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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The Canada Greener Homes Grant through the Government of Canada encourages Canadian homeowners to make energy-efficient changes to their home. If you qualify, you could receive up to $5,600 for the installation of a new heat pump.

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Testimonials & Reviews

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

Delta Air Systems Ltd.
Based on 345 reviews
James F.
11:05 28 Sep 22
Been using them since we moved here. Always do a good job and are very responsive
Dragica T.
16:16 27 Sep 22
I am extremely happywith the service and professional customer support from Delta Air Systems. Tanya from the sales team was very helpful, friendly and the best sales person I have dealt with over the years. Jason and Andrew worked hard to install the new furnace and cleaned up after they were finished. Tammy from the office was very cheerful to talk to on the phone. She registered the equipment for warranty for me which I really appreciate. Overall from start to finish everything was perfect!
John Q.
15:51 15 Sep 22
After we learned our AC was broken we reached out to Delta Air Systems. Tanya responded very quickly to our call and arrived at our home within a few hours. During a period of very warm temperatures we had our install scheduled and completed within the same week. Julian and Brad installed the unit with minimal interruption to our day. The end result was a beautifully installed AC unit and some nice conversations with our installers. I would recommend Delta Air Systems to anyone looking for a reasonably-priced and high-quality AC installed by nice people.
14:00 04 Sep 22
Our experience with Delta air systems was great. The salesman Jason was very informative but not pushy at all. We purchased an a/c unit and furnace. Our installation team Steve and Skylar were very professional! Kept us informed as they worked. Overall a great experience! We are very happy with our a/c unit and furnace.
Brendan G.
20:16 23 Aug 22
Tyler came by and was able to diagnose and fix my AC within an hour. Was very happy with the level of service provided and how they were able to help me get through the warranty process with the part that failed.Would certainly recommend Delta to anyone looking for an HVAC company.
Michal S.
02:02 11 Aug 22
Probably the best customer experience i have ever had!Had Delta Air systems replace an old water heater, replace my old furnace intakes, repair my furnace humidifier, installed a new Ecobee smart thermostat and some little strange request like installing a custom hatch, cleaning the ac coil and hard wiring a booster fan to the furnace. Special thank you to Tyler and Jordan for taking the time to bring my ideas to fruition, you guys Rock!I really appreciate you guys for pulling everything together in such a short time frame. Huge shout out to Julian and Brad for such a clean, professional installation. I’m extremely pleased with the work, would highly recommend Delta Air Systems. Look forward to doing business with you guys in the near future.Cheers!
Tracey P.
12:32 04 Aug 22
Steve, Skylar and Brad did an excellent job installing and explaining the new equipment to us . We are very pleased with the whole process from the consultation visit to the installation
Myrianthi L.
18:17 02 Aug 22
We called Delta Air Systems when our 20 year old AC system stopped working. Tanya came to give us a quote on AC and furnace replacement. Tanya was very knowledgeable and explained the new systems clearly, highlighting their energy benefits and specifications for our home. From the three quotes we got Delta's was the most detailed and Tanya provided us with the longest visit, most thorough inspection and explanation culminating in a choice of 4 systems for varying budgets and needs. Installers, Liam and Matt were punctual, respectful (wore masks ), and their work was very professional. Liam explained the rudiments of the new thermostat and Tanya followed up with a thorough explanation of it. Tanya showed us all the bells and whistles of the thermostat as well as the basic options we would use. We highly recommend Delta Air Systems for their expertise and customer service.
Kate U.
12:53 26 Jul 22
Delta responded promptly to my message and arranged a technician to visit quickly. The technician was professional and friendly and answered all my questions. He diagnosed the problem and had the replacement part on hand so the unit was up and running in no time. I think Delta cares about customers experience.
Tracy Lee C. W.
14:22 25 Jul 22
Delta Air Systems was more than helpful and professional when I had to replace my furnace in (late Dec 2021) and my AC unit (July of 2022). Each installation was done by knowledgeable and polite technicians. Co-ordinating the installs was stress free. The installations were done on time and I am very happy with the work. I am glad that Delta Air was recommended to me via my daughter's friend! Thank you Delta Air.
Gerald A.
14:19 02 Jul 22
Scott and Brad were the installers. They were very professional. They included me in the process and kept asking if I had any questions or concerns. Everything was clean after the job. Overall we are very satisfied.
Graham B.
12:54 27 Jun 22
