We are centrally located in Phoenix serving the entire valley. We service all makes and models and are a certified dealer for American Standard, Rheem, and Amana. Family owned and operated with great ratings. See our website for details.

Serviced Areas

  • Phoenix, Scottsdale, Paradise Valley, Temp, Mesa, Chander, Sun City West, Surprise, Glendale, Peoria

Payment Options

  • American Express, Debit Cards, Discover, MasterCard, Personal Checks, VISA

Contact Details

  Website
  City Phoenix, AZ
  Zip Code 85023
  Address 16602 N 25th Ave
  Phone Number (602) 362-4599
  Tollfree (602) 535-8988
  Fax (602) 535-8467

Products & Services

Repair

Our fully licensed, extensively trained, and regularly updated technicians work tirelessly to earn your satisfaction. Recognizing the stressful, often disruptive, impact of cooling malfunctions, we provide prompt appointment times during regular business hours, and 24/7 Emergency Service, throughout Phoenix Metro. Our team is always on call to assist you, and there are never overtime charges. Punctual arrival, damage free work zones, and conscientious clean up are just a few of the ways that Desert Diamond Mechanical Heating & Cooling ensures a rewarding start-to-finish experience.


Installation

When it’s time to install new or upgrade outdated equipment, you want maximum value and rewards from your investment. Rely on the experts from Desert Diamond Mechanical Heating & Cooling, and we’ll make sure you take advantage of proven products, leading-edge technology, and a system custom designed to suit your exact requirements. The result of conscientious installation from Desert Diamond Mechanical Heating & Cooling is a refreshingly cool home, superior air quality, and outstanding reliability. We keep costs low and comfort ideal.


Maintenance

As a Trane Comfort Specialist, our technicians are trained, qualified, and consistently updated in the proper procedure to optimize the performance of all makes, models, and styles of air conditioners. The benefits include restored energy efficiency, healthier air quality, superior cooling capacity, lower sound levels, longer service life, minimized cost of ownership and operation, and fulfillment of warranty stipulations. And to make sure there are no drawbacks, we offer flexible appointment times, punctual arrival, swift turnaround, and no mess or damage left behind.

Jeff was very professional, described everything so I understood and very honest

Value for money
Service & support
Quality
Location
Overall ratingExcellent

  • I would recommend this business
  • Price and excellent service
  • Not one

This is only my third Summer in Phoenix and first Summer as a new homeowner. Ugh.
When my A/C stopped blowing cold air... I freaked out a little bit.
I called Desert Diamond Mechanical Heating & Air Conditioning and had a service technician at my house in less than an hour. It was on a Saturday and after 5.
Steve S. was professional, COVID-19 compliant, and even gave me a few pointers to get my system running more efficiently.
He installed an American-Made part with a 2-year warranty and the service charge was basically the same as business hours.
That makes me happy.
I highly recommend them.

Value for money
Service & support
Quality
Location
Overall ratingExcellent

  • I would recommend this business

Excellent Service from Desert Diamond and Steve. My old unit died out in the middle of Summer and Steve came out on a Sunday to help get me set up for an install of a new unit, he went the extra mile to bring out a portable unit the same day to make sure I was comfortable until the new unit was installed.

The new Trane variable speed unit is outstanding and cools my house consistently throughout the day and is completely silent. I highly recommend going for a variable speed unit, it's worth the extra money for how it keeps the home cool in every room without having the noise of the AC constantly turning on and off.

Thank you Steve and Desert Diamond for the great service!

Value for money
Service & support
Quality
Location
Overall ratingExcellent

  • I would recommend this business

Mario was very professional. Arrived on time and notified me when he was on his way. This is my first experience with Desert Diamond and I will definitely use them again in the future.

Value for money
Service & support
Quality
Location
Overall ratingExcellent

  • I would recommend this business
  • Refer to comment
  • None

Mario is professional and a very hard worker. What’s pleasure! We have had a maintenance contract with DD For three years. If we were not happy with them at any time you would know about it!

