HVAC reviews in Greeley, Colorado

Angelo and David, the HVAC technicians who installed the new furnace, were very efficient, polite, professional, and respectful of my space. They installed the furnace in about 4 hours. Angelo took time to explain furnace operations and answer all questions. Excellent work!

These guys are so amazing! They really know what they are doing! I was working from home all day with them! Very professional and so clean! They laid drop cloths everywhere, cleaned up every speck of dust! They are so respectful, so quiet and just all nice guys! Justin, Jason, Angelo, David are the best! Definitely recommend them!!🙌🏻

Justin was timely, friendly, thorough and helpful in explaining the problem and getting our furnace working correctly really quickly. Trustworthy vibe 10/10

My heater went out during the days it had snowed and Miracle was great at getting someone out here quickly! She was very sweet over the phone, I’m almost 60 yrs of and talk slower and she not once rushed me or sounded frustrated. Keep it up Miracle!

Had technician Angelo to install a new furnace. He was very experienced, knowledgeable, and efficent. Exceptional rewiring and placing new stand. He double checked all hvac system and walked through system for further understanding. Then went through warranty information as well. Was able to answer all questions. Also very clean, nothing left behind. Did such a great job, would recommend requesting him to be your tech. Guy deserves a raise for sure. Company was great to work with, timely, and professional. If I have any maintenance issues these are the guys I'm calling.

It took a while to get all the parts for my furnace replacement but David &Jason did a really great job at the installation. It took them all day because the PVC exhaust/intake pipes had to be replaced. They had checked that out previously and came totally prepared. They ran new wiring to my new thermostat since the old wiring was insufficient two wire. They cleaned up totally after themselves and answered all my questions.

Edit: 1/14/2026

We had another emergency at our current home two days ago and McCormick came same day and two days later installed a new motor and got us up & running. Techs were amazing - wish I got their names. Another thing to note was they originally quoted us $250 for the same day service call & diagnostic but called back to say that they had time and since it wasn’t going to have to be off-hours, reduced it to the normal service call fee. Professional and outstanding service through and through.

Original Review:
We had our condo on the market with an aging HVAC system, and after a routine maintenance check it became clear the unit needed replacing. Our experience with McCormick was excellent from start to finish. Even though it was peak real estate season and their schedule was packed, they understood our situation and made it happen. The new unit was ordered and installed within a week.

Their pricing was competitive, their team was professional and responsive, and they promptly addressed every question we had. It’s easy to see why they’re so highly rated. We would absolutely recommend McCormick and will continue to rely on them for all of our HVAC needs.

Our furnace died last week and temps were dropping McCormick Heating and cooling responded quickly and courteously to our problem. Our furnace was replaced quickly. Our two technicians, David and Jason, were here on time and quickly did their job. My heater is working. David and Jason were polite, professional, and efficient. I would recommend them in a heartbeat

Called these guys based on the Google reviews, and now I can see why their reviews are so high. The level of ease that this company gave me when I called for information about replacing my furnace. I worked with Destiny, when I called, I was almost frantic, but after talking the to her I felt confident that she would do everything they could to help me. She answered all of my questions and walked me through what this whole process is going to look like. I strongly recommend using this company!!!

Great Experience all around from the first call! working with my sales coordinator Kay!!! she made a stressful situation very easy from my questions all the way to my purchase and installation. A friend of mine recommended and I’m glad they did , there’s lots of places out there save your time and just go to McCormick heating and cooling …

Josiah, David and Angelo couldn’t have made it easier and less stressful to replace our 31 year old dead furnace. Josiah took the time to explain our options thoroughly and walk us through the process. He was never rushing during the process nor pushy towards choosing one furnace or another, took time to answer every question we had. Installation day arrived with David arriving first. He placed drop clothes through the house to where the crawl space is located. Angelo showed up with the new furnace and they started the process. Five hours later the new furnace was installed and running. The house looked the same as before they arrived! Nothing left behind nor was anything damaged or dirty. All three were very professional, friendly and respectful! I would recommend McCormick to family and friends. Job well done gentleman. Thank You!!

Angelo was very pleasant to work with. He made sure I new about the modification needed to get the old unit out as well as the repairs made. He showed me pictures of the work. He made sure I had detailed instructions on how to register me heater for the extended warranty.

Justin and David were amazing installers!!! They were professional and patient with my dogs in the house. After the job was finished they throughly explained how the furnace and A/C works, as well as cleaning maintenance and the warranties. Best experience I’ve had with installers and wish them all the best!

Angelo and David put a new furnace and air conditioner into our home.
They were professional, efficient, and answered any and all questions that we had. We got a very good tour, an explanation of all the things that they did, what the furnace does and how to operate things. Very impressed with this company! Kay in the office, has been helpful, friendly, genuine, and so easy to work with. She is taking care of all the paperwork, inspections, and anything else that comes with getting a whole new system in our home
I highly recommend this company, especially with this big project. It can be scary and costly to get a brand new furnace and air conditioner, and Mccormick has made this easy to schedule & professional and good at this job!!

Highly recommend McCormick Heating & Cooling everyone in the team was so nice and efficient in getting our furnace replaced before the cold weather. Angelo& David are great techs and got it done quick! Very pleased with the installment and the explanation of everything! We got estimates from a few different companies but McCormick was definitely the best choice! Thank you again!

I had an excellent experience with McCormick, Josiah and the other tech who's name escapes me did an excellent job. They were extremely knowledgeable, and took the time to figure out the issue and the solution. The work was done efficiently and professionally, and everything was left clean afterward. Honest pricing and great customer service—I would absolutely recommend them to anyone needing HVAC work.

Justin was incredibly helpful and communicative on what was happening with our furnace. Diagnosed and fixed the problem, and gave us a few other recommendations for other things he noticed while working on it. Great experience!

Working with Destiny was honestly one of the best customer service experiences I’ve ever had. She made the entire process of getting my new furnace set up feel easy and stress-free. Not only was she incredibly friendly, but she knew exactly what she was talking about. Every question I had — and I had a lot — she answered clearly, patiently, and in a way that actually made sense.

You can tell she genuinely cares about helping people and making sure you feel confident in what you’re buying. She walked me through all the details, things I wouldn’t have even known to ask about, and really made sure I understood my options.

Destiny went above and beyond from start to finish. If you’re looking for someone who’s knowledgeable, professional, and truly amazing at what they do, Destiny is the one you want to work with. Couldn’t recommend her enough.

I’ve been using McCormick for 7 years now- they are very skilled at working on my non-traditional HVAC mini split system and have consistently saved me money over other companies. Josiah was able to diagnose and fix my heat issue on the spot! Thanks McCormick!

I had a great experience with Miracle she made booking service appointment easy and was very patient. Service was handled efficiently and professionally. Communication was consistent, timelines were met, and the service felt dependable and stress-free. Highly recommend McCormick for anyone needing fast and reliable HVAC services. Great customer service!

Angelo and David were absolutely fantastic from start to finish. They arrived right on time and came fully prepared. They were incredibly knowledgeable and took the time to explain what they did and why, which made the whole experience feel smooth and stress-free.

Their professionalism really stood out—respectful, detail-oriented, and clearly committed to doing the job right. They worked efficiently, kept everything clean, and made sure the system was running perfectly before they left. I truly appreciate the care and pride they put into their work. We were especially thankful they were able to come out on a cold Saturday and get our heat working!

Highly recommend McCormick Heating and Cooling, and especially Angelo and David, to anyone needing HVAC installation/service. They exceeded all expectations!