Cornerstone Air

In Cornerstone Air's own words

Cornerstone Air is trusted residential & commercial HVAC company serving Plano & Prosper, TX, with heating and cooling solutions for homes and businesses. Our HVAC installation services include system installations, replacements, and upgrades designed for lasting comfort and efficiency. We provide professional air conditioning installation, maintenance, and ac repair services to keep your cooling system running reliably through heat. When temperatures drop, our heating repair company delivers prompt repairs, maintenance, and installation support. With honest service, experienced technicians, equipment, and responsive care, Cornerstone Air is ready to help with year-round comfort. Contact us today for reliable HVAC service and free quote!

Trade

HVAC contractor

Business address

2821 W Parker Rd #3a, Plano, TX 75023

Telephone

(214) 919-4981

Website

cornerstone-air.com

Hours

• MondayOpen 24 Hours
• TuesdayOpen 24 Hours
• WednesdayOpen 24 Hours
• ThursdayOpen 24 Hours
• FridayOpen 24 Hours
• SaturdayOpen 24 Hours
• SundayOpen 24 Hours

From the business's Google listing, checked Oct 2026

Register

TX register

Recorded as supplied and as found in public sources. This register makes no credential or quality claim about any business; check license status with the state board.

Google Reviews

5.0 ★★★★★ (83)

• The Technician was amazing, he got the issue fixed in a timely fashion. I will definitely do business e\with Cornerstone Air in the future

  Edward H.★★★★★

• Clayton is prompt, courteous, thorough and takes his time to explain everything and answer questions. Customer service and quality of work is phenomenal. Keep up the great work!

  Syed A.★★★★★

• Excellent experience

  Gerald K.★★★★★

• Very professional and high integrity.

  Safe C.★★★★★

• Everything was quick and professional. He explained everything clearly and was very helpful. Response time from our call to having our AC working again was only a couple of hours

  Shannon V.★★★★★

• Fantastic service!! Our A/C went out in the middle of a heat wave...heat index over 100F! We called Cornerstone Air and requested an emergency call from their answering service. Clayton called us back within minutes and arrived at the house less than two hours later. He assessed the system, found the fault, and fixed it in about 15 minutes. A great experience from start to finish without having to fight our way through AI bots like with other companies. HIGHLY RECOMMEND!!

  Dave W.★★★★★

• Clayton at Cornerstone did a wonderful job for the second time now getting my air conditioning up and running again. He was upfront about the cost of the repair and my options.. I give this company my highest recommendation. I would suggest you give them a try.

  Steven K.★★★★★

• Always nice and honest.

  Brian W.★★★★★

• We had an evaporator coil replaced. I found them trustworthy, friendly and responsive, even with the outside temperature hitting 106. Glad I found Clayton and Dak. Repair went smoothly and HVAC has never run better.

  David N.★★★★★

• Our AC stopped working Saturday at 6pm in late July 100+ temps. Cornerstone Air was the only AC company where we got to speak to an actual human. All the other AC companies forced us to talk to an AI, or fill out a form online....NO thanks. Clayton answered our call Saturday night and was out to our house and fixed the problem by 10:15am Sunday the next day. Clayton at Cornerstone Air is now our go-to ac/heating company.

  Kelly C.★★★★★

• Cornerstone will always respond promptly, even on the weekends. They are thorough and will always take care of everything needed. You couldn't ask for better service.

  Effie C.★★★★★

• Worked with Dak today. Serviced 4 units. Did troubleshooting on a 5 ton unit. Instead of replacement, found a problem that will be pretty easy to fix and not very expensive. Will correct the issue instead of buying a new unit. Not everyone is as thoughtful as Cornerstone and Dak. Much appreciated! They’re honest and get the job done. That’s why I use them. Would recommend that you should consider doing the same. Ron Yates

  Ron Y.★★★★★

• Dak was great, showed up on time and provided thorough diagnostic.

  Jason E.★★★★★

• Best price I found. Quick response. Very knowledgeable and respectful. Got the job done.

  DifinityRelin★★★★★

• Excellent service and patience. Arrived within 12 hours of me contacting them the night before. A+

  Anthony S.★★★★★

• Responsive. Informative. Did not upsell which I appreciate. He went above and beyond. Highly recommend

  Shari F.★★★★★

• Had a very good experience. It was a small problem, but they easily diagnosed what another person missed and didn’t try to upsell me into a new anything like the others

  R H.★★★★★

• I called Cornerstone Air on a Sunday evening when my A/C unit went down and Dak was quick to respond with a callback. We discussed the issue and he scheduled a technician for 8am the following morning. Clayton was onsite by 8am and quickly diagnosed the problem and headed to the parts house. Upon his return and installation of the new fan motor he also found the motor start capacitor was the wrong size. This capacitor was previously installed by another company and was oversized, which certainly could have contributed to the motor failure. Clayton was very professional, knowledgeable, courteous, and worked quickly to get our unit back up and running to keep us comfortably cool. Don't hesitate to give Cornerstone Air a call when you need a quality HVAC service. Thanks again to Dak and Clayton for exemplary service!

  B C.★★★★★

• As a widow who’s never had to manage home maintenance, I was concerned about being taken advantage of. So when my HVAC system leaked a good amount of liquid thru the ceiling duct onto my hallway floor, I knew I had to find someone. After Cornerstone was recommended, I reached out to Mr Terry with my concerns, and he promptly replied setting up an appointment. I had no need to worry because Mr Terry was fabulous. He listened to my concerns, checked out my system, and explained everything. He changed the disgusting filter (my fault) and set me up with a yearly maintenance plan which was frankly much less expensive than I was expecting. I am throughly satisfied and would highly recommend this company.

  Jlynmiller★★★★★

• Had Cornerstone come out to service my AC unit before the heat hits. Clayton was great and will be using them again in the future. First time using Cornerstone, great interaction and service, will be using them again for future needs.

  Josh L.★★★★★

• Dak and Clayton are both amazing! Highly recommend them for all your HVAC needs.

  Rowena O.★★★★★

• Clayton and the installers were great!! They arrived at the allocated time they told me. They were all very professional and communicative throughout the process. I would recommend Cornerstone Air to friends and family. A++ service and quality.

  Sean S.★★★★★

• Great experience! Very helpful & efficient!

  Kris W.★★★★★

• I had a new unit put in today. The crew showed up on time and installed everything quickly. No problems. A well oiled machine. Perfect.

  Effie★★★★★

• Wasn't sure what to expect, but wow! From keeping us informed when the technician would arrive to doing actual inspection, cleaning, changing air filters and answering all our questions, double wow! Very happy with the level of service from Cornerstone Air. We did sign up for the service plan because when we need an HVAC expert, it will be great to have a known professional to contact for help.

  Ice Q.★★★★★

• Dak was knowledgeable and patient. Fantastic service!

  Munal M.★★★★★

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About Plano

Sources: U.S. Census Bureau. NOAA U.S. Climate Normals 1991-2020.