Ottawa HVAC service providers were busier than ever this summer. With highs reaching 36°C and humidex values pushing it even further, Ottawa homeowners were discovering just how important a functioning air conditioning system really was.
If you’ve noticed weak airflow, unusual noises, or your system wasn’t cooling as it should, now is the time to act before the same problems come up next heat wave.
Our local HVAC expert, Tim Suitter, co-owner of Capital City Heating & Cooling, home of the free HVAC second opinion, has become a trusted voice during this summer’s extreme heat. He did interviews on both CTV News Ottawa and CFRA/iHeartRadio’s Kristy Cameron Show this summer, during June and July, offering practical advice for homeowners struggling to keep cool. In this recap, we’ll highlight some of the most important takeaways from those interviews, and link back to the full segments so you can listen in or share them with others.
If you’re looking for reliable Ottawa HVAC service to maintain or upgrade your system, or you need quick support from licensed Ottawa heating contractors, this guide is for you.
Why the Demand for Ottawa HVAC Service Was So High in 2025
Ottawa typically sees about 10–11 days above 30°C in a full summer. During late July of 2025, we’ve already well surpassed that number, seeing the “longest bout” of hot and humid weather, as mentioned by David Philips. This year’s extreme heat and humidity have created a “heat dome” over the region, which traps warm air and dramatically reduces nighttime cooling. These conditions put enormous stress on HVAC systems, especially older or poorly maintained units.
Even top-rated air conditioners have performance limits. As Tim Suitter explained, “A 100% efficient air conditioner can only reject heat up to about 35°C.” When the temperature outside exceeds that and humidity levels are high, even fully functional units may fail to cool a home adequately. Homeowners may find themselves paying for high energy usage without getting the desired comfort. Calling on Ottawa HVAC service professionals early can make all the difference in performance and safety.
Most Common Ottawa AC Problems During a Heat Wave
Systems That Completely Stop Cooling
A sudden lack of cooling is one of the most frequent issues homeowners face during a heat wave. Many systems shut down because the outdoor condenser cannot release heat efficiently. This is often due to restricted airflow or dirty coils. In a climate like Ottawa’s, when the outdoor temperature pushes past 35°C and the air is thick with humidity, an overworked system may simply quit. Expert Ottawa heating contractors can often resolve this quickly with targeted repairs.
Frequent Capacitor Failures
Capacitor issues are also common during extreme heat. Capacitors help start the motors that run your air conditioner. Suitter pointed out that while many inexpensive capacitors can be found online, they are often unreliable and not covered by warranty. More importantly, a blown capacitor may be a symptom of a larger problem. Capital City’s technicians look at the root cause, whether it’s high pressure, temperature spikes, or airflow restrictions, to prevent repeated failures. If you need help diagnosing a deeper issue, it’s best to call on trusted Ottawa heating contractors.
Thermostat Set, but Room Still Too Warm
Another widespread complaint involves systems that are running, but the indoor temperature won’t drop to the set point. For instance, a thermostat set to 21°C may result in an indoor temperature of 25°C. This is often due to dirty filters, clogged coils, or refrigerant issues. During a heat wave, even small inefficiencies in the system can prevent it from keeping up with the demand. A quick check from a licensed Ottawa HVAC service provider can often restore performance.
Maintenance Tips from Ottawa Heating Contractors
Clean the Outdoor Coil Thoroughly
The outdoor coil plays a critical role in removing heat from your home. Dirt, dust, and debris can clog the coil and reduce efficiency. Tim Suitter recommends homeowners shut off the power to their unit and gently spray the coil with a hose in a downward motion. Avoid using pressure washers or overly strong streams, as these can damage the fins. Preventative coil cleaning is one of the easiest tasks you can do between visits from your Ottawa heating contractors.
Replace Your Air Filter Monthly
Your HVAC system’s air filter traps dust, allergens, and debris, but it can also restrict airflow when clogged. During extreme heat events, airflow is crucial to ensure cooling efficiency. Suitter advises replacing your air filter every month during the summer to maintain performance and extend the lifespan of your unit. Your local Ottawa HVAC service technician can help you select the right type and size.
