AC Repair Ottawa: Most Common Problems & What They Cost
Your air conditioner picks the worst possible moment to break down — typically on the hottest day of the year, when every HVAC company in Ottawa is booked solid. Knowing what common AC repairs actually cost helps you avoid panic decisions, spot fair pricing, and decide whether that repair bill makes sense or whether it’s time to replace the unit entirely.
At Gas Man Ottawa, we handle air conditioner repair calls across the city every summer — from simple capacitor swaps to complex compressor replacements. This guide breaks down the most common AC problems Ottawa homeowners face, what each repair typically costs, and what you should check before calling a technician.
Need AC repair now? Call (613) 880-3888 — we offer same-day service when available.
What to Check Before Calling for AC Repair
Before you pick up the phone and pay a diagnostic fee, run through these quick checks. You’d be surprised how often the fix is something you can handle yourself in under five minutes.
Check Your Thermostat
Make sure the thermostat is set to “cool” (not “heat” or “off”), the fan is set to “auto,” and the set temperature is at least 3°C below the current room temperature. If you have a battery-powered thermostat, replace the batteries — dead batteries are one of the most common “broken AC” calls we get. A smart thermostat eliminates this issue entirely.
Check Your Air Filter
A clogged filter restricts airflow so severely that your AC can freeze up, blow warm air, or shut down on a safety limit. Pull the filter out and hold it up to a light. If you can’t see through it, replace it immediately. During Ottawa’s cooling season, check your filter every month — especially if you have pets.
Check the Circuit Breaker
Your air conditioner typically runs on its own dedicated circuit. If the breaker has tripped, reset it once. If it trips again immediately, stop — there’s an electrical fault that needs professional diagnosis. Don’t keep resetting a breaker that keeps tripping.
Check the Outdoor Unit
Walk outside and look at your condenser unit. Is it running? Is the fan spinning? Is it buried in leaves, grass clippings, cottonwood fluff, or debris? Restricted airflow around the outdoor unit is a common summertime issue in Ottawa. Clear at least 60 cm (2 feet) of space on all sides.
Check the Furnace Switch
Your air conditioner relies on your furnace blower to circulate cool air. The furnace has a power switch that looks like a light switch — often on or near the furnace. If someone accidentally flipped it off, your AC won’t work even though the outdoor unit runs fine.
If none of these solve the problem, it’s time to call a professional. Keep reading to understand what the technician might find and what it will cost.
Common AC Repair Costs in Ottawa
The table below covers the most frequent air conditioner repairs we see in Ottawa homes. Costs include parts and labour and reflect typical ranges for residential central air conditioning systems.
| Repair | Typical Cost | How Common |
|---|---|---|
| Diagnostic / service call fee | $80 – $150 | Every call |
| Capacitor replacement | $150 – $350 | Very common |
| Contactor replacement | $150 – $400 | Common |
| Refrigerant recharge (R-410A) | $200 – $500 | Common |
| Refrigerant leak repair | $300 – $1,000 | Common |
| Condensate drain cleaning | $100 – $250 | Very common |
| Thermostat replacement | $150 – $400 | Common |
| Fan motor replacement (condenser) | $400 – $800 | Moderate |
| Blower motor replacement | $500 – $1,200 | Moderate |
| Evaporator coil replacement | $1,000 – $2,500 | Less common |
| Compressor replacement | $1,500 – $3,000+ | Less common |
| Circuit board / control board | $400 – $900 | Moderate |
| TXV (expansion valve) replacement | $400 – $800 | Less common |
Important note: Most HVAC companies in Ottawa charge a diagnostic or service call fee ($80–$150) just to send a technician to your home. This covers the trip and the time to diagnose the problem. At Gas Man Ottawa, the diagnostic fee is typically applied toward the repair if you proceed with the work.
The Most Common AC Problems Explained
Understanding what’s actually wrong with your air conditioner helps you evaluate whether a repair quote is reasonable and whether the fix makes financial sense for the age of your unit.
Capacitor Failure — $150 to $350
The capacitor is a small cylindrical component that gives your compressor and fan motors the electrical boost they need to start. Capacitors are the single most common AC failure — they degrade naturally over time and Ottawa’s heat waves accelerate the process. Symptoms include the AC humming but not starting, the outdoor fan not spinning, or the system short-cycling (turning on and off rapidly). The good news: capacitor replacement is fast, affordable, and something any technician can do on the spot.
