Delta Air Systems has been in the business of improving the quality of the environment in homes and businesses since the 1950’s. Our approach has always been to listen first –fully understanding your needs makes it simple to develop practical and cost effective furnace or air conditioning solutions. We service what we sell and sell only what we service.

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Please check out our IAQ pages & If you're looking to improve your home's air quality, call us & speak to one of our indoor air quality specialists. We are here to help! (519) 885-2740

Click for the BBB Business Review of this Heating & Air Conditioning in Waterloo ON

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Testimonials & Reviews

Serving Waterloo, Kitchener, Guelph, Cambridge & Surrounding area.

Delta Air Systems Ltd.
Based on 317 reviews
Eric H.
01:57 21 Jan 22
Our furnace stopped working during the coldest time of the year and we reached out to Delta Air Systems for a third opinion on our repair / replacement options. The two previous companies told us a repair was not possible / not economical and strongly pressured us towards a replacement. Meanwhile, Delta was able to identify a minor repair option while also presenting transparent quotes for replacement. We truly felt that Delta was honest, fair, and had our best interests in mind.Our experience with Delta (Kelvin, Zachary and Tanya) was amazing! We strongly recommend them and we will continue to use them in the future!
matthieu C.
14:27 19 Jan 22
I had a great experience with Delta Air, I inquired about a humidifier for my furnace. The sales team reached out to me and provided valuable information. The tech who installed it was super nice and the job is very well done.
Liz H.
17:23 14 Jan 22
Delta Air Systems was awesome to work with! Our furnace and ac were replaced in the summer and it happened to be on a day where the humidex was around 40 degrees. The installer shared that typically they install the furnace first and I guess I seemed a bit dismayed at that given that it's a two-day installation and the ac was going to be installed the second day. He was so great in that he said he would reverse the order of installation and do the ac first so that we wouldn't be without ac for a night. I was so appreciative of this. Talk about customer service! We get Delta to regularly check our furnace and ac to make sure they are running a maximum efficiency. A great company and I recommend their services and products.
Stephanie P.
16:45 11 Jan 22
Delta was amazing and easy to work with!! They were quick and very fair with their pricing! Jason was an absolute joy to work with!! We will definitely be calling again!
Natalia K.
21:57 26 Dec 21
We bought a Daikin ductless a/c and heat pump from Delta and the customer service was second to none. Tanya at Delta listened to our needs without trying to upsell us extra units. Our unit was on back order for a while but Tammy kept us in the loop and booked us an installation date quickly after the unit was available. Liam and Matt were our install team and they did a great job - very professional and pleasant guys, they installed the unit with far less disruption than we thought would happen.Overall, we are extremely happy with our experience with Delta, and would highly recommend them for your a/c and heating needs.
Mario H.
20:20 23 Dec 21
The whole process with Delta was seamless and professional. Jason in sales, Tammy in the office and excellent installation by Scott and his assistant Brady. Great work by all!
Sharon B.
15:23 18 Dec 21
It’s stressful when your furnace stops working in mid-December. And when the company you normally deal with tells you the parts needed are on back order until nobody knows when, and they have no one available to install a new one until sometime next year, well …My next call was to Delta Air Systems. I knew nothing about this company at the time but almost instantly realized I’d come to the right place. “Yes, we can install a new furnace tomorrow or the day after,” Tanya assured me, “if needed. I’ll be there to take a look in the next hour or two.”She did her best to see if repairs were possible, chased down when the parts were due to arrive anywhere in Canada and how long it might take so near to Christmas to have them couriered here. Given all the factors, we decided a new furnace was the best solution. She explained the options and the cost, arranged for installation, and later that day brought space heaters to keep us comfortable meanwhile.Less than forty-eight hours later we were back in business with a quiet (and warm!) new Lennox. Julian and Ben, the installers, arrived a few minutes before the time range we were given, they were efficient and tidy and left no trace behind that there’d been workmen in the house that day.The service we received from the entire team at Delta Air Systems was first-rate. We give this company our highest recommendation.
