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

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Testimonials & Reviews

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

Delta Air Systems Ltd.
Based on 294 reviews
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!
Sourov D.
13:45 30 Mar 21
I highly recommend working Delta Air Systems for your HVAC needs. We replaced our furnace this year and worked with John and Kelvin to decide which furnace system was best for us. I called 5 HVAC companies to do site visits and give us quotes. John and Kelvin were the only ones that went into deep analysis taking into account the age of our home, our plans for a home extension, etc. Most other HVAC companies suggested we get a 60K BTU furnace but John and Kelvin recommended that we needed an 80K BTU furnace. After talking our construction company and getting a second opinion, they agreed a 80K BTU furnace was necessary. John and Kelvin were right, which showed me that they wanted to get us the best solution and not just make the sale for the lowest price.We went Daiken 80K BTU Modulating furnace. Our previous furnace was loud so we wanted one that was quiet. The Daiken is quiet, the DaikenOne thermostat and app works well. We like that there's a 12 year warranty with Daiken too. Overall we're happy with it.The installation went well with Delta. The installers were professional and finished the job within a day. I appreciated that put down floor covers so that dirt didn't get on the floors.We ended up paying a little more with Delta versus other HVAC companies we compared them too, but it was worth it.
Michael B.
16:50 29 Mar 21
Had Delta install an HVAC system and water heater. The quote was competitive, and they worked with us to find the right system for the job---no up-selling anywhere along the way. Quick turnaround with the booking, and the install was thorough, with minimal distruption. Steve & Kyle also took the time to explain to us what work they'd done, what each part of the system did, and how to maintain it. They were also able to quote and install a BBQ line on-the-fly, offering a sizeable discount on the line because they were already on-site. Highly recommended!
Pat D.
11:36 28 Mar 21
Communication was great from start to finish, everything was well-explained and options were outlined. Quote received same day and install a few days later. The technicians were courteous and did a great job on the install.
Maria Del C.
18:32 24 Mar 21
Jason and Andrew did a great job at installing my new furnace and AC. They were on time and very mindful of my space as I worked from home throughout the day. Everyone I dealt with from Delta Air Systems was extremely helpful and responsive. We were able to get everything set up after a week of being in touch with them as my furnace was failing and I needed a new one ASAP. I'm very happy with Delta Air's service.
Breann K.
11:24 24 Mar 21
Quick service & best price - had a quote done and a/c installed within a week! They got a wonderful surprise when they found a hornets nest while doing install but they removed it for us! Their whole team was wonderfully professional and easy to deal with from start to finish. Thank you Delta - we can't wait to use our new a/c unit this summer 🙂
Tj F.
23:03 23 Mar 21
Had booked a routine checkup/cleaning for my 30 year old furnace, and Delta had Guy come out to inspect. Unfortunately he delivered some bad news regarding a crack in the heat exchanger and had to turn off the gas for safety. At this point I knew I needed a new system and had heard great things about Delta. Anyhow, John came out to quote us on a new HVAC system and hooked us up with electric heaters until the installation was completed. Monday morning the team came out and was here about 9 hours doing the job. The crew, Steve, Kyle and Brandon were friendly, professional and were willing to answer any questions I had. Full COVID-19 protocols were followed.The new system is working well and is so quiet.Fully satisfied with the experience with Delta
Linden G.
19:44 17 Feb 21
Friendly, on time, on complaints on the install.
Eric R.
14:36 17 Feb 21
I wish I could give more than 5 stars. Everyone involved in the install of a new Furnace and A/C for me was above and beyond. Tanya in Sales, Tammy in scheduling and Julian and Brandon who did the install were all top notch. I had an install scheduled and my original furnace broke down, they were able to do an emergency repair for me ahead of my install date which was a lifesaver and now that the new equipment is in its perfect. They are the only company I’ll call for any future heating and cooling needs. A++++
Warren C.
21:25 16 Feb 21
Delta Air Systems Ltd. recently completed another HVAC project at our home. We selected this firm because they had successfully three previous challenging HVAC projects at our residence. Delta had earned our confidence with their previous work and we were not disappointed with our decision to grant them more business this time. The work was accurately specified, fairly priced and the execution of the job was first-class. The installation crew (Vince and Dakota) was highly experienced and capable, worked very efficiently and cleanly and left the job site in perfect condition. They took the time to fully explain proper operation and care for the equipment. Our sales representative also came by the job site to ensure the project got off to a great start. All in all, we are very pleased with the outcome. We would not hesitate to utilize this firm again and recommend them very highly to you.
