HVAC
Heating, cooling, heat pumps, ductwork, air quality, and light commercial HVAC, sized for real loads and real Ontario weather.
- Heating
- Cooling
- Heat pumps
- Ductwork
- Air quality
- Light commercial HVAC
Second-generation family business
Premium HVAC, plumbing, and home energy, built for Ontario winters.
Two coordinated branches in Smiths Falls and Kingston. Heat pumps, furnaces, plumbing, solar and net-zero planning, with the right diagnosis, the right sizing, and a crew that finishes clean.
No heat, no cool, or a major leak? Call your branch for a faster response.
- Licensed: TSSA + ECRA/ESA
- Daikin equipment partner
- Built for Ontario winters
- Solar, storage and net-zero
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45 yearsSecond-generation family business
Two branchesSmiths Falls + Kingston
Daikin partnerCold-climate heat pumps
4.6 / 5Rated by customers
What we do
One team for the whole home energy system.
Most homes do not need more equipment. They need the right diagnosis, the right sizing, and a crew that finishes clean. Browse what we do, or tell us what is going on and we will route you to the right branch.
Plumbing
Repairs, water heaters, treatment, drains, and fixtures, diagnosed properly and fixed clean.
- Repairs
- Water heaters
- Water treatment
- Drains
- Fixtures
Solar & Energy
Solar, batteries, generators, assessments, and net-zero planning, built around honest payback and reliability.
- Solar
- Batteries
- Generators
- Energy assessments
- Net-zero planning
Additional Services
Maintenance memberships, WETT, chimney, fireplaces, and specialty issues, Kingston-focused where noted.
- Maintenance memberships
- WETT inspections
- Chimneys
- Fireplaces
- Radon (Kingston)
Our work
Real installs, finished clean.
Furnaces and heat pumps, plumbing and water treatment, solar and radiant heat. A look at the kind of work we stand behind, photographed on the job.
Solar & energy
Lower bills and lower carbon, planned in the right order.
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 is not that heat pumps do not work. It is poor sizing, ignored duct limits, or a bad backup heat plan. We show you the trade-offs, hybrid versus all-electric, what upgrades are actually required, and what is optional.
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 will tell you when net-zero is a bad fit for your home right now.
DaikinEquipment partner
About Denoco
This community built Denoco.
Forty-five years of referrals, return calls, and neighbours telling neighbours, that is what kept us going and what keeps us showing up at our best. We are a second-generation team that takes that trust seriously.
Today we are carrying that foundation into the future: smarter energy systems, greener homes, and a level of service that is harder to find every year. If you want a company that has been here, plans to stay here, and treats your home the way we would treat our own, you are in the right place.
- Right diagnosis, right sizing
- Written recommendations
- Local crews
- Licensed work and permits
“A very trusted company and always does an excellent job.”
45Years serving Eastern OntarioSmiths Falls + Kingston
Locations
Two coordinated branches, one Denoco.
Denoco routes service by postal code and service type. If your postal prefix is shared between branches, we ask one quick question and route you correctly. We do not guess.
Head office
Smiths Falls
- 2 Victoria AveSmiths Falls, ON K7A 2P1Directions
- (613) 283-0574
- info@denoco.com
Winter HVAC emergency coverage
TSSA FS R0076487578
Core HVAC, plumbing, solar and energy, and generators.
Branch
Kingston
- 23 Glenwood CrtKingston, ON K7M 7G1Directions
- 613-777-5475
- info-king@denoco.com
Year-round emergency coverage, all services
TSSA FS-R-53391
Everything Smiths Falls offers, plus Kingston specialties: radon, WETT and wood energy, chimneys and fireplaces.
Reviews
Trusted across Eastern Ontario.
In their own words, from homes and businesses across the region.
“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 could not be done right away, they drove out, took a look, and said they would be back as soon as they had the right parts. Unlike other companies, they did not 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 were not left to freeze. They fixed the problem first time around. And they do not 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.”
How it works
From the first call to a clean finish.
The right diagnosis, a straight quote, and work done properly. No guessing, no upsell.
- 01
Tell us what is going on
Send your postal code and a few details, or call your branch. We route you to Smiths Falls or Kingston by area and service type, no guessing.
- 02
The right diagnosis and a clear scope
We diagnose properly and size for your home’s real loads, then give you a written recommendation and a straightforward quote. Permits where required in Ontario.
- 03
Installed and finished clean
Local crews do the work, take care of your home, and leave the space clean. The kind of service that is harder to find every year.
FAQ
Common questions, straight answers.
Still curious? Call (613) 283-0574 and ask. We will take it from there.
Which Denoco branch should I call?
Denoco routes service by postal code and service type. Smiths Falls handles core HVAC, plumbing, solar and energy, and generators. Kingston handles those plus Kingston specialties like radon, WETT and wood energy, chimneys and fireplaces. If your postal prefix is shared, we ask one quick question and route you correctly.Do heat pumps work in Eastern Ontario winters?
Yes, when the system is designed for cold-climate performance and sized for your home’s real heat loss rather than brochure numbers. The usual problems are poor sizing, ignored duct limits, or a weak backup heat plan. We show you the trade-offs, hybrid versus all-electric, and what upgrades are actually required.Do you offer emergency service?
Kingston provides year-round emergency coverage across all services. Smiths Falls provides winter HVAC emergency coverage. No heat, no cool, or a major leak? Call your branch at (613) 283-0574 or 613-777-5475 and you may get a faster response.When are you open?
Office hours are Monday to Friday, 8:00 a.m. to 3:30 p.m. For emergencies outside those hours, call your branch directly.Are you licensed?
Yes. Denoco is a licensed contractor with TSSA Fuel Safety Registration (Smiths Falls FS R0076487578, Kingston FS-R-53391) and ECRA/ESA Electrical Contractor Registration 139417. Always hire licensed contractors for gas and electrical work in Ontario.How do I get a quote?
Tell us what is happening and your postal code through the form, or call your branch. We confirm the details, route you to the right branch, and give you a clear next step: an on-site assessment, a service call, or a straightforward quote.
Contact
Tell us what is going on.
Send a few details and your postal code, and we will route you to the right branch and give you a clear next step. Or call your branch directly.
Get in touch
- Call your branch
- Emailinfo@denoco.com
- Office hoursMonday to Friday, 8:00 a.m. to 3:30 p.m.
- EmergencyEmergency service by branch: Kingston year-round (all services); Smiths Falls winter HVAC only. Call your branch.
Request a quote
No heat, no cool, or a major leak?
Call your branch and you may get a faster response.