Danielle B.
22:50 17 Dec 21
My experience with Delta Air Services was nothing but super positive. Tonya, one of their sales associates saved me $7600 and Zak, a licensed Service Technician did a phenomenal service job that saved me $1524. I had a terrible experience with anotherlarge KW company and Delta made it right. I will never look further than Delta, I'll be a loyal customer from here on. Thank you Delta🙂
Sherry R.
19:26 08 Dec 21
After 24 years, our furnace had a violation which required immediate attention. Jason attended our home and explained what we needed based on the size of our home. His suggestions were reasonable and he explained the differences between products very well. We were impressed by his matter of fact approach.The head technician who attended the install was Steve and we were impressed by their attention to details. They layed rugs to walk on and wore booties and when they finished they left everything clean.We would highly recommend Jason and Steve as the go-to team!
Genevieve H.
21:11 25 Nov 21
Tanya was my first point of contact with Delta. She came for an inspection of our old systems to give me a quote for a new furnace and a/c. She was very professional and on time. She took a detailed report and followed up with a detailed quote with 4 different payment levels. Julian and Ben then came to do the installation. They too arrived on time and completely their work in a timely fashion. They took the old furnace and a/c with them and did an excellent job cleaning the job sites. Both were polite and professional. I would definitely use Delta again in the future.
Nicole K.
20:02 24 Nov 21
Delta Air Systems were great to work with. Cole was very responsive and helpful in determining an AC and heating system that fit our needs and replaced our 25 year old system. Tammy was very helpful in booking us in quickly so that we could have heat in our home. The installation crew, Jason and Andrew, did a quick and clean job and were very professional throughout the installation of removing our old system and replacing it. Our family highly recommends Delta Air Systems and we are happy with our new Lennox system.
Tim S.
15:45 12 Nov 21
We had a Lennox furnace and air conditioner installed by Delta Air Systems and are very impressed with their service and well organized approach throughout the whole process. From the beginning, with a written concise quote from the sales person to the professional approach of the installers and production schedular, this company was top notch.One other review mentioned covid protocol, but I found that the installers kept their distance and wore face protection. Worked for me.The installers gave us a brief review of the furnace and the thermostat when the instal was complete, but be prepared to spend some time learning the system if you purchase the S30 thermostat. It is not difficult, but requires homework.Over all a good experience and I would highly recommend Delta Air Systems. As for the Lennox product, so far so good, but the real text will be in efficiency and reliability in the long run.
Ron A.
18:18 04 Nov 21
We have had the new system for a week and have already noticed a huge difference in the comfort of our home. The produce is well worth the money. The staff that came to do the quote was very professional and very knowledgeable about the equipment. The installers were also great to have in the house. They were polite and very professional in their work. They took time to let me know everything i need to know about the new equipment. Would highly recommend this company to anyone needing new furnace or A/C.
Lori L.
19:09 23 Oct 21
Just wanted to share a fantastic experience. We got home to a cold house last night and Kelvin at Delta Air Systems was so helpful. After a failed attempt to get through on the phone, Kelvin called us right back and through facetime very patiently walked us through the problem. With his help we located the issue and got the furnace up and running. He went over and above, in my opinion, on a Friday night after hours. We have had work done with Delta Air Systems in the past and last night was another positive experience.
Matthew D.
01:14 07 Oct 21
Cole, Julian, and Ben were super easy to work with. Great quality. No fuss. I'd recommend them any time.
Robert K.
