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 251 reviews
Scott K.
13:42 23 Nov 20
Called where they may have been a little late. Technician was knowledgeable and friendly. Looking at getting humidifier system for home.
17:15 15 Nov 20
Had our 5-1/2 York high-efficiency furnace stop working recently. Looked for reputable, well-reviewed heating-cooling companies in Waterloo and found Delta. They came out next day and inspected furnace to find that the main blower motor had failed. Technician was informative, great to deal with, and explained everything about the parts coverage (100% warranty from York) and the service fees. Even got a call from Kelvin, the Delta Service Manager reviewing the work needed. Following day, new part ordered and replaced, different tech but also friendly and happy to explain things, furnace now working like brand new. Highly recommended, personal service, great team, great value for money. Thanks Delta!!!
Stacey P.
14:33 28 Oct 20
We decided to replace our 17 year old furnace, due to the fact it was broke and what we didn't realize is that it was undersized for the size of our home. Josh the sales guy was easy to deal with, no pressure as to purchasing a furnace with Delta, the fact he recommended getting other quotes shocked us. Who does that, a company who believes in what they do and is competitive in pricing. We decided to purchase from Delta and couldn't be more happy. Josh ordered the furnace and with in 72 hours the installers were at our door with a new furnace. Our installation crew was Scott & Liam who did a fabulous job , to putting down drop clothes, and respecting we have dogs so not leaving doors open and when they did require the door open they let me know ahead of time. The work they did was neat, tidy and done in a timely manor. They went over the new thermostat with us to ensure we understand how to use it. I strongly recommend Delta as a first choice for furnace, fire place cleaning and AC units. Thank you Delta, Family owned business in KW for our new Furnace
Rajagopal R
22:41 17 Oct 20
Excellent service starting from sales to maintenance service. All all the staffs are very professional and experienced. Tanya H did a excellent job by explaining all the models and their functions. Also she was able to compare other brands as well. Tammy also very responsive for all my queries. Overall I had positive experience with Delta Air Systems. I definitely recommend Delta with my friends. Thank you everyone !!
M. Fatih Y.
03:00 01 Sep 20
Very professional from getting a quote to having your system being installed. Would recommend to anyone who is planning to have HVAC repaired or replaced.
Jordan V.
14:47 29 Aug 20
From the minute you call them you can tell they’re absolute professionals. Josh took great care of us and made sure we were getting the right solution for our 100 year old home. We ended up going with a 4 head ductless system, which has been amazing so far. Very quiet and has no issue cooling our two story home. Scott and Kyle installed our system and we can’t say enough about the great job they did. The work was done to a very high standard. Probably some of the best overall service I’ve experienced from a business in a long time. Thanks again guys!
Bethany&Greg M.
22:07 18 Aug 20
It was a very, very good experience. I totally get why there are so many 5 star ratings! We had our very old air conditioning unit replaced by Delta after service technician Megan quickly and accurately diagnosed our problem and recommended a new unit. Our salesperson Josh was thorough, inspecting our system and advising what Delta would do on installation including improvements to our duct work. On the installation day, Steve and Julian arrived on time, were very professional, tidy and efficient. They did a great job on the installation. They did everything Josh said would be done and we had cool air again in no time. Delta is very good at customer relations. They return calls, arrive on time and ensure that everything is to your satisfaction. I will not hesitate to call them again. Thanks Delta Air Systems team!
Michael W.
14:31 14 Aug 20
Technically knowledgable. Best pricing. Quality installers.
Helmann W.
18:32 07 Aug 20
Probably the best customer service I’ve experienced in a while. Unlike other companies that tried pressuring me into rental furnaces – or was vague in their offer/charges - Delta Air actually explained their prices and products in detail. That being said, John from Delta Air stayed in touch throughout the whole process and always took the time to answer any questions or concerns I might have had. As for the installation itself, Jason and Andrew were very considerate and professional, while Tammy was incredibly helpful with the warranty/rebates. Cannot recommend this company enough. Thanks again for everything!
15:07 29 Jul 20
We recently had an air conditioner installed in the middle of a heat wave. We were certain that we'd be waiting a month for it to be finished. Josh, Tammy, Liam, and Steve all worked quickly and professionally to get it done fast! Great team. Can't ask for more.
Faye H.
