Greentech Engineering Heating & Air Conditioning

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“Greentech installed two brand new Daikin systems for us (AC + Furnace) in August 2024. As of Jan, 2026, we had contacted GT a few times on various issues. The communication has always been smooth. GT's response was timely and professional. This review is for the most recent visit by GT technician Mr. Jennings on 1/27/26. Since Dec. 2025, I started to receive email from Google NEST reporting that the room temperature has been dropping even heating is "on". The flames would shut off after about 5-10 minutes with error code E33. I contacted GT about the issue on 1/24/26. Since it was in the middle of the winter snow period, GT could not immediately dispatch a technician due to road condition. On 1/27/26, Mr. Jennings was finally able to come even the road condition was still icy. After spending about 30 minutes, Mr. Jennings was able to amend the problem. According to him, he adjusted the fan speed so the system would not overheat and consequently shut off the flames. The service charge was $80, which by itself is reasonable thou this is my first time ever calling for a HVAC service. However, I would think such fan speed and pressure settings should have been done correctly during installation. I contacted GT and they agreed to refund the service charge. I would highly recommend GT. They offer very reasonable prices and backed up with great customer service. One suggestion to the installer is the installer should sweep clean the metal shards left inside the unit as there are exposed electronics. If the shards got picked up my high pressure air flow, there could be risk of shorting. See pictures.”

“Been working with these folks since 2016. This is THE best HVAC company in the DFW area, period. Fast, efficient and professional. They respond to you quickly and their technicians are very good at their jobs. For the few times they work with me, they always excel at repairing the parts and explained everything crystal clear, no shady bizes. While their price is already very competitive, they often offer generous discounts on promos. Their customer service is excellent too. They will follow up on you for your opinion on the projects and services, very nicely. 6/5 highly recommended will keep doing business with them as long as I live in Dallas.”

“I purchased this house in July of this year, and shortly after, my system started leaking refrigerant. I contacted several contractors for quotes and possible solutions. After doing my research, I decided to go with Greentech Engineering Heating & Air Conditioning. I chose them for several reasons: Transparent Pricing: Their pricing and proposed solution were very reasonable. There were no hidden charges and no hassles throughout the process. Right Solution, No Upselling: The solution they provided met our exact needs without any unnecessary upselling. Thank you to Shen Chi and the team. Excellent Communication: Their communication was much better than other local businesses, and they even offer weekend support. Punctuality: They arrived on time for both the quotation day and the installation day, which I really appreciated. Attention to Detail: Some contractors walked on my floors without shoe covers, but Shen always arrived prepared with shoe covers and was consistently polite and professional. During the HVAC installation, the team used mats to protect the floors. Overall, I am very happy with their service.”

“Before summer hit, I requested tune up two of the AC systems in my house. Fortunately, I had the AC unit checked up before the hot summer. Unfortunately, one of the AC unit needs to be replaced due to the end of lifespan (21 years old). One of my friends recommended Greentech based on the price, quality and service. I was happy that I follow my friend's advice. Lucas showed up in 2 hrs to check the AC unit after receiving my call. He was very patient in listening my concerns. Then provided professional recommendations. At the end, he provided a report of the options and convinced me that his company could provide the best price for the quality of the product and the service for installations and maintenance. As promised by Lucas, the Installation was very professional. Two installers came on time, remove the Old AC unit, replace the new one and test the unit to make sure that the new AC system was working fine in 4 hrs. No mess up, no dirt left on the floor. All in all, I am very happy to choose Greentech to replace my AC unit. If you are looking for a contractor to replace AC unit, Greentech is a very good option to consider.”

“Our home heating system broke down during the late-January Dallas ice storm, and the indoor temperature dropped to 51°F. GreenTech responded immediately to our call and dispatched a technician to evaluate the problem without delay, despite the icy roads. Based on the evaluation, we decided to replace our 25-year-old heating system. Chi Shen, their Technical Supervisor, came on-site to assess and prepare for the installation. He clearly explained the replacement options and patiently answered all of our questions until we felt confident in our choice. The very next day, the installation crew arrived and completed the job professionally and efficiently. We are extremely satisfied with the entire process—from the first phone call to the final installation. Their communication was prompt, clear, and professional, with text messages to confirm scheduling and email quotes for pricing. We’ve used GreenTech’s services several times for both our residence and rental properties. They’ve earned our trust and have become our go-to company for all HVAC repairs and installations. Highly recommended!”