High-Quality HVAC Contractor in St. Catharines
If you're seeking repairs on an old furnace or you want to purchase a new air conditioning unit, call J & S Heating And Air Conditioning for all types of heating, cooling and HVAC contractor in St. Catharines and the Niagara Region. In a professional and timely manner, we install, repair and perform routine maintenance on all heating and cooling systems and refrigeration appliances such as furnaces, boilers and walk-in coolers.
Contact us to book your service today!

Your Comfort Professional in the Niagara Region
J & S Heating And Air Conditioning was formed in 1956 by Mr. Gord Jenkins and Erzel Snetzinger. It was a small company with only three trucks and three servicemen to serve the St. Catharines area. J & S Heating And Air Conditioning primarily looked after commercial refrigeration, heating and cooling and farm cold storage needs.
We Expanded to Serve Your Residential Heating and Cooling Needs
As technology changed and modern times approached, J & S Heating And Air Conditioning changed as well. In 1974, new ownership saw J&S expand to serve the Niagara region. We also expanded our services to include residential heating and cooling and changed our name to J & S Heating And Air Conditioning.
Service Is Still a Top Priority for J & S Heating And Air Conditioning
J & S Heating And Air Conditioning was founded during a time when serving the customer was the top priority. Sixty years later, that tradition continues. J & S Heating And Air Conditioning continues to serve the Niagara region as an authorized Carrier® dealer, providing sales, service and maintenance to both residential and commercial customers. We strive to exceed your needs and expectations on every job. You won’t be disappointed.
Practical Heating and Cooling Services for Year-round Comfort
Maintaining a comfortable indoor environment throughout St. Catharines' varying seasons requires HVAC systems that are correctly sized, properly installed, and regularly maintained. At J & S Heating And Air Conditioning, we strive to deliver services that support system longevity, energy efficiency, and safe operation for both residential and commercial properties.
Our team conducts detailed assessments before recommending any equipment or service work. This allows us to account for building layout, ventilation requirements, insulation levels, and load calculations. Whether you need assistance with furnace installation before winter or air conditioning repairs during peak summer temperatures, our technicians are equipped to carry out the work in accordance with Ontario building codes and TSSA safety guidelines.
We also offer scheduled maintenance programs to reduce the risk of system breakdowns and preserve equipment efficiency over time. These programs include seasonal tune-ups, filter replacement, electrical system inspections, and more, helping you plan ahead and manage heating and cooling costs effectively.
Residential & Commercial Maintenance
Both residents and local businesses in the Niagara Region can benefit from routine maintenance from J & S Heating And Air Conditioning. Routine maintenance is important to catch problems early, avoid frozen pipes in the winter or prevent overly humid homes in the summer. We offer yearly visits for residents and contract maintenance for businesses. This maintenance covers various appliances, including electronic air cleaners and hot water heaters for residents and ice machines and radiant tubes for commercial businesses.

Comprehensive HVAC Services
J & S Heating And Air Conditioning delivers a full range of HVAC services tailored to the climate conditions of Southern Ontario. Whether the requirement is to install a new furnace before the winter season or conduct a seasonal tune-up for an air conditioner, the company follows structured procedures and adheres to the Ontario Building Code and CSA standards.
Our comprehensive services include:
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Furnace installation and repair
Installation services account for sizing, ventilation, and energy efficiency ratings. Repair services focus on diagnostics and component-level restoration.
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Air conditioning system services
The company handles central air conditioning and ductless split system setups. Service calls typically include refrigerant checks, filter replacement, and coil cleaning.
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HVAC system maintenance
Routine inspections are scheduled to ensure that heating and cooling systems operate at their designed efficiency levels, helping prevent unexpected system failure.
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Emergency repair availability
Technicians are dispatched during off-hours in case of sudden equipment breakdown, ensuring minimal disruption to indoor comfort.
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Indoor air quality services
Additional services include installation of humidifiers, HEPA filtration systems, and UV light purifiers to support healthier indoor environments.
Compliance, Safety, and Licensing
All HVAC services are delivered in accordance with provincial regulations. J & S Heating And Air Conditioning employs licensed gas fitters and HVAC technicians certified under the Technical Standards and Safety Authority (TSSA). This ensures that all equipment installations and service procedures comply with safety laws and operational standards.
Moreover, the company maintains liability insurance and adheres to workplace safety practices as outlined by the Ontario Ministry of Labour. Technicians are trained in confined space procedures, electrical safety, and equipment handling. These steps help protect both property and personnel during service delivery.

Benefits of Hiring a Local Licensed HVAC Contractor
Choosing a local HVAC contractor in St. Catharines provides several tangible benefits, particularly when working with a company like J & S Heating And Air Conditioning.
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Familiarity with local codes
Local contractors are well-versed in municipal building codes and climate-related challenges. This ensures installations and upgrades are appropriate for the region’s seasonal fluctuations.
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Prompt service response
Proximity allows for faster dispatch of service teams during emergencies or scheduled maintenance.
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Ongoing service relationships
A local contractor typically maintains long-term service agreements with customers. This includes reminders for seasonal tune-ups and prioritized scheduling for regular clients.
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Accountability and community ties
Local companies are more directly accountable to their client base and have a stronger incentive to maintain service consistency.
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Permitting and inspection coordination
An HVAC contractor who operates within St. Catharines can efficiently manage the permitting process and coordinate with local inspection agencies, reducing delays in project timelines.
Request a Free Quote
We stand by our 67 years of experience serving St. Catharines and the Niagara Region, so we offer no-obligation, free quotes to all residential and commercial clients. Fill out our quote form, and we’ll let you know how much your desired product or service will cost.
View our current special offers for great deals on appliance installation, maintenance, and repairs in the Niagara Region.








Chamber of Commerce Award
J & S Heating and Air Conditioning was presented with an anniversary award by the St. Catharines-Thorold Chamber of Commerce, commemorating 55 years of exceptional service to the community. View our certificate of recognition and a photo of the presentation.

Free Maintenance Advice
I called to request a service call/estimate to correct a problem I've had for more than two years. After having another ...company come to replace a motor on my furnace, the motor has run continuously. This has caused enormously on our electricity bill. The staff who answered helped me fix the problem with a few quick instructions. No fee, no need for service call. What a huge relief. Thank you J&S for your honor!
-Kim








