has fair prices. He has great communication and follow up. Would highly recommend him for your HVAC services!

Had a leaky shower. Called and made an appointment. The technician was prompt and gave me very reasonable estimate. Job was completed and the technician did an excellent job. Very personable. Definitely will call again. Thank you.

Kalia was amazing! She was patient, understanding, and took the time to really listen and help me with my situation. It’s rare to find someone so kind and professional. I truly appreciate her excellent customer service!

Whitney with Marathon was excellent for getting my heating back up in running. And can't say enough about the office staff in getting quick response that I needed. I would not hesitate to recommend Marathon.