Naseem K.
18:35 11 Feb 21
Exceptional customer service. Left Reliance for Delta. Furnace went out Friday evening and was replaced Monday morning. Provided electric heaters to tie us over the weekend. Liam and Brandon were amazing. Checked on us post-install. Highly recommended!
Wendy W.
12:41 08 Feb 21
I got a great quote right away and the company had my new humidifier installed within two days. They were professional, helpful and showed me everything afterwards. Love Delta!
G C.
23:10 04 Feb 21
Staff are very friendly, responsive and helpful. Was quoted a reasonable price to install a furnace filter with associated ductwork changes. I was familiar with component pricing from the Internet and was very pleased to note that there was absolutely no price gouging here!I came to Delta Air Systems for a quote because about 5 years ago it was looking like I may need a furnace replacement and I started soliciting quotations from all the major vendors in town. I found back then that Delta not only gave me one of the best quotes (in fact for a genuine brand-name system it was the best quote), but they were the most thorough in evaluating our heating needs. It turns out that my furnace didn't need replacing after all, but I remembered how impressed I was and didn't look anywhere else to get our current work done.When my furnace does indeed need replacing, I know where I'll be calling!
Charles P.
21:16 22 Jan 21
Great to deal with, from getting a quote to final cleanup after installation. Can't say enough. Tanya is knowledgeable, courteous and gave a competitive price. Jason & Andrew are polite, efficient and meet a high standard of workmanship as well as being considerate and very tidy. Last and certainly not least is Tammy who has a wonderful phone personality. Thank you to all at Delta.
Garfield S.
02:20 20 Jan 21
We have used Delta Air Systems for service and purchases for about 14 years. Appliance service rates a 10 out of 10. Customer support rates a 10 out of 10. Sales rates a 10 out of 10. Installation team rates a 10 out of 10. We had our annual schedule furnace maintenance done on 01/18/21. John the technical had to inform us that the heat exchanger was broken and the furnace was expelling a dangerous amount of carbon monoxide to the outside of the house. This was a safety issue and the furnace had to be shot off. John told us our options of repairing the furnace or replacing it. He contacted home office to get quotes on both. While waiting for this he had them check if the exchanger still had a warranty as the furnace was 2 years past the warranty date. John informed us that the part was no longer available and the manufacture had a program to apply a rebate on a new furnace since the part was not available. My wife and I had already decided it would be best to replace the furnace and have a completely new unit and a new warranty. John immediately asked that a salesrep come out that day and go thru the heating products and the rebate the manufacture would apply. Josh from sales went thru all the information and gave us a rundown of the products available and what was the best in efficiency, quality, and best price with rebates. Josh explained everything and gave us several quotes. We went with his best recommendation and at the time asked that a humidifier be added. Josh did this and also applied a discount to the price. He arranged for next day installation. On 01/19/2001 Liam and Matt arrived with our new furnace and humidifier. They were very courteous and explained the installation they were doing. They answered all our questions about our new purchase and went out of their way to show us everything and how it worked. The installation went smooth and without interrupting our routine. They ensured the floor was covered by tarps and when finished ensured everything was cleaned up. A first class installation. We now have noticed that our house is warmer than before, so we realize that our old furnace was definitely not working up to peak and that it needed replacement. Tammy at head office did all the paper work required. She registered the equipment with the manufacturer, applied for our KW Utilities rebate, the manufactures rebate, and provided us with ,our invoice by email. An excellent performance by the entire Delta Air team. If you require HVAC service or a new HVAC system me and my wife highly recommend Delta Air Systems. We would also like to thank the entire team for their excellent service with this installation and with the service they have provided in the last. And also in the future, our AC unit will be getting its annual service done later this tear by Delta.
Chris L.
20:35 16 Jan 21
Great company, great response time, great service - the motor on our furnace blew on a Weds morning in January, our new furnace was installed by noon on Thursday! I would recommend Delta to anyone looking for HVAC services! The install guys were great as well - literally rolled out the red carpet to keep the house clean while they took away the old furnace and installed the new one - very courteous and professional service!
