AC Not Cooling? 5 Common Spring Problems in London, ON & How to Fix Them
Is your air conditioner struggling to keep up as spring temperatures rise in London, Ontario? Don't sweat it. Here are the 5 most common spring AC problems and exactly what to do about them.
Spring in London, Ontario means rising temperatures — and the first time you turn on your AC after months of dormancy. But what happens when warm air comes out of your vents instead of cold? Before you panic, know that most spring AC problems are common, diagnosable, and often fixable. This guide covers the 5 most frequent issues we see every spring, with DIY fixes for simple problems and clear guidance on when to call a TSSA-certified technician.
5 Most Common Spring AC Problems in London, ON
AC Running But Not Cooling
Your outdoor unit is humming, the fan is spinning, but warm air is coming from your vents. This is the #1 spring complaint we receive.
Most common causes: Dirty air filter (restricted airflow), low refrigerant (leak), frozen evaporator coil, or dirty condenser coil.
🔧 DIY Fix
Start with the easiest fix: check and replace your air filter. A clogged filter is responsible for 30% of no-cooling calls. If the filter is clean, check your outdoor unit for debris. If both are fine, call a professional.
Ice on Refrigerant Lines or Outdoor Unit
You notice frost or ice on the copper lines connecting your indoor and outdoor units — or ice forming on the outdoor unit itself in warm weather.
Most common causes: Restricted airflow (dirty filter, blocked vents, dirty evaporator coil) or low refrigerant from a leak.
🔧 DIY Fix
Turn off your AC immediately and switch the thermostat to FAN ONLY to thaw the ice. Running a frozen AC can destroy the compressor ($1,500-$2,500 replacement). Once thawed (1-3 hours), check your filter. If the filter is clean, call a technician.
Outdoor Unit Won't Turn On
Your thermostat is set to cool, but the outdoor condenser unit is completely silent — no fan, no compressor hum.
Most common causes: Tripped circuit breaker, failed run capacitor, failed contactor, or faulty thermostat.
🔧 DIY Fix
Check your electrical panel for a tripped breaker. If it's tripped, reset it once. If it trips again immediately, call a technician — do not keep resetting. If the breaker is fine, check your thermostat settings and batteries.
Weak Airflow from Vents
You can feel cold air, but it's barely coming out of your vents — not enough to cool the room.
Most common causes: Clogged air filter (most common), blocked or closed vents, dirty blower wheel, or ductwork issues.
🔧 DIY Fix
Check and replace your air filter. Ensure all supply vents are open and unobstructed by furniture. Check return air grilles for blockages. If airflow doesn't improve, call for professional inspection.
Water Leaking Indoors
You notice water pooling around your indoor air handler or furnace — or water stains on your ceiling near an air vent.
Most common causes: Blocked condensate drain line, frozen evaporator coil thawing, or a cracked drain pan.
🔧 DIY Fix
Turn off your AC. If you can access the condensate drain, check for visible blockage. Use a wet/dry vac to clear the line if you're comfortable. If water continues to leak or you see ceiling stains, call a professional immediately — water damage can be extensive.
Abdullah Ghzail – Lead TSSA-Certified Technician
"After hundreds of spring AC calls across London, the most common mistake I see is homeowners running their AC for hours with a clogged filter or ice on the lines. Both can cause serious damage to your compressor — the most expensive part of your AC ($1,500-$2,500 to replace). My advice: if your AC isn't cooling properly after checking the filter and breaker, call us. A $175 diagnostic could save you thousands in compressor replacement. And remember, we never charge after-hours surcharge — same price at 8 PM as 8 AM."
Spring AC Maintenance Checklist
Prevent problems before they start with this simple spring maintenance checklist:
- Change your air filter — Replace every 1-3 months. A clean filter prevents 30% of AC problems.
- Clear debris around outdoor unit — Remove leaves, grass, and debris. Maintain 2 feet of clearance.
- Check your condensate drain — Pour a cup of vinegar down the drain to prevent algae buildup.
- Test your AC before the first heat wave — Turn it on for 15-30 minutes on a warm spring day to catch issues early.
- Schedule professional maintenance — Our spring AC tune-up includes coil cleaning, refrigerant check, and electrical inspection. From $149.
What London Homeowners Say About AC Repair
"Our AC stopped cooling on the first hot day near Springbank Park. I checked the filter like the guide said — it was completely clogged. Changed it and the AC worked perfectly. Saved me a service call. This guide is spot on for basic troubleshooting. Will call Hawana when we need professional service."
— Heath B. London ON · June 2025
"Our AC was running but not cooling near White Oaks. I followed the troubleshooting steps — filter was clean, breaker was fine. Called Hawana. Abdullah came the same day, found a refrigerant leak, repaired it, and recharged the system for $480. Honest diagnosis and fair price. The guide helped me know it wasn't a simple DIY fix."
— Dell T. London ON · July 2025
"Ice on my AC lines near Masonville — this guide said to turn it off and call a pro. Abdullah diagnosed a dirty evaporator coil and cleaned it for $250. He also showed me how to change my filter monthly. The AC works perfectly now. Great advice and even better service. Will use Hawana for all our HVAC needs."
— Firth K. London ON · August 2025
AC Troubleshooting FAQ — Spring 2026
The most common causes are: a dirty air filter restricting airflow; low refrigerant from a leak; a frozen evaporator coil; a failed capacitor or contactor; or a dirty condenser coil. Start by checking your air filter and outdoor unit for debris. If those are clean, call a TSSA-certified technician for diagnosis.
Our diagnostic fee is $175, which is waived if you proceed with the repair. Common repairs: capacitor replacement $150-$350; contactor replacement $150-$300; refrigerant leak repair $200-$600; coil cleaning $150-$300. We provide upfront pricing before any work begins — no surprises.
Yes. A severely clogged air filter restricts airflow across the evaporator coil, causing it to freeze. Once frozen, air cannot pass through, and