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 →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.
We store your request securely. Marketing updates are optional (CASL).
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.