Eric M.


I had a great experience with KNZ. Within a week I was able to get a quote and brand new AC installed. Everyone I interacted with was friendly, and I’d recommend them!

Robert K.


Nick and Zack were very professional and completed the installation flawlessly and in a timely manner!

Chris M.

“Had a problem with our furnace that was new in 2015, when the house was built..water was dripping out of the furnace..the furnace was not installed by KNZ, but we did not want the original installer..we called KNZ and the lady in the office said all the guys were out, but she would have someone stop at our home later that afternoon..We got a call from the repairman, and he said he was finishing on a service and would be over in about 30 minutes…About half hour later the serviceman showed up..he took our furnace apart and it seems it had been leaking for a while, as the parts were rusting..long story short, he repaired the leak, cleaned and checked the furnace and we’ve been good ever since..He was very neat with his work..cleaned everything up, and thanked us for giving them a call…KNZ gets a big thumbs up from a couple seniors…”

Mia G.

“KNZ saved us! Our heat was not working at the office with temperatures at record lows, I called KNZ and they cld back asap to let me know they’d be out in an hour. They made it here in 45minutes. Our guy was personable, fast and got us going within the hour. My coat is now off inside and we can see patients again. Thanks KNZ!”

Christine M.

“A neighbor recommended I call them, and I’m glad she did.
I called the office and the lady was very patient and knowledgeable..she asked questions about my problem and gave me ideas on what to check..it turned out my thermostat was messed up..The man came, checked it out and replaced it..then he also checked out my furnace and air..he was so nice.. being a lady in her 70’s..the service guy made me feel very comfortable..I would definitely recommend KNZ.”

Bridgette R.

“Excellent customer service! They were called by my landlord to fix a furnace issue. The lady in the office who set up the repair appointment was so kind and helpful. The guy who came for the appointment was on time and very professional. He was mindful of COVID and protecting us as well as himself which I appreciated. He did a thorough job and made sure everything was working before leaving. He also explained to me everything that he did. I highly recommend.”

Lauren D.

“Respectful and clean crew. They did very great, thorough work and they even left my basement cleaner than they found it. Couldn’t recommend them more!”

Karen C.

“I called KNZ because my grandparents heat was out. They came the same day and got their heat running quickly and reasonably priced. The technician was very patient and answered all of their questions. We will definitely call KNZ for all our heating and cooling need.”

Jackie Q.

“Wouldn’t use anyone else! Keith is great- very honest and knowledgeable! I use KNZ for my home and business. Keep up the good work!!!!”

Bob and Lois B.

“Very prompt and friendly service would recommend them anytime!”

Jessica A.

“Nick came out to work on my AC and was very kind and respectful. He was very patient with me as he explained the problem and the solution. I will be calling them again!”

Mary B.

“Definitely a 5 star rating for excellent professionalism and timeliness. During the June heatwave, my 20 year old A/C unit died. Within 24 hours, KNZ had installed a new one.”

Steve M.

“We needed to replace our furnace and got quotes from several local companies. KNZ offered excellent brands and very competitive prices. The owners are friendly and knowledgeable. The service was prompt and efficient and courteous. We are very happy with our choice of KNZ.”

Kim D.

“I’m as happy as a clam and will use this guy on a regular basis.”

James V.

“Came to house looked over the old furnace installation made all necessary measurements and prepared a quote and scheduled installation before he left. Called the day before the installation to confirm date and time with us. They arrived the next morning at 9:00. Brought 4 people. Removed the old installation inside and out. Removed old equipment from basement and back yard. Installed New Furnace and AC unit. Installed Air conditioning lines, Piped Gas and Electric to the new unit and tested both the Air Conditioning and Heating. Cleaned up all work areas completed paperwork, and left by 3:00pm. Very Satisfied with their work. All work is neat and professional looking.”

Jim K.

“Follow-up service paramount to excellence.”

Jim K.

“We did our own research and found the best company in the area! It was a pleasure doing business with you, Keith; we thank you and your staff for the great job. We will definitely recommend your company in the future.”

Gerrit D.

“Thanks so much for the “white vents” and for your info on the “dehumidifier” and have outside vents open for the crawl space. Warmest Regards.”

Jim C.

“As a retired Thermal-Mechanical engineer. I can attest to the fact that KNZ is a complete and professional HVAC systems contractor. KNZ was competitive (second low of five bidders), the only contractor that figured out how to reasonably install the top efficiency furnace, and removed an uncomfortable draft and temperature differential problem we’ve had in our home for years.”

Tom and Janell D.

“KNZ You did a great job of removing our “old” furnace and replacing it with new. The men were prompt, courteous and did a good job of cleaning up. We are enjoying our new furnace and central air. We would use your services again, but we hope not for a long time. We would highly recommend your services.”

Pam D.

“Just wanted to Thank-you for getting our job done as fast as you did. Thank you.”

Rev. Lawrence E. Sinick

“Dear Mr. Miller
We at the Apostolics of Lowell would like to extend our gratitude for the wonderful new furnace and air conditioner. The price was very reasonable and your installation crew was very diligent. They made sure everything was done right.
Our church is not very large, and in this economy, contributions are not enough to meet all of our needs. This fact makes us apprecaiate KNZ for giving us a very reasonable price. I can surely recommend KNZ to others who need kheating or cooling service or sales.
May God bless you for your kindness.
In Jesus’ Name,”


“KNZ installed a server room air conditioner for us quickly and professionally. Much appreciated Keith, hopefully I don’t have to call you any time soon, but if I do I know you’ll have me taken care of.

Lois B.

“Woke up in the AM had no heat. Called KNZ heating they were quick to answer the phone. They were fair with their priceing, prompt , showed up in the time frame that was givin. Thanks for taking care of us.”

Kris G.

“Very nice experience working with KNZ. Steve was very polite. Took the time to explain the problem. Same day service with only a 2 hour window. Didn’t have to sit home all day waiting.”

Chris M.

“On one of the hottest days of the year, and being the 4th of July, we called KNZ and they came out and fixed our airconditioning, we can’t say enough about how happy we were with the service and the serviceman was very courteous. Thank you KNZ”

Matt M.

“You can always count on K n Z to get the job done, and get it done right. Much thanks Keith – A+ service and a true professional!!”

Mitch M.

“KNZ is the contractor used by our builder. Kieth came in and talked to us about how we going to use the rooms. He then went through the plans and with our input, put together a comprehensive plan to make best use of the heating and cooling system. The craftsmanship and professionalism of his employees is the best I have seen in years. The follow up has been excellent this fall kieth stopped by to check on everything to to make sure everything was still to our liking.”

The information on this website is for informational purposes only; it is deemed accurate but not guaranteed. It does not constitute professional advice. Testimonials are not a guarantee, warranty, or prediction of what your experience with us will be. By providing certain contact information herein, you are expressly authorizing the recipient of this message to contact you via the methods of communication provided.

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