Started with a diligent review by Tanya of the house needs and whether ductless would work. Good quote and follow up...., installation on time and very well undertaken by Jason and Andrew. They were careful, hardworking, cleaned up everything, but also very good at just talking back and forth about how things were going , how best to do this part etc. The installation was completed ahead of time and the results are excellent. No hesitation in recommending Delta.
Mike B.
20:08 23 Jun 22
Great team with great customer service approach. Julian and Dakota did a great job on the install.
Pamela H
13:01 15 Jun 22
Our A/C wasn't functioning properly so Delta came out to provide service. The technician was helpful and friendly but unfortunately our 17-year-old air conditioning unit was going to require a $700 repair so we opted to replace the unit instead.Tanya was incredibly helpful laying out our options. Originally we were booked 3 weeks out but we were able to move it up to a few days after confirming the unit. Jason & Andrew did the install and were punctual and considerate (put down mats so the floor wouldn't get dirty, they wore masks when inside the house).
Alex S.
17:44 13 Jun 22
The Delta team just finished installing my new furnace/AC and some new ductwork and I am thoroughly impressed with how clean and precise their work is. All of the lines, cables, ducts, etc. have been run neatly and some of my stuff was even relocated as part of the job (which they didn't have to do!). It was a pleasure dealing with them on all fronts, and our new system has been performing beautifully. I was worried about some of the challenges and complications that come with an older home like mine but they knew what they were doing. Highly recommend!
Star C.
22:34 08 Jun 22
Another 5 star repeat performance last week by Zach at Delta Air Systems. Third year in a row. Thanks again for the professionalism, integrity and great advice.*******Last Year's Review Below*******Zach just serviced the ACs at both our house and our condo. He was excellent. Patiently answered all of my layman's questions and provided a lot of additional valuable information important to our HVAC systems. As I had written in last year's review, Zach was again personable, knowledgeable, competent and very honest. Thanks again Zach and Delta Air Systems!
Brad B.
23:44 07 Jun 22
Very helpful!And know there stuff
gary H.
17:09 27 May 22
Very happy with the service to repair my air conditioner.
Yaqiong Y.
13:15 24 May 22
Very happy with their service. The price is fair and the service is excellent and fast.I
Stephen B.
19:33 09 May 22
Excellent service on install - my furnace closet was a bit of a DIY mess (stuff running all over the place, weird foam sealing, dirty condensation pump) and when Delta installed the AC they cleaned it all up, gave me a new pump for free, and everything now looks high quality and professional.A year later the maker of the AC issued a recall on the drain pan of the unit I bought. Delta retrofitted it as soon as the part arrived, no questions asked and no charge! Turns out Daikin had arranged for another repair company to fix it - didn't realize that. However I'm glad Delta did the retrofit as it was a quality job as usual (and they know they're own installs best I'm sure too.)
Mauricio V.
03:27 03 May 22
For the short period I have been dealing with this company, I am happy for their service. The technicians and office staff are amazing, friendly and helpful.
David A.
14:05 19 Apr 22
We inherited a furnace from the previous home owners - last night it started giving us trouble. Called the Delta Air non-emergency line and they called back first thing this morning, dispatching a technician in less than 20 minutes. The pressure switch was having trouble and since the furnace was still under warranty (we didn't know) Delta replaced it with no parts cost. Overall very impressed with quality of service and responsiveness - glad our furnace got fixed on the last cold day of the winter!
Shannon Y.
12:56 02 Apr 22
The service tech Zachary was very professional, knowledgeable, and friendly! Also when called in, they were able to get me an appointment right away, very pleasant experience!
John G.
11:12 18 Mar 22
The experience we had from the start with sales rep (Jason) to the installer team (Jason and Andrew) was exceptional. Not only did we get an excellent new system of Lennox AC and Furnace other improvements were made to our setup including venting for a poorly installed water heater. Very pleased and highly recommend.
Shahid K.
20:34 11 Mar 22
I had a great experience with Delta Air Systems. They installed a new furnace for me. Jayson, the sales person was very friendly and knowledgeable. The installation crew, Steve and Kyle, showed up first thing in the morning and were incredibly courteous and professional. The installation was great and they left the furnace room and my basement clean.
Darlene J.
19:42 10 Feb 22
Delta was recommended to me years ago and they installed all my current equipment back then. I can happily say they are worth their weight in gold. Needed some servicing this winter and I can confidently say they haven't changed. Still the best after all these years.
Glenna K.
19:45 26 Jan 22
Great service - I was very pleased with everyone involved in the attempted repair of my old furnace(Tyler), sale of new one (Jason) and installation of the new unit (Julian and Ben). All were prompt and very respectful - even bringing a heater to help us keep warm. All in all, a really good experience.
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.
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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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