Contactor Failure — $150 to $400
The contactor is essentially an electrical relay that turns the compressor and condenser fan on and off when the thermostat calls for cooling. Over time, the contact points inside wear down, pit, or weld together — causing the unit to either not start at all or run continuously without shutting off. A contactor that’s stuck closed means your outdoor unit runs non-stop, even when the thermostat is satisfied, which drives up your electricity bill and wears out the compressor prematurely. Replacement is straightforward and relatively inexpensive.
Refrigerant Leak — $300 to $1,000+
Your air conditioner doesn’t “use up” refrigerant the way a car uses gasoline. If refrigerant is low, you have a leak. Common leak locations include the evaporator coil, service valve connections, and the line set (the copper lines running between the indoor and outdoor units). A technician will locate the leak, repair it, and then recharge the system with the correct amount of R-410A refrigerant. Symptoms include reduced cooling, ice forming on the refrigerant lines or evaporator coil, and the system running constantly without reaching the set temperature. The cost depends largely on the leak location — a valve connection is cheap to fix, but a leaking evaporator coil is a major repair.
Frozen Evaporator Coil
If you see ice on the indoor refrigerant line or the AC is blowing warm air, the evaporator coil may be frozen. This is often a secondary symptom rather than a standalone problem. The three most common causes are a dirty air filter restricting airflow (free fix — just change the filter), low refrigerant due to a leak (see above), and a malfunctioning blower motor not moving enough air across the coil. Turn the system off, switch the fan to “on” to let it thaw, and call for service. The repair cost depends entirely on the underlying cause.
Condensate Drain Clog — $100 to $250
Your AC removes humidity from the air, and that moisture has to go somewhere — it drains through a condensate line. In Ottawa’s humid summers, algae and mould can grow inside this line, blocking it. When the drain clogs, water backs up and triggers a safety float switch that shuts the system down, or worse, water overflows onto your furnace, ceiling, or floor. Clearing a clogged drain is a quick fix. Pouring a cup of white vinegar down the drain line every few months during cooling season prevents the problem entirely.
Fan Motor Failure — $400 to $800
The condenser fan motor sits in the outdoor unit and blows air across the condenser coil to dissipate heat. When it fails, the outdoor unit can’t reject heat properly, causing the compressor to overheat and shut down on its high-pressure safety switch. You might hear the compressor running but notice the fan isn’t spinning, or hear grinding or squealing noises from the outdoor unit. Motor replacement typically takes 1–2 hours and restores full cooling capacity.
Blower Motor Failure — $500 to $1,200
The blower motor is located in your furnace and pushes conditioned air through the ductwork to every room. It runs for both heating and cooling, so it logs more hours than almost any other component. When a blower motor fails, you’ll get no airflow from the vents even though the outdoor unit is running normally. Variable-speed blower motors (found in higher-efficiency furnaces) cost more to replace than standard single-speed motors. Since the blower serves your furnace as well, this repair affects both your cooling and heating.
Compressor Failure — $1,500 to $3,000+
The compressor is the heart of your air conditioning system — it pressurizes refrigerant and circulates it between the indoor and outdoor coils to transfer heat. Compressor failure is the most expensive AC repair and is often the point where homeowners decide to replace the entire unit instead of sinking $2,000–$3,000 into an aging system. Compressor failures are typically caused by refrigerant leaks that went unrepaired (running low on refrigerant damages the compressor over time), electrical issues such as failed capacitors or voltage surges, or lack of regular maintenance. If your AC is under 8 years old and the compressor is still under the manufacturer’s parts warranty, replacement may be worthwhile. If the unit is 12–15 years old, a full air conditioner replacement usually makes more financial sense.
Evaporator Coil Leak — $1,000 to $2,500
The evaporator coil sits inside your furnace or air handler and is where refrigerant absorbs heat from your home’s air. Over time, the coil can develop pinhole leaks due to formicary corrosion — a chemical reaction caused by VOCs in household air reacting with the copper tubing. Symptoms are identical to a refrigerant leak: reduced cooling, ice formation, and the system running constantly. Unfortunately, evaporator coil leaks can’t be patched reliably — the coil usually needs to be replaced. This is a labour-intensive repair because the coil is inside the air handler and often requires partial disassembly to access. If the coil leaks on a unit that’s 10+ years old, weigh the repair cost against replacement.
Circuit Board Failure — $400 to $900
Modern air conditioners use electronic control boards to manage compressor staging, fan speeds, defrost cycles, and safety shutdowns. Power surges (common during Ottawa’s summer thunderstorms), moisture intrusion, and insect damage can all fry a circuit board. Symptoms are erratic — the system may not respond to the thermostat, display error codes, or exhibit random behaviour like turning on and off unpredictably. Replacement cost depends on the board’s availability; common brands are cheaper while discontinued models may require aftermarket or universal boards.
