At Denoco, we’re not only proud of our professional, efficient and affordable range of products and services, our customers back us up!

Take a look at what real Denoco customers are saying about their experience dealing with us…

“After searching for quite a few months for a contractor to install our new furnace, duct work and air conditioning, we chose Denoco. Julie was very professional, patient and always willing to answer any of our questions as we were travelling down the road to making our final decision. When the day came to install all this equipment, the men were there, right on time, were very professional and cleaned up after themselves. We are very impressed by the quality of their workmanship and the quality of the equipment put in our home. We had to call once for a concern and Jamie was there the very next morning, remedied the problem and we continue to enjoy our new equipment. The team is awesome, the service is fast and we couldn’t be happier.”
Tami Y.
One call! One day service. Reliable, good rates. Exceptional staff!
JA. L. Keays
“Denoco provides prompt, professional, and excellent service anytime I have called them. I have had both Manny and Chad over to service my furnace and air conditioner. They are very efficient and are great at problem solving. Mark installed a beautiful gas fireplace for me, I love it! I trust the guys and do not hesitate to leave any one of them at my house when I am not there. They always clean up after they leave. They are for sure on my “who to call” list. Thanks Denoco! “
Sheila A.
“Excellent service and workmanship. Highly recommend”
J. Dybala
“Just can’t stress enough how reliable, efficient and honest Denoco’s employees are.  We often need their services to check furnaces and hot water tanks after floods and other mishaps. Of course they are required most of the time on an urgent basis, and Dennis and company have never let us down.  They have also repaired or replaced a lot of equipment for us and I can be assured that the repairs and installations are done right!!  Their employees are all educated in the field they work in and you can be confident you have hired a professional.  I would recommend them to anyone.” 
Melanie Kerr
Winmar, Lanark County
“Denoco service was excellent..I would recommend Denoco to anybody weather its heating or cooling systems”
J. Hill
“My parents had a man come to their door claiming to be from the gas company. He looked at their furnace and informed them that it had only a few months left. He said he could install a new furnace for them and that they pretty much had no choice. This shocked and scared them. The cost was beyond there budget . They decided to get a second opinion and thank God they did! Along came Dennis to the rescue! He looked at the same furnace and told them some good news! There was nothing wrong with the furnace and probably had many good years left. I have never forgotten that! To know that someone was looking out for my parents’ best interest meant the world to me!! I have used Denoco in my own home, hired them to do all heating and cooling jobs at LAWS where I was in charge of all building maintenance and have highly recommended them to neighbours and friends. Never ever heard a negative word from any of them. Only praise!” — Mel (
Melsfarm (
“Dales Design and Construction has been building houses in the Smiths Falls, Perth and Kemptville area for the past six years and we have almost exclusively used Denoco for the installation of heating systems, air conditioning, fireplaces, air exchangers and hot water heaters (both gas and electric) in the new houses we build. Dennis O’Connor and his staff can provide us with the design for ductwork and the heat loss documentation required by building permits. Required changes to plans and/or after sales service are dealt with in a timely manner and the expertise and work ethic of the staff at Denoco is why we continue our relationship with them as well as recommending them to others.”
T. Dales
Dales Design and Construction, Smiths Falls
“Excellent service through and through, extremely professional office staff and field technicians. The Denoco team really saved us last December when our old furnace quit.
Prompt and reliable, would definitely recommend!”
M. Todd
“Julie was our initial contact…my mother required a new furnace and Julie was very thorough in organizing the Denoco team for an estimate and the required work. These professionals were very thorough in the installation of this new furnace. Julie followed up by completing the furnace inspection documents, Hydro One Rebate, and the warranty paperwork. Denoco can be very proud of the efficiency of their employees! We would gladly recommend their services. Thank you Denoco…Great Teamwork!”
D. Blair
“I dealt with Denoco when ordering an Air Conditioner/Heat pump for my garage workshop. Not only were they very kind, they were extremely speedy when getting exactly what I needed to me. Denoco will definitely continue to have my business in the future.”
“At the end of April, Denoco installed a new heat pump and air handler in my home. I received beyond value from this company and couldn’t be happier with the administrative and service people, quality of the work and outcome. All were so helpful, easy to deal with, and willing to go out of their way to satisfy me, the customer. Julie is EXCELLENT and everything a frontline person should be – friendly, courteous, professional, knowledgeable, respectful, efficient, patient, pleasant, helpful, customer-oriented, plus very skilled and on-the-ball. She worked quickly to get me answers to questions and offered suggestions. Chad is very knowledgeable and spent a great deal of time explaining the equipment and how to use prior to the install and throughout the process. I appreciated Brian’s nose-to-the-grindstone work ethic and the excellent, skillful job he did on the install of a new run and grill. It looks like it was always there. They arrived on time, worked efficiently, removed the old equipment, cleaned up and finished the job early. I wouldn’t have even known they were here. After a day of use, subsequent adjustments to the system were required. They responded quickly to my call and were able to resolve the situation with a few tweeks.”
“Great people running a good business, very knowledgeable and friendly.”
L. DaDrifter
“We are very pleased with the service we received from this company and their staff. The owner arrived on time for the initial appointment and provided a prompt estimate. The men who installed the furnace were extremely tidy and explained all aspects of the unit. Julie was very organized and took care of everything. Easy, fast, stress free process…thank you to Dennis and all the staff.”
C. Kealy

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