20:19 28 Jul 20
Our AC unit decided to break during a very hot July on a Saturday eve. We called Delta air systems and booked an appt for Sunday. Guy was the repairman who came when he promised and recommended that we needed a new unit. He called the sales dept to set up an appt. Everyone worked with us to quickly get a new unit installed even though it was prime AC season during a pandemic year. Tanya was very knowledgeable and helped us pick the correct unit for us. Scott and Liam who came to install it came at the time promised and were very professional in their work. We would certainly recommend this company again.
chris B.
17:41 27 Jul 20
One day, and done! Dave(?) and team fast, courteous, Scott explained the options, needed some piping redone, as it was no longer in code, they did it quickly, cleaned up after themselves. No problems at all. Great job guys!, Update from original review: Just had the annual inspection, fast courteous, same good service. Update. Just had new air conditioner installed. Steve and Justin worked on it, and I barely knew they were there. Great job (again).
Keith F.
15:23 21 Jul 20
Quite happy with the whole deal. The sales rep was excellent and he actually listened to what I wanted and made it happen. The two installers, Liam and Mike were polite and professional. They stayed till the job was done and cleaned up well. Back office help also was top notch. I've dealt with Aire One and Reliance and won't have them back. Delta got the job done on time as promised.
Terry M.
15:19 21 Jul 20
The service is great and the staff knows what they are doing. Their service person Guy did an outstanding job making sure everything was working properly and it was safe. I would recommend this company.
Daniel M.
15:01 14 Jul 20
A sincere thanks to the Delta team, I am very satisfied with the new Lennox furnace and the installation. My furnace room is a very small space, and presented a tough challenge.But Delta re-assured me that they could do the job, and do it well and to code. They definitely did succeed. They had to move the water heater to do this, but now its a much better install than before and I have a new reliable Lennox furnace to provide comfort for many years.A special mention to the installers Steve and Julian, who were very professional, and did a great job on a very hot July day. Also thanks to Josh (sales), who was very knowledgeable and presented all the options and pricing, and answered all my questions. And thanks to Kevin (install manager) who checked in on install day, and toTammy (office) who registered the furnace and processed the Lennox rebate.In summary, when purchasing a new Furnace and/or AC, you want to get quality and reliability not just from the equipment, but also from the company that is doing the installation.Thanks,Dan M.
Jani C.
02:21 05 Jul 20
We had Delta install a new hot water heating system and ductless air conditioning system last November and we have now had time to evaluate them. It was cold but the crews were great - clean, neat and diligent.The heating system works a treat and we are very happy. We are now in a hot spell and the air conditioner (Daikin) with two indoor heads is doing the job perfectly. Only "complaint" is that it can be a little cold at 21 C inside while it's 33 C outside. We are learning about all the ways we can set up the indoor units to fix that. Nice problem to have. Very quiet indeed and the outside unit is stunningly quiet, too. Neighbors are impressed! Thanks to the AC guys for a great job under trying November circumstances, Yep, we'd do it again. Thanks Delta.
Natasha P.
22:11 04 Jul 20
We recently hired Delta to replace our furnace and install an air conditioner (at the same time). The technicians were extremely professional and did their work with care. This work happened during COVID and they were very respectful and cautious. They showed up wearing masks (before this was required).We were a bit nervous of damage to our hardwood floors throughout the house as they had to bring large equipment through the house. But they put down mats and we didn’t find a scratch or dent when they were done.Communication was excellent throughout the process and the invoice was exactly as it was quoted.We had an issue after installation (the fan was not working properly). We reported it and a technician came in and resolved the issue promptly at no extra charge. I wouldn’t hesitate to hire them again.
Sook B.
19:40 02 Jul 20
Delta Air Systems dedication to customer service was of the highest caliber of professionalism. Vince and Dakota did a great job answering all of my questions, while delivering quality work at an attentive, safe, and considerate pace. I've really appreciated the hard work being done at Delta Air and feel safe knowing they installed my A/C.
Jason Q.
16:20 01 Jul 20
Hi I contacted you a couple of weeks ago about the amazing service I received from Josh>> Well I would like to let you know that your boys came through again.   I had my install done today from Steve.  Once again, amazing person with unlimited knowledge, and really knows how to talk to clients. Felt like I knew him for years.   His helper was Mike.  Mike was a really nice guy to talk to also>> Right from the start with Josh to the install with Steve and Mike,  it made my decision super easy that no other HVAC company is EVER welcome in my house EVER again>> Oh not to mention the energy and positivity from talking with Tammy.  She seems like a great person aswell.>> Just 4 people I dealt with from Delta, amazing experience.   You should be proud of your employees>> Keep up the great work>>> Thanks> JasonThis was a direct email that I sent to the owner. The owner was very pleased to hear these comments
Ann G.