AC Repair vs. Replace: When Does It Make Sense?
Not every repair is worth doing. Use these guidelines — the same logic our technicians apply — to decide whether to repair or replace your air conditioner:
The 50% Rule
If the repair costs more than 50% of the price of a new air conditioner, replacement is usually the smarter financial decision. A new central AC installation in Ottawa typically runs $3,500–$6,500 depending on size and efficiency, so any single repair over $1,750–$3,250 likely doesn’t make sense — especially on an older unit.
The Age Factor
Under 8 years old: Almost always worth repairing. The unit has years of life left, and most major components are still under manufacturer warranty. 8 to 12 years old: Repair if the cost is reasonable (under $1,000 for most repairs), but start planning for replacement. 12 to 15+ years old: Strongly consider replacement, especially for major repairs like compressors or evaporator coils. Newer units are significantly more efficient — a 15-year-old AC might be 10 SEER while a new unit delivers 16–18 SEER, cutting your cooling costs by 30–40%.
The Frequency Factor
One repair per season is normal wear and tear. But if you’re calling for AC repair two or three summers in a row, the system is telling you it’s nearing end of life. The cumulative cost of serial repairs often exceeds replacement when you factor in the efficiency losses of an aging system.
R-22 Refrigerant (Freon) — Replace, Don’t Repair
If your air conditioner uses R-22 (Freon) refrigerant, replacement is the only practical option for any major repair. R-22 was phased out in Canada in 2020, and remaining supplies are extremely expensive — $100+ per pound, compared to $30–$50 per pound for R-410A. Any AC still running on R-22 is at least 10–15 years old and cannot be recharged economically. Upgrading to a modern R-410A system saves on both refrigerant costs and energy consumption.
Not sure whether to repair or replace? Call Gas Man Ottawa at (613) 880-3888 for an honest assessment — we’ll never push a replacement when a repair makes more sense.
Emergency AC Repair in Ottawa
Ottawa summers are short but intense. When temperatures hit 30°C+ with the humidex pushing past 40°C, a broken air conditioner goes from inconvenient to potentially dangerous — especially for young children, elderly family members, and anyone with respiratory conditions.
What Counts as an Emergency?
An emergency AC repair is warranted when vulnerable people (infants, elderly, those with medical conditions) are in the home during extreme heat, when indoor temperatures are climbing above 30°C and won’t drop without cooling, or when you notice signs of a safety issue like burning smells, sparking, or tripped breakers that keep tripping.
Emergency Service Costs
Expect to pay a premium of $50–$200 above standard rates for after-hours, weekend, or holiday service. While this adds to the bill, it ensures a technician reaches you when the situation demands it. The repair itself costs the same — it’s the service call that carries the premium.
While You Wait
Close blinds on sun-facing windows to reduce heat gain. Open windows on the shaded side of the house if there’s a breeze. Run fans to circulate air. Avoid using the oven, dryer, or other heat-generating appliances. Move to the coolest room — usually a basement. Stay hydrated.
How Annual Maintenance Prevents Expensive Repairs
The most common AC failures — capacitor degradation, refrigerant leaks, clogged drains, dirty coils, electrical connection issues — are all detectable during a routine air conditioner maintenance visit. An annual tune-up ($100–$200) checks and tightens electrical connections, tests capacitor strength (catching weak ones before they fail), cleans condenser and evaporator coils, clears the condensate drain, checks refrigerant charge and looks for leaks, lubricates moving parts, and verifies thermostat calibration.
The math is simple: a $150 maintenance visit that catches a failing capacitor saves you the $80–$150 emergency diagnostic fee plus the stress of a breakdown on the hottest day of the year. Over the 15-year life of an air conditioner, consistent annual maintenance can prevent thousands of dollars in avoidable repairs and extend the system’s lifespan by 3–5 years.
Gas Man Ottawa offers comprehensive AC maintenance that covers all these items. Schedule yours before the summer rush — the best time is April or May, before your system needs to work at full capacity.
What Affects AC Repair Costs in Ottawa?
Several factors determine where your specific repair falls within the price ranges listed above:
System Type
Central air conditioner repair costs more than ductless mini-split repair because central systems have more components and the work often involves accessing parts inside the furnace or air handler. Heat pump repairs tend to be comparable to AC repairs since the cooling components are essentially the same.
