Open Monday-Friday: 8am-5pm
16700 Sideroad 17A, Sunderland, ON L0C 1H0
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Our Services
WE OFFER RESIDENCIAL & COMMERCIAL SERVICES
Heating Solutions
From high-efficiency furnace installations to intricate in-floor radiant systems, we provide comprehensive heating solutions designed to combat the toughest Ontario winters. Our focus is on precision, safety, and long-term energy performance for your home or business.
Cooling & Climate Control
Stay comfortable when the temperature spikes. We specialize in the installation, repair, and seasonal maintenance of central air conditioning and heat pump systems. We ensure your space remains cool, dehumidified, and perfectly balanced throughout the summer months.
Customized Comfort
& Ventilation
We take building science seriously. Whether it’s designing custom ductwork for new construction, installing HRV/ERV air exchange systems, or crafting the perfect indoor environment, we provide the engineering expertise needed to improve air quality and overall system efficiency.
Backup Power Systems
Don't be left in the dark. As an Authorized Generac Dealer, we provide turnkey backup power solutions that keep your essential systems running automatically when the grid fails. From professional sizing to annual maintenance, we ensure your property stays powered and protected.
WORKING WITH INDUSTRY LEADERS
Whether you're looking to install a new furnace in your home, a geothermal system for your business, or require emergency repairs, we're here to provide you with the best options. As a proud Carrier dealer and Smart Power supplier, we offer the most innovative and advanced products, ensuring you receive top-of-the-line technology and efficiency.
FAMILY OWNED SINCE 1982
Elevating Comfort Across Durham Region, York Region, Kawartha Lakes & more!
Welcome to Harold Heating & Cooling — where innovation meets tradition in the heart of your home and business. For over 40 years, our family-owned company has been at the forefront of heating and cooling solutions, serving residential and commercial clients with unparalleled dedication.
Save long term with a solar battery back up system.
We Install Solar Smart Power Battery Solutions
Smarter Power delivers commercial energy storage projects to reduce peak costs and maximize savings, while equipping authorized dealers with the Smart Battery Storage System (SBSS) to serve residential customers
40+ Years of Service
4.5 Star Rating
24/7 Emergency Support
100% Eco-Friendly Options
REAL STORIES, REAL SATISFACTION
Hear What Our Customers Think
The service I received was exceptional. The individuals that installed my air conditioner were clean and courteous. I would highly recommend Harold's Heating.
- Bev Primrose
Excellent service and quick response. They installed a new furnace and hot water tank for me as well as perform my service. Would recommend.
Thank you to Harold’s Heating for prompt and efficient service. We really appreciated JP’s attention to detail. His customer service and diagnostic skills are exemplary!
Had Carly out today! She did a very thorough cleaning and check for furnace and fireplace. Very good at explaining and communicating what she was doing, Great job! Thanks all!