14:35 02 Oct 21
My 87 year old mother-in-law's furnace was shut down due to a crack in the combustion changer. We called Delta and explained the situation, including the fact that the weather was turning cold and the furnace was needed to warm the house. Jordan at Delta immediately sent Jason over the next day to give us a quote on a new furnace. Due to the cool weather, Delta had many customers waiting for service and installations and that it would probably take a week before an installation could occur.That same evening, Tammy from Delta called to say that the installation could occur the next day ! We jumped at the chance, and on the following day a brand new furnace was installed by Delta's installation crew of Julian and Ben. They did an excellent install !Delta Air Services is an excellent company. They very much care for their customers. I want to thank Jordan, Tammy, and Jason for their expertise, and thank Julian and Ben, the Delta installers, for a profession install.
Sandy K.
16:07 23 Sep 21
Delta just replaced my 15 year old furnace and ac with a new Lennox system. The entire experience; from the estimate and my many questions answered by Cole, to the install by Ben and Julien, to paying my invoice with Tammy, has been 5 stars. Julien and Ben were friendly, knowledgeable, and always professional. Delta delivered what they promised, on time and on budget. They looked after warranty registration and will schedule annual maintenance to ensure my purchase operates the way its supposed to for many, many years. Kudos to everyone at Delta! Thanks for an excellent job.
Ed D.
18:53 18 Sep 21
It was my 25-year-old furnace, and a casual question over dinner with friends, that led me to contact Delta Air Systems. My friends stated that Delta was, simply, “the best”. A quick e-mail to the owner, a quick phone call in return, and Tanya was at my door for a site visit and quotation. She was incredibly knowledgeable, spent time to explain various features and outlined my options. We then completed the ordering process by phone and e-mail. Because of upcoming travel plans, installation was deferred, but suddenly an opening occurred, and Jason and Andrew arrived to install the new furnace and air conditioner. These gentlemen were efficient, incredibly knowledgeable, and prepared, and within a day, I was back up and running. As someone who is familiar with the systems in my house, I was beyond impressed with their work. They even tidied up some of the pre-existing electrical and plumbing connections around the furnace, and the resulting work was exemplary. After an introduction to my new smart thermostat, I was ready to go! The follow-up from Tammy at head office was wonderful and she even wished me a safe trip! Oh, and the time from the initial referral to the complete installation was less than two weeks. The entire experience more than exceeded my expectations. Every member of the team took all the necessary precautions because of COVID as well. It with absolutely no hesitation that I unconditionally recommend Delta Air Systems.
john A.
17:02 18 Sep 21
Great ! friendly prompt service. Recommended.
Peter Bush (.
13:33 17 Sep 21
Julian and Ben installed our new furnace. They were professional,knowledgeable and very hard working. Great attention to detail and went the extra mile to do the job right and to their satisfaction as well as mine. Cole was my company contact initially and was very courteous and knowledgeable. He answered all of my questions promptly and to the point. Great experience overall.
Henry W.
08:06 27 Aug 21
Fast service same day service when our fan on the furnace had failed in a heat wave.The staff are very friendly and professional.Thank you.
Don V.
19:44 26 Aug 21
Megan was here to do an inspection on my furnace and air conditioner.She did an excellent job and I would be pleased to have her come backat anytime to do any work that is required!
16:16 17 Aug 21
The technician who came to repair our AC unit was friendly and helpful. She took the time to explain the process and reason for the repair. The prompt and professional service is why Delta would get my business in the future.
Jennifer A.
21:52 06 Aug 21
I would highly recommend Delta Air Systems. We had them install a heat pump on the main floor of our house and we are extremely happy. Jordan provided us with a quote and walked us through our options until we felt that the system met our needs and our budget. Jason and Andrew installed the system and were very professional and efficient. The team answered all of my questions and I felt like I was getting good value. Definitely 5 star service!
Terry W.
00:08 23 Jul 21
We used Delta to purchase and install a new Lennox AC and furnace. We had a great experience with our sales representative, Cole, who provided a clear recommendation on product options and a competitive price (we had four companies quote on the job).Ben & Julian installed the kit last week over a couple of days and again were professional and friendly throughout. We required some tricky pipework in our basement around a joist as well as a new return and the guys stepped up and did a great job.Having spent weeks researching products and installers we're happy to have the job finished - based on our experience, we'd happily recommend Delta.