14:57 27 Jun 20
My experience with Delta Air was a positive one from the very beginning with the introduction to Tanya as she came into our home to evaluate our needs. When our air and furnace was being installed by Liam and Tyler, I was impressed by their professionalism and their respect for our home. The job was A-1. Tammy in the office was friendly and helpful. I was very pleased the the whole experience.
21:28 26 Jun 20
Thanks Tanya Hindle for being patient with me in answering all my questions so promptly , it seems you work 24/7.And thanks to the installation crew was Steve & Julian for the Professionalism / Workmanship, made my day.
Tia D.
18:36 26 Jun 20
This spring our 10 year old A/C unit stopped working unexpectedly. We called Delta and they diagnosed it quickly and advised us on next steps right away.We ended up replacing the unit and they were incredibly helpful through the process. Tanya, the sales rep was very professional and the installers, Vince and Dakota were both fantastic. My husband and I were working from home at the time of install and they were incredibly courteous and patient. They cleaned up very well before they left and even went above and beyond by replacing our very finicky drop ceiling tiles for us.Couldn’t say enough good things about the service!
13:11 25 Jun 20
Working in a trade directly with the customers for many years repeat business and referrals are very important. I connected Delta air systems to quote replacement of a central air unit after a co-worker gave me a referral. I was extremely pleased with the service. Steve and Julian where on time , completed the work in the time frame quoted, work was professionally performed and tested .Steve was pleased to show me what he and Julian had done. Explained how to take care of the new air conditioner. Took his time to answered my question before leaving.Josh at Delta air systems was the name my co-worker gave me , give him a call.Dave C
Julie Kate S.
22:01 22 Jun 20
Delta's customer care is excellent not only because their people are knowledgeable but also because they offer free after-service advice and support. They will check in to see that everything is working, that the heating and cooling systems are balanced, that vents are adjusted properly, and that you know how to programme the thermostat and so on. Josh (sales), Tammy (admin), Rob and Matt (installation) are friendly, happy, professional and courteous. They will go out of their way to help you. They were very busy but made sure because we were repeat customers (they also installed our new furnace) that we were a priority in their schedule.
David G.
13:06 19 Jun 20
The rep (Tanya) came out and helped educate us on what our house needed, not what was for sale. She took the time to measure, explain everything, and give us options! Really appreciated it! Jason and Liam did an amazing job installing our new AC! Thanks everyone!
Gord H.
01:01 19 Jun 20
How pleased I am with Delta started before I had problems with my AC ... as a field tech for a telecommunications company myself I went to an employees home (Steve) to install internet. He treated me with so much respect. Because of Steve, Delta was the first company I thought of when our trouble started. The first tech Guy was awesome, but regrettably it was time for a new unit. John from sales was an excellent visit and he knew exactly what we needed. Day came for the install. Vince and Tyler showed up early ... fun guys. They gave us gold plated service. John even popped by to see how it was going. The ladies we dealt with on phone were a class act as well. Basically, A++ all the way! Thanks to everyone.
Star C.
19:42 16 Jun 20
Zach just serviced our AC and Air Handler. He was excellent. Personable, knowledgeable and competent.
Sher B
00:08 12 Jun 20
Excellent experience dealing with Delta Air on the install of my ductless a/c system. John’s knowledge and honesty helped me to make the right decision. Technicians Scott and Liam worked so hard on one of the hottest days without any complaints; explained everything and left leaving no mess. Thank you!
Yuri G.
20:56 10 Jun 20
Excellent work by the technician (did not catch the name). She did the scheduled maintenance and spent quite some time outside working with our unit. AC is working perfectly now: much more efficient and very quiet. Thank you!
Justine S.
15:29 09 Jun 20
Excellent work and very professional while in the midst of a pandemic.
Kerr B.
21:53 02 Jun 20
We just had our Furnace, A/C, Thermostat, Air Filtration system and Humidifier installed at our home and we were very pleased right from the moment we had our initial visit from Tanya to suggest and explain the right system for our needs and send us a detailed and fair quote, to the time the installers, Steve and Julian, left our home having done an extremely efficient and professional installation. They were punctual, respectful, professional and did a neat and clean install. I highly recommend this company and hope to have a long and happy relationship with themTHANK YOUShehnaz and Kerr Banduk
Mary Z.
01:31 23 May 20
Amazing service. Annie went above and beyond to help replace my water heater under a Home Depot warranty.
Christine M.