Dave W.
16:56 13 Jan 21
Had a problem with my furnace yesterday. Burners were not staying lit. I called Delta and spoke with a lady in service who was friendly and helpful. She advised that she had a technician who had just finished a job and she would send him over right away. He arrived lest than 30 minutes later. Guy (that was his name I think) was very friendly and knowledgeable. He knew what was wrong right away. A simple cleaning of the burner sensor. He checked other areas of the furnace and did temperature checks and everything else was great. He was in and out in 30 minutes.Very thankful for the quick response to my needs
Shane G.
14:24 24 Dec 20
Our experience with Delta Air from start to finish was a pleasure. We had immediate action when our furnace began failing. The sales group was extremely reactive and professional and explain in detail the product, installation and future service. The installers Matt and Rob were top notch. They completed the work quickly and took time to explain what they were doing through the process and not just at the end. When the work was completed they explained the operation and did not rush us through it so we knew exactly what we were doing before they left. We did not have to clean up anything as everything was spotless when the work was done. You won't go wrong using Delta Air Systems!!
Heather G
14:00 23 Dec 20
Delta Air Systems provided us with quick, responsive and professional service. We were looking for a solution to heat our backyard studio and Tammy was extremely helpful. She was able to provide a comprehensive quote over the phone and complete a site visit prior to installation. The installation team were very professional and assisted us with setting the system up on wifi after they completed installation. We would highly recommended Delta Air Systems and their incredible team.
Paul S.
00:02 11 Dec 20
My elderly fathers furnace stopped working in his home Friday Dec 4 at 7pm. Fortunately he also has a gas fireplace so he was able to keep warm. I phoned Delta Air Systems the next day( Saturday) and they had a technician out to his home that afternoon. His furnace was very very old and not repairable. They arranged a new furnace install Monday at 8am. The techs Rob and Matt arrived right on time, removed the old furnace, installed the new one same day. When they left you never would of known anyone was there, super clean job!! Great pricing, super fast service! Five out of five guys!! Thanks so very much! Highly recommend Delta Air Services!!
20:59 05 Dec 20
I called Delta after shopping around and having some less-than-stellar experiences with other local installers. I like to do my research and I don't like the hard sell from pushy reps so Delta was exactly what I was looking for. They were friendly and engaging from the word go and I had an immediate sense I had called the right place. Josh came to the house shortly thereafter and we went through our needs in detail so that he could determine the best options for our house. To say that Josh knows his stuff is an understatement and he makes you feel the way you would if you had a buddy who just happened to be an HVAC expert. Friendly, transparent and sincere... qualities that are in short supply in any industry, but especially with contractors. We discussed and debated and when all was said and done the Daikin system he recommended seemed almost too good to be true. We were looking for a fully variable furnace and air conditioner in order to get the best of both comfort and efficiency. The Daikin system was equal to Lennox in every important spec, plus it had a better warranty, better heat exchanger, and a more durable AC design. And with all of the available rebates the value was ridiculously good, with the fully variable system costing only a couple thousand more than the entry-level system. Josh told me to expect the guys to be at the house for two days because they don't like their installers to rush and want everything to be perfect. Tammy was great in the office with the scheduling and the installers were great. Liam and Vince did a fantastic job on the install, which included cleaning up the previous installers' mess and upgrading the ducting on our existing air exchanger. No nickle-and-dime charges for unexpected details, just top-notch work and professionalism. They made sure we understood how everything worked and left the place exactly the way they found it. We had one weird error message on the thermostat a week or two after the installation and they came the next morning to diagnose and fix it - no problem. Otherwise, the furnace has been exactly as advertised - it's ridiculously quiet and runs consistently at a low level rather than full-on, full-off. I feel like this review is going to read like I'm on the payroll or something, but nope, these guys just deserve credit for running a really good business. It also turns out that as I've recommended them to people I know, a few of my friends and co-workers had already used Delta and had the same opinion as me. Good contractors are hard to find and I can't recommend them highly enough.
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A business with a Verified badge has all of their legal and professional requirements vetted by HomeStars — including, most notably, a criminal background check — giving you more peace of mind before inviting Delta Air Systems into your home.

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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