Value for money
Service & support
Quality
Location
Overall ratingExcellent

  • came on time
  • Unprofessional, incompetent, confrontational, and unethical. No sense of ownership or responsibility

Absolutely horrible and surreal experience with this contractor (DDM). Unprofessional, incompetent, confrontational, and unethical. No sense of ownership and responsibility for their work. Customer focus is totally nonexistent. In their universe, the customer is always wrong and they are always right. That about sums its up. Full details below.



I have 2 AC units, a newer Frigidaire unit on the 1st floor and older Goodman unit on the 2nd floor. I made an appointment for a tune up. Jeff showed up on May 21, and as I wasn't there, he emails me his written report. He said both units were cooling fine, but Goodman needed R22 refrigerant top up (3 lbs), for about $700. I caledl him the next morning to discuss. He never mentioned any R22 leak, looking for a leak or fixing a leak. Because of high R22 cost quoted, I wanted to take a few days to ask for alternative quotes, so I ask him if this is critical or if it can wait a week or so. He said it can wait. Great so far (not so great about his total silence about the leak repair though). Or perhaps he wanted me to continue paying for leaking R22 at a cool $180 per pound? 



I sent out a few requests for a quote, all were lower than DDM and ALL asked if the source of leak was found and repaired. I called Jeff again and left a message with a question about the leak. No response.



Then my Goodman stopped working 2 days later. I called DDM and scheduled a visit on the Memorial Day. I told them explicitly that the upstairs Goodman was just serviced and now stopped working. Matt shows up, it's morning, I'm not at home, my guests ask him to wait some 20 min before going inside and in the meantime to start outside with the compressor. Matt goes outside and starts working on FRIGIDAIRE instead of Goodman, even though the former is cooling just fine. In fact, he ignored Goodman completely. He then goes inside and informs my guests that his work is done, that he found some "faults" with the Frigidaire, it'll take a "few days" to fix and he'll be in touch. And then he leaves. I call him a few min. later, and he tells me about "broken Frigidaire" that (as he was trying to convince me) was for the 2nd floor. I tell him he was wrong and the 2nd floor unit was broken Goodman, that Frigidaire was fine and that I explicitly told him to work on Goodman, and that he completely ignored my instructions. He became very argumentative and confrontational, and instead of addressing my concerns he demanded I pay him immediately for his visit. I told him I want to speak to his manager.



Then I called another contractor who showed up in an hour later and promptly fixed broken Goodman. They had to pump in 6.5 lbs of refrigerant which they said was the main problem why Goodman was not cooling. Better still, they found the leak and fixed it. They said the leak should have been QUITE OBVIOUS to anyone doing the tune-up earlier, as it was due to a missing $3 o-ring in the refrigerant cap, and damaged Schrader core. This immediately started alarm bells in my mind as to the quality of work that Jeff (the maintenance guy) did just a few days ago. I also asked the new contractor to run a diagnostic on Frigidaire in the light of two conflicting accounts I got from Jeff and Matt. They did, and found nothing wrong with Frigidaire.



In the meantime, I got an angry anonymous email from someone at DDM demanding the payment for the "excellent work" done by Matt and threatening to put me on "no-service list." No attempt to find out what happened, to get my side of the story, to get it resolved, nothing of the sort.  Not even "sorry" once. Just pay at once or else. It later transpired that it was the Owner himself, named Carlos. What an attitude! In my long life, I've rarely seen worse. I responded giving my side of the story, but to no avail. Matt then calls saying he checked with Jeff and although I was right about which unit was for which floor, he thinks it was not his fault that he got confused because when he was there the Goodman was working and Frigidaire was not (nonsense!), and as he wasn't given access inside (more nonsense!), this got him even more confused. Perhaps Matt needs to find a somewhat less confusing profession.I told him I have someone else to clear his mess and finish the work. 



