Eastern Ontario (Smiths Falls HQ + Kingston)
Premium HVAC, plumbing & home energy — built to perform in Ontario winters
This community built Denoco. Forty-five years of referrals, return calls, and neighbours telling neighbours — that's what kept us going and what keeps us showing up at our best. We're a second-generation team that takes that trust seriously. Today, we're carrying that same foundation into the future: smarter energy systems, greener homes, and a level of service that's harder to find every year. If you want a company that's been here, plans to stay here, and treats your home the way we'd treat our own — you're in the right place.
- Two coordinated branches (Smiths Falls + Kingston)
- Emergency service: Kingston year-round (all services); Smiths Falls winter HVAC only
- Clear scopes + written recommendations
- Licenced work and permits where required (Ontario)
No heat, no cool or a major leak? Feel free to call, you may get a faster response time
What can we help you with?
Most homes don't need “more equipment.” They need the right diagnosis, the right sizing, and a crew that finishes clean. Browse services or tell us what's going on and we'll route you to the right branch.
- HVAC
Heating, cooling, heat pumps, ductwork, air quality, and light commercial HVAC — sized for real loads and real Ontario weather.
See services → - Plumbing
Repairs, water heaters, treatment, drains, and fixtures — diagnosed properly and fixed clean.
See services → - Solar & Energy
Solar, batteries, generators, assessments, and net-zero planning — built around honest payback and reliability.
See services → - Additional Services
Maintenance memberships, WETT, chimney, fireplaces, and specialty issues — Kingston-focused where noted.
See services →
Which Denoco branch should I call?
Denoco routes service by postal code and service type. Smiths Falls handles core HVAC, plumbing, solar/energy, and generators. Kingston handles those plus Kingston-only specialties like radon, WETT/wood-energy, chimneys and fireplaces, and more. If your postal prefix is shared, we'll ask one quick question and route you correctly — we don't guess.
Find your branch →Do heat pumps work in Eastern Ontario winters?
Yes — if the system is designed for cold-climate performance and sized for your home’s real heat loss, not brochure numbers. The common failure isn't “heat pumps don't work,” it's poor sizing, ignored duct limits, or a bad backup heat plan. We'll show you the trade-offs (hybrid vs. all-electric), what upgrades are actually required, and what's optional.
Heat pumps →
Net-zero ready, without the hype
If you want to move toward lower bills and lower carbon, the order matters: envelope, airflow, electrical capacity, then equipment. We help you build a plan that makes sense even if incentives change — and we'll tell you when “net-zero” is a bad fit for your home right now.
Net-zero planning →What customers say
104 Google reviews · avg 4.6 / 5
- ★★★★★
“Early this year Dennis helped us select a Daikin Air Sourced Heat Pump for our home on Sharbot Lake. His sizing and recommendations were spot on. From sizing through installation the experience was excellent. The A/C was really top notch during the summer — many guests called it a game changer. There was a noticeable difference in our electricity bill vs our old window A/C solution. Denoco Energy did a great job in helping with government rebates. The comfort level payback is immediate.”
- ★★★★★
“I went with another company first — bad mistake. The minute I called Denoco they were fast to respond. Even though the fix couldn't be done right away, they drove out, took a look, and said they'd be back as soon as they had the right parts. Unlike other companies, they didn't leave us stranded with no heat in the middle of winter — they left us not one but three of their own heaters to make sure we weren't left to freeze. They fixed the problem first time around. And they don't charge an arm and a leg to help you out.”
- ★★★★★
“We have used Denoco on two occasions now. They installed a new air conditioner about 5 years ago and most recently installed a new furnace after our 20+ year old furnace kicked the bucket. Super professional, kept the space clean, and the office staff (Julie) was very kind and easy to talk to. We highly recommend Denoco!”
- ★★★★★
“Denoco Smiths Falls is a very trusted company and always does an excellent job with our furnaces. Office staff and technicians are wonderful to work with.”
- ★★★★★
“Great and fast service, professional and courteous staff. Brian and Valan have gone above my expectations of what a business should represent. Excellent communication and fixed right the first time without any issues. Would highly recommend Denoco to anyone.”
More reviews
Get a quote
Tell us what's happening and your postal code. We'll route you to the right branch, confirm details, and then give you a clear next step — whether that's an on-site assessment, a service call, or a straightforward quote. Only K0E / K0H need a quick community choice — everywhere else we assign the branch automatically.
Emergency HVAC or plumbing? Call your branch: (613) 283-0574 / 613-777-5475.
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Find your branch
Enter your postal code (e.g. K7A 1A1). We route by the first three characters (FSA). Unsure? Call either branch — we will steer you right.