19:23 15 May 20
I was very impressed with my AC start up today. My technician Zach was very pleasant and helpful. Great service from everyone that I dealt with at Delta. I will use Delta Air Systems again in future.
15:21 03 May 20
Our old furnace broke so we called Delta and Josh came right away. Even with all the covid19 stuff going on he was super professional and safety was priority. We chose our furnace/a.c unit and the techs were here the next day installing both. So happy we chose Delta as we could not be happier how everything worked out! Highly recommend Delta if you are in need.
Brian B.
20:02 20 Apr 20
Absolute first rate service by Delta Air in responding to my call for service on our condo unit’s fan coil heating & cooling unit. Sent an email Sunday evening and received a prompt and pleasant call from their Dispatcher early Monday morning offering me a 2 hour window in either morning or afternoon. I chose 10:30 to 12:30 and Technician called 15 minutes in advance of his arrival. He was very pleasant and listened attentively to the issues and then commenced his investigation. He made a change in the wiring to the fan blower and suggested I make a modification to my smart thermostat setting. The noise from the blower is now much less and the fan doesn’t run until it is needed. A very reasonable one hour service charge which I was pleased to pay immediately by credit card. He advised me to call if there were any further issues as he said they want a satisfied customer. I was very, very pleased with their immediate response and diagnosis and adjustment. One of our condo neighbours advised that she was treated exceptionally well by Delta Air in a winter, after hours emergency. I highly recommend Delta Air.
Slobodan S.
22:37 02 Apr 20
Zach F from Delta Air Systems was amazing! He went above and beyond. I had a bird stuck in my vent that leads from the furnace to the outside of my house. This was causing the furnace not to work. Zach went above and beyond his job to snake the bird out of the ventilation pipes. I would recommend Delta and Zach anyday to anyone!
Mariko O.
23:49 14 Mar 20
The first thing that impressed us most was your team was at our doorsteps right on time. That first impression was never diminished throughout the day, and finished early. They were efficient, and yet answered all our questions with courtesy and never dismissive. Good for you. We hope the system works as good as the people who installed it.So far, just 3 days, we were quite satisfied with its quietness, settings, and the look.Josh, Vince and Dakota are all excellent representatives of the company and Delta System.Morio & Mariko
14:37 28 Feb 20
Extremely, extremely happy with the services I've used from Delta this year. We had them in a couple months ago to install a humidifier, and then a separate appointment to inspect our furnace since we haven't done that since taking possession of our home a couple years ago.The day didn't start off the best - the Delta installers came and had concerns about how the air return piping was done by the company the old owner used to install the furnace. The piping would not be compatible with the spacing needed to install the humidifier they were there to install because the installers had taken some shortcuts to save time and materials (as the Delta guys explained to me when showing me what was done). From the other room while working, I could hear them talking among themselves on how the only way to install this humidifier is the right way, and that there simply were no other options they could take to get it to work with how the weird pipe was in our house. A couple phone calls later after I asked for a quote to fix the unusual air return, and it was taken care of with no cost to me I was told. They went back to the shop, bent a proper pipe, replaced my old one, and went on with the install! The installers were TOP NOTCH this whole time. Always keeping me well informed as to the problems, and pointing out and explaining how things were, how they should have been, and why that was causing problems. I was most impressed to overhear that they weren't going to accept any way other than the proper way of doing things! What got us into this mess in the first place was that the last company who did work before I owned the house did NOT do the proper way, they did the fast and cheap way.All Delta staff we interacted with that day, from the installers to the inspector later in the day, were top notch. Very friendly and transparent, and the type of people I want to do business with. We will use them again and happily recommend them to everyone.
14:37 09 Feb 20
I am very pleased with the service that I received from the team at Delta Air System Ltd, when I had to replace my furnace. Vince and Kelvin where very supportive, and their team provided prompt, punctual and courteous service support. Thanks Josh for the informative quote package and Dakota and Jason for the exceptional job in installing and getting my new Lennox furnace running, in less than 24 hrs. This furnace is a dream, I do not even hear the system running, it's fabulous. Thanks A.J.
Valerie C.
02:00 01 Feb 20
Very happy with my decision to use Delta Air Systems when I had to replace my furnace. From the young technician, who arrived early. Then, Tanya H.who was there through the whole process and answered all my questions. Jason and Mike the installation crew were wonderful. Both demonstrated a great pride in their workmanship. Everything was neatly finished off and no loose ends anywhere. They went above and beyond to make sure I was a very happy customer.A very good experience. Would not hesitate to recommend Delta Air Systems.
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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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