There were few more email exchanges with Carlos in which he kept repeating "not our fault" excuses, not a single "sorry", but finally he announced that he'll waive the Matt's service fee. Lucky me! I told him I want my money back on the garbage "tune-up" work done by Jeff on Goodman and a refund on Frigidaire tune up as I had 2 conflicting diagnostics from DDM and had to pay for a third one. I also pointed out that I was charged $79 per unit for tune up while DDM website is running $59 "special". All completely ignored, just repeating his old excuses and boasting how great they are and how everyone loves them.



What a disaster. I wouldn't touch DDM with a sterilized 15' pole, even if they pay me. Stay away.

Value for moneymoney totally wasted
Service & supportnone whatsoever
Qualityextremely poor workmanship
Overall ratingPoor

  • I would recommend this business

Jeff, our tech, came earlier than the window the dispatcher had given me, which was wonderful! I loved that he was wearing a medical-grade face mask when he arrived, as we have not been around anyone other than family during this Pandemic. Jeff was kind, professional, thorough, explained everything to me so that I easily understood the problem. Not only did he dissect the issue, he had the solution (a new motor for our AC unit) in his truck, so he was able to stay and put in the new motor. With temps over 100 degrees, this was HUGE to be able to know that we'd have our AC up and running by the time he left. He was honest and trustworthy, a great guy! We'd never used this company before, and from the first phone call with the sweet and helpful woman that answered the phone to Jeff's prompt and courteous professionalism, it was a very positive experience! I will recommend you to friends!

Value for money
Service & support
Quality
Location
Overall ratingExcellent

  • I would recommend this business

Desert Diamond is the BEST! They just completed installing our new heating and air conditioning system along with adding more insulation into the attic. What a Great experience! Very professional and on time.
J.C. and Riley did a quick job removing our very old unit and installed our Brand New Trane. This is probably the quietest heating and air conditioning system we've ever had with the many homes we've owned over the years. The insulation team also did an amazing job filling those areas that needed more blown in insulation that the original builder failed to add. All together this was Terrific. Call Desert Diamond.

Value for money
Service & support
Quality
Location
Overall ratingExcellent

  • I would recommend this business
  • They were there. Thank you, thank you.
  • None

Was in Texas for months. Came home to a cold house and a bad cold. Called and they came within hours. thank you, thank you.

Value for money
Service & support
Quality
Location
Overall ratingExcellent

  • I would not recommend this business
  • on time
  • High cost , bad service, lack of responsibility

This company like a fool. When I agree and sign the contract. They said no interest for my load to get over $8,000 new AC systems. We will pay $140 something for monthly. The installation for new AC is bad because they did not complete the coil from unit and leave them for 2 week. Moreover, I break my garage light at garage when they bring AC unit to the roof. They also destroyed a wood from the roof as well. They came back after a month and completed the coil after complaint. But they did not fix the wood on the roof and light. After a month, I got a bill from bank and they said we have to pay over $140 + $60 something for interest. So that mean we have to pay over $200 each month. When I call them, they said they are no responsible for this. What? They are no responsible and tell us to contact to Bank.
I will update what are going on!

Value for moneyHigh cost for new ac.
Service & supportBad service on phone call
QualityLack of professional when install new ac.
Location
Overall ratingAverage

  • I would recommend this business

Air conditioner seasonal check. He was on time and explained everything.

Value for money
Service & support
Quality
Location
Overall ratingExcellent

  • I would recommend this business

Had a great experience from the start to finish with this company. I thought I had a Trane, so after getting on their website this is the company they referred me for the Phoenix area. It's a no wonder they have a high rating! Customer service was great and same day service. But RYAN our technician was so honest and knowledgeable, and fixed our problem . Last summer we had to go through Air Standards sent out from the home warranty company and had 5 different calls out. I can't even begin to tell you the night and day difference from these two companies. I am so glad we found this company and look forward to using them for all our a/c services!