Brand and Parts Availability
Common brands like Lennox, Carrier, Goodman, and Daikin have readily available parts. Discontinued brands, imported units, or high-end systems may require special-order parts that add time and cost to the repair.
Time of Year
Peak season (June through August) is when every HVAC company in Ottawa is at maximum capacity. Scheduling flexibility drops and wait times increase. If you can schedule non-urgent repairs in spring or fall, you’ll often get faster service and may find better availability.
Accessibility
An outdoor unit that’s easily accessible costs less to service than one tucked behind a fence, under a deck, or on a rooftop. Indoor components buried behind finished walls or in tight crawlspaces add labour time.
Warranty Coverage
Most central air conditioners come with a 5-year parts warranty, and many offer 10-year parts warranties if the unit was registered after installation. If your system is still under warranty, the parts are covered by the manufacturer — you only pay for labour and refrigerant. Check your paperwork or call the manufacturer with your unit’s model and serial number to verify coverage.
Frequently Asked Questions: AC Repair in Ottawa
How much does AC repair cost in Ottawa?
Most AC repairs in Ottawa cost between $150 and $1,000, with the average repair falling in the $250–$500 range. Simple fixes like capacitor replacement run $150–$350, while major repairs like compressor or evaporator coil replacement can reach $1,500–$3,000+. A diagnostic service call fee of $80–$150 applies to every visit. Call Gas Man Ottawa at (613) 880-3888 for a diagnosis and upfront quote.
Why is my AC running but not cooling?
The most common causes are a dirty air filter restricting airflow, low refrigerant due to a leak, a failed capacitor preventing the compressor from starting, a dirty condenser coil reducing heat rejection, or a frozen evaporator coil. Start by checking the filter and the outdoor unit for debris. If those look fine, you likely need a professional diagnosis to identify the specific component that’s failing.
Is it worth repairing a 15-year-old air conditioner?
Usually not, unless the repair is minor (under $300–$500). A 15-year-old AC is near or past its expected lifespan and likely runs on R-22 refrigerant, which is prohibitively expensive to recharge. A new air conditioner installation will be 30–40% more energy efficient and come with a fresh warranty. Visit our repair or replace guide for more details.
How often does an air conditioner need maintenance?
Once per year — ideally in spring before the cooling season begins. Annual AC maintenance catches small problems before they become expensive breakdowns, maintains energy efficiency, and can extend your system’s lifespan by 3–5 years. Between professional visits, check your air filter monthly during the cooling season.
Why does my AC keep tripping the breaker?
A tripping breaker usually indicates an electrical issue — a failing compressor drawing excessive current, a short in the wiring, a grounded compressor, or a bad capacitor. It can also happen if the breaker itself is weak or undersized. Don’t keep resetting the breaker; call for service to prevent potential fire hazards or further damage to the compressor. This is one situation where prompt AC repair can prevent a much more expensive compressor failure.
How long should an air conditioner last in Ottawa?
A well-maintained central air conditioner in Ottawa typically lasts 12–18 years. Ottawa’s climate is relatively gentle on AC systems compared to southern climates — our cooling season runs roughly June through September, which means fewer total operating hours than a unit in Texas or Florida. Regular annual maintenance, keeping the area around the outdoor unit clear, and promptly addressing small repairs all extend the system’s life toward the upper end of that range.
Can I run my AC if it’s leaking water?
It depends on where the leak is. If water is dripping from the indoor unit or overflow pan, turn the system off and call for service — a clogged condensate drain is the likely cause, and continued operation can cause water damage. If water is pooling around the outdoor unit on a humid day, that’s usually normal condensation and isn’t a concern. When in doubt, shut the system off and call for a diagnosis.
What is a diagnostic fee and why do HVAC companies charge it?
The diagnostic fee ($80–$150 in Ottawa) covers the technician’s travel time, vehicle costs, and the time spent inspecting your system to identify the problem. It’s standard across the industry. At Gas Man Ottawa, the diagnostic fee is typically credited toward your repair if you proceed with the recommended work — so you’re essentially getting the diagnosis free when you choose us for the repair.
Get Your AC Fixed Right — Call Gas Man Ottawa
When your air conditioner breaks down, you want a fast, honest diagnosis and a fair price. Gas Man Ottawa provides AC repair across Central Ottawa, Kanata, Orleans, Barrhaven, Nepean, Manotick, and Gloucester — with same-day service when available.
Call (613) 880-3888 or contact us online for a diagnosis and upfront repair quote. Check our customer reviews and our service guarantee.
Need help with other HVAC issues? See our guides on furnace repair, heat pump repair, and HVAC maintenance.