Keep the System Running, Even on Cooler Days
Some homeowners shut off their air conditioner when temperatures temporarily drop. However, this can allow humidity to build up inside the home. Air conditioners help dehumidify, and consistent operation prevents the system from working twice as hard when turned back on. Maintaining a stable indoor environment is key during prolonged periods of heat and humidity. If in doubt, reach out to Ottawa heating contractors for guidance.
AC Installation Ottawa: When Is It Time to Replace Your Unit?
Aging systems that break down repeatedly or struggle to cool the home may be due for replacement. According to Suitter, if your system is over 10 years old and facing expensive repairs, it may be time to consider upgrading. New air conditioners offer higher Seasonal Energy Efficiency Ratios (SEER), inverter compressors, and quieter operation, all while reducing energy costs.
We offer free second opinions to help homeowners make informed choices. They provide detailed estimates comparing the cost of repairs to full replacement, assisting customers in evaluating the long-term value of a new system. If you’re comparing companies for AC installation in Ottawa, be sure to ask about rebates and energy efficiency ratings.
You can explore their available AC installation options in Ottawa to learn more about what models and savings might be available to you. We also recommend checking out our other blog explaining when to replace your old AC.
What Makes a Trustworthy Ottawa HVAC Company?
Finding the right HVAC contractor is crucial when temperatures are extreme. Suitter recommends verifying that the company you choose employs fully licensed technicians and has proper insurance. In addition, look for service providers who offer transparent pricing, detailed estimates, and clear communication.
Capital City stands out because it offers transparent pricing on all services, employs fully licensed Ottawa heating contractors, provides free second opinions on major repairs or installations, and gives homeowners direct access to manufacturer rebates through trusted brands like Bryant and Daikin. You can also view our verified reviews and location here on our Google Business Profile.
Stay Cool and Safe in Ottawa’s Extreme Heat
When humidex values stay close to 30°C overnight, there’s little opportunity for homes to cool naturally. These sustained high temperatures put residents at risk of heat-related illnesses, especially seniors and those with respiratory issues. Tim Suitter emphasized that air conditioning is essential for health and safety.
To stay ahead of problems, homeowners should schedule routine maintenance, monitor their system’s performance, and act early if cooling performance declines. With heat waves becoming more frequent, it’s worth investing in a reliable Ottawa HVAC service, like Capital City Heating & Cooling, to ensure your system is ready.
Request your service or consultation today
Schedule your HVAC repair, maintenance, or new AC installation in Ottawa today. Contact our trusted team at Capital City Heating & Cooling.
We proudly serve Ottawa and the surrounding communities with licensed technicians, competitive pricing, and unmatched customer care.
Frequently Asked Questions (FAQs)
What does HVAC service in Ottawa include?
HVAC service includes inspecting, cleaning, and testing your air conditioner and furnace to ensure optimal operation, energy efficiency, and system safety. Ottawa HVAC service technicians typically offer seasonal tune-ups as part of their maintenance plans.
How often should I replace my air filter?
It’s recommended to replace your air filter every 1–3 months. During high-usage months like summer, changing it monthly helps maintain proper airflow and cooling performance. Ask your Ottawa heating contractors for recommendations on the best filter for your system.
Should I repair or replace my AC?
If repair costs exceed 50% of the price of a new unit, replacement may be more cost-effective in the long run, especially with available rebates. Your Ottawa HVAC service technician can help you weigh the options.
How long does a new AC installation take?
Most residential installations can be completed in one day. The process includes removing the old unit, installing the new one, and testing the system thoroughly. When planning AC installation in Ottawa, make sure to ask about timelines, permits, and cleanup.
Are rebates available for new AC units in Ottawa?
Yes. Manufacturers like Bryant and Daikin offer seasonal rebates. You can explore current promotions at Bryant Canada or ask your Ottawa heating contractors for rebate help.