• A young boy drives a toy Denoco Truck


At Denoco, we offer full furnace installation, repair and maintenance services.



We offer central air conditioning, ductless air conditioning and roof-top units.



Everything from basements and new additions to bathrooms and kitchens.


Denoco Energy Systems

Ottawa’s Best Location for All Your Heating and Air Conditioning Needs

Maybe you know us as Denoco Heating and Air Conditioning or Denoco Plumbing and Heating. It doesn’t matter, we are Denoco and we are here to keep our customers satisfied.

In fact, we guarantee your satisfaction. We have gained a lot of expertise over the last 30 years and we know you will benefit from that. Whether it’s a plumbing service call for your kitchen sink or the heating and air conditioning installation for you new custom home or business, we expect that you will be as proud of our work as we are.

Our tradesmen are professional, polite and competent. As often as possible they attend manufacturers service classes in order to upgrade their skills and learn new techniques. Also, and we think this is important, your house will be as clean when we leave as it was when we arrived.

So, for any of your service or installation requirements, for plumbing, air conditioning, heating, solar, geothermal etc, give us a call. We won’t let you down.

Get a free quote!

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Our Customers Back us Up!

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

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
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
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.