Wendy M.
13:27 20 Jul 21
Tanya offered expert advise and guidance on replacing my existing system. Steve and Kyle were very efficient and professional with the installation. They explained what they were doing and kept a clean work space. They were both very considerate of my home.I would highly recommend Delta Air for your residential air systems.
David McKee (.
19:29 12 Jul 21
Installed *ahead* of schedule, in the rain, and in only a couple of hours. Fantastic job. Special thanks to Scott & Brady on the installation team for getting stuff done.
Seth B.
17:27 07 Jul 21
Top notch team of professionals. Delta air systems should be your go to in the kitchener, waterloo, guelph regions. Hats off guys!
Edith L.
13:28 01 Jul 21
I had a Lennox furnace/AC installation with Delta Systems a few months ago to replace our 22 year old unit, and just got around to leaving a review. The team was absolutely amazing; the best people I have ever dealt. First off, due to Covid, I wanted to limit in-person interaction as much as possible. As such, everything---from checking the configuration of my furnace room, to deciding which units to purchase---was handled/decided over email and video calls with Jordan. Jordan is extremely patient in answering all my questions (and I ask a lot of questions); she's quick to respond to emails, clear in her explanations, flexible, personable, enthusiastic. The installation went smoothly and was finished within 1 day, and I mostly communicated with the installation team (Jason & Andrew) by phone. They sent another technician a few days later to start our AC when the weather warmed up; again contactless. Tammy handled the payment and warranties promptly. The whole process was *so* smooth and transparent, in part due to the excellent communication between the whole team (for example, Jordan passed on my instructions to the installation team, and everything is documented on their online system). The quotes are also reasonable; I have compared a few quotes from other companies before going with Delta. I was quite nervous about getting such a big job done while the pandemic is still going on, but the Delta team made my family and I feel extremely safe. It has been a few months now, and we haven't experienced any issues with the new heater/AC system; it is quiet and comfortable. Highly recommend Delta Air Systems to anyone who might need heater/AC installations.
Scott H.
15:26 30 Jun 21
Best experience I've had with a company that I can recall from the person that answered the phone to the people that came to my house to the installation team that were courteous and efficient. Installation much earlier than promised. I will never deal with another AC company and recommend them to all my friends.
Chris P.
01:05 30 Jun 21
Installation of furnace and air was not without many challenges that Julian and Ben resolved. Their professional and determined attitude was amazing. This team was awesome. Thank you!
19:55 25 Jun 21
Thank you for the excellent job Julian and Ben when they install my new air conditioner and furnace!.Also to Tania , who has a lot of experience and pacience to explains all diferents options.I am glad they are in this city!Best choice in Kitchener!
Scorpion P.
02:43 17 Jun 21
Well to be honest, I have never really written reviews in the past. I had called in for a quote for AC install and Kelvin came to my house. I must say he’s one of the most honest (I swear by God) and the most knowledgeable guys I’ve ever met. I had done a quote before this from Costco guys and they straight up recommended me installing a 1.5 ton central AC without much thinking(lived up to their expectations, really). One of my friends who’s also a happy customer of Delta Air Systems recommended me to give them a try. Kelvin explained to me the mechanics of how the AC, the cold and hot air works and pointed out that my house wasn’t just built of a central AC. (Yea, I just bought it and it’s fairly old) For me to accommodate the AC and get it to work efficiently , I’d be looking at a decent renovation which would easily burn my pockets just to get an AC installed. He knew his sale was going down the drain but he still took ample time to make sure I understand why he thinks it was a right decision to not to go for it. He could’ve easily beat the Costco quote and had his sale done, but he didn’t and that show’s there are still good people around in the world.What he gained though?Let me say this, if anyone asks me which is the best dealer for heating and cooling in KW area, my answer (for life) would be the “Delta Air Systems”. I am still feeling so good that I met a genuine human being who cares. Thanks Kelvin! (And Josh and Jordan). Totally happy.