Value for money
Service & support
Quality
Location
Overall ratingExcellent

  • I would recommend this business

My husband and I are so pleased with everyone at Desert Diamond. Justin came to do our yearly inspection and noted that there was a leak and the air conditioning unit was 20 years old. He presented the facts and no pressure for us to decide at that moment about a new unit. He was so polite and respectful. We appreciated that so much. We called and spoke to Melanie in the office and she was helpful getting us set up with financing and making sure we understood everything involved with the purchase of a new unit. She was so nice! JC & Alex were our installers and they were so amazing! Everything was concise and everything we needed to know regarding the new unit was explained perfectly. They both were also so respectful, kind and polite. Everything was spotless when the job was complete! We are so grateful!!!

Value for money
Service & support
Quality
Location
Overall ratingExcellent

  • I would recommend this business
  • Very knowledgeable
  • None

Our technician Steve Schilling is very professional and very knowledgeable showed us everything he was doing to our heating AC unit with pictures no sales pitch just good down to earth business. I would recommend Desert Diamond mechanical
And Steve Schilling.
Will use Desert Diamond Mechanical for all our AC and Heating.
Dan Blair

Value for money
Service & support
Quality
Location
Overall ratingExcellent

  • I would recommend this business

Steve Schilling is so courteous and nice. He has given on great service and support.

Value for money
Service & supportGreat service and support
Quality
Location
Overall ratingExcellent

  • I would recommend this business
  • right on time and very social

Steve Schilling represented his company in very professional way.
He did very superb service job in my house. He answered all my questions and advised me on very valuable things do to prolong the life of my AC.
He is a very valuable asset to Desert Diamond Air Company.
Thank Steve for servicing my unit.
Frank Insolia , Scottsdale AZ.

Value for money
Service & support
Quality
Overall ratingExcellent

  • I would recommend this business

Woke up at 6 on a Sunday morning, house was 61 degrees inside and vents were blowing cold, called DDM around 6:30 and got an actual nice human being. Jeff, the technician was here by 9 as promised and 10:30 all fixed. Did you notice I said Sunday morning? Wow, how would I not appreciate this business? I'm warm.

Value for money
Service & support
Quality
Location
Overall ratingExcellent

  • I would recommend this business

Kevin: thanks.
Ececellent service

Value for money
Service & support
Quality
Location
Overall ratingExcellent

  • I would recommend this business
  • 24-7 service

Fast, professional and efficient! Thank you Steve!

Value for money
Service & support
Quality
Location
Overall ratingExcellent

  • I would recommend this business

I cannot thank Cody and Desert Diamond enough. Our a/c compressor died in the middle of the night on a record heat day. Cody was at my house within 20 minutes of me calling them in the middle of the night. My compressor was under warranty so we had to wait until morning to get the new one. Cody came that day and had cold air blowing very quickly. I am a customer for life now. Service like what we experienced with them is unheard of these days. Extremely courteous, trustworthy and professional. The price was very fair as well. Thank you again Cody!

Value for money
Service & support
Quality
Location
Overall ratingExcellent

  • I would recommend this business

Anthony was just here to do our twice a year checkup that we signed up for on contract after using their Emergency Service last year, which they fixed our unit that went out in the summer. They were fast and good then also. He was extremely friendly, very knowledgeable and checked out everything in our system. This company has earned and deserved our trust. Would love to have Anthony back next time we need any service. Thank You guys Very Much !!

Value for moneyNot taken advantage of.
Service & supportOn time & thorough.
QualityExcellent previous work done
LocationNearby
Overall ratingExcellent

  • I would recommend this business
  • Value, Professionalism, Quality installation, Follow up... all great.
  • Cannot report any.

Home Owners,
Desert Diamond Mechanical by far was head and shoulders above the rest out of the estimates that i got. Complete professionals with real solutions to my systems problems.
Here is my rating:
1. Communication and timeliness
5 stars
2. Assessment of problems and options for solutions.
5 Stars
3. Scheduling and installation of new Train heat pump.
5 stars
4. Diagnosis of duct efficiency repair and Aeroseal installation.
5stars.
5. Total cost - low competitive. However installation and duct repair was above and beyond what could have been expected for the total cost.
Great Value!
5 stars.
Furthermore they work with APS and were able to provide the rebates available from APS up front reducing immediate out of pocket costs.
Desert Diamond Mechanical is the whole package under one roof with a great crew of guys.
Thank you Steve, Ben and Jay.
Results. First full month of use we received a "congratulations" from APS on our bill because we had a 25% reduction in energy use and in the amount of our bill.
Quality service, Quality installation.
Very impressed.

Value for moneyBest from all my quotes
Service & supportAlways address every issue proffessionally
Quality10 year Train Unit, Perfect installation
LocationServices entire valley
Overall ratingExcellent

  • I would recommend this business

I cannot say enough about the service from this company. With the outside temperature of over 110 degrees, Corey was at my home within an hour. The temporary fix worked for a while and no charge for the second visit. Making the decision to install a new unit, again a temporary fix made me comfortable till the unit was installed. Every one of the employees were very accommodating and I was impressed as how quickly the job was done. I strongly believe that you could not get better service!

Value for money
Service & support
Quality
Overall ratingExcellent

Customer Testimonials

Desert Diamond Mechanical is the best heating and A/C Company I have ever dealt with. Calls into the office are always answered right away by a smiling voice and returned calls happen very quickly. I was so impressed with their level of service that I purchased a service contract with them that gives me service with any breakdown within 24 hours. This summer my A/C unit went out, and in the past when the other guys were telling me that I would have to wait days without A/C for someone to come out to inspect my unit because it was summer and they were busy, Desert Diamond Mechanical was at my home within 2 hours and had my system up and running. They even took care of dealing with the warranty on my A/C unit for me and the repair cost me nothing. I have tried other service companies, but these guys give real meaning to the words service and customer service. I am also a Realtor in Phoenix AZ and I use this company for my own personal residence as well as refer them al all of my real estate clients.


I was having problems with my ac a few days ago. The weather had just gotten too hot and my air wasn't working. I called Desert Diamond and they got a tech out to my house the next day. They checked every thing out and got me up and running the same day. They are fast and reliable. The tech was nice and the cost was much lower than some other companies that are out there. Right now on my budget every dollar counts. My air is running and I'm a happy customer. I would recommend them to anyone who needs service, especially if they need it quickly.


Desert Diamond Mechanical Heating & Air Conditioning is a fantastic, trustworthy company. We were very pleased with the service we received when we had two heat pumps replaced. Cody manner makes you feel at ease. He is very knowledgeable, professional, and informative about the heat pumps they offer. The entire service crew, led by Ben, was terrific. They brought everything they needed to keep our house as dust-free as possible and make the installation pain-free. We observed how they worked cohesively and efficiently as a unit. From the top to the bottom, the owner and staff were eager to help, friendly and the most customer service oriented people we have ever dealt with. The follow up visits have been nothing short of top notch. We would definitely recommend Desert Diamond Mechanical Heating & Air Conditioning to our friends and family.


Desert Diamond Mechanical are by far the best Heating and Cooling company I have come across. There professionalism stands out above the rest. Special thanks to Steve whose advice and follow up was second to none, his and Jason's full evaluation of my air conditioning was enlightening and while I did not go with all there recommendations they execution and follow up was faultless. Their air improvements as well as the new air conditioner has saved me on average $125 a month. Fully recommend them.


I rarely write reviews, but Desert Diamond definitely earned 5 stars. When my AC unit went out late at night and we needed emergency service they were there with courtesy, promptness, and professionalism. Our air was back on within an hour and we avoided having to stay in a hotel. Special thanks to Cody, our technician, who despite the late time was pleasant, professional, and courteous. Definitely earned my repeat business! A++


I didn't realize my air stopped working until after 9 pm. I got a prompt response to my call rather than hold music, and they gave me a window for tonight instead of making me wait until the morning. Anthony provided exceptional customer service despite the late hour, during what I imagine is a busy AZ summer season where ACs are breaking all over the place. I'm very happy with the service provided, and I'd highly recommend their team for anyone looking for prompt, reliable AC maintenance and/or repair.

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