Michael C.
23:01 08 Jun 21
Great experience. Cost effective and good service.
Arthur H.
13:38 08 Jun 21
Tanya provided the best quote experience of 3 requests. Vince and Dakota were on time and performed an outstanding installation . I was able to get a furnace so that my air conditioner would be able to work over a very hot weekend. They explained the systems and gave me instructions on how the new unit will work with my installed accessories (humidifier , air conditioner). I wish to thank all that were involved with this installation for their great work and professionalism.
Brian N.
16:37 28 May 21
Megan was great she had the issue fixed and unit running quick . Very professional
Becca A
13:44 28 May 21
What a wonderful experience; from the quoting phase (Josh) to installation (Scott & Brady). Professional, helpful, great quote, friendly. The install went smooth and was very quick. I would definitely recommend Delta Air!
Thomas J.
00:11 28 Apr 21
Very happy with their service, reliable and trustworthy, and happy to recommend. They installed our air-exchanger last year, and a new AC unit this year. Both installations were completed very well, fast and within the quoted cost. We also have their regular maintenance plan for our AC, furnace and fireplace. Their service and installation technicians are all great, did a thorough job either installing or maintaining our units, and also have patience to answer any of my questions or concerns.Highly recommended.
Johnson Y.
14:42 21 Apr 21
The entire crew (service - Meghan, sales - Josh/Tanya, installation - Steve/Liam) was very professional. The passoff from service to sales to installation appeared seamless (in spite of the challenge with interruption to their business internet/wireless service). Each of them took their time to explain the diagnosis, the options (providing the time for me to digest and decide what to do), what they are doing, what I need to know/do post-installation; above all, the covid protocols they are practicing/adhering to.It is comforting and much appreciated.It is very nice to know that we can support one of our local businesses.
Cathie W.
13:46 16 Apr 21
Thank you so much for the great service during COVID. Meghan was polite, professional and prompt. Thanks Delta for always taking good care of us. Cathie
Hendrik W.
23:52 13 Apr 21
Cannot recommend DELTA AIR enough! Got a new HVAC system installed back in October and the furnace had been running perfectly ever since. The air quality feels amazing! Just got our A/C started up a week ago as the temp was too low at the day of installation.The entire DELTA team (owner, sales rep, installation team, and service technicians) was amazing, friendly, knowledgeable, and super efficient.Highly recommend their service and looking forward to many years of good quality air in our home!THANKS AGAIN!
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Delta Air Systems Furnace, Air Conditioning, Ductless HVAC repair and services in Kitchener, Waterloo, Cambridge and Guelph. Get comfortable for less!

Delta Air Systems has been in the business of improving the quality of the environment in homes and businesses since the 1950’s. Our approach has always been to listen first –fully understanding your needs makes it simple to develop practical and cost effective furnace or air conditioning solutions. We service what we sell and sell only what we service. That’s why we deal only with the top brand names in the industry – Daikin and Lennox. Heating, Cooling, Air Conditioners, Furnaces, Fireplaces & More. Established HVAC manufacturers with products that are certified, tested and approved and come with the best warranties in the business. Delta Air Systems has passed the Lennox Quality Dealer Standards Program and is a certified Daikin Comfort Pro. It is a commitment to excellence through top quality customer service consistent in all participating independent dealers. If your looking for furnace or air conditioning service, repair or replacement in Kitchener-Waterloo, Guelph or Cambridge areas look no further than Delta Air Systems.

We service what we sell and sell only what we service. That’s why we deal only with the top brand names in the industry. Established manufacturers with products that are certified, tested and approved. Furnace, heat pumps and heating repair, replacement, installation and servicing in Kitchener-Waterloo, Cambridge & Guelph. Call us to discuss GreenOn rebates and incentives programs. You could be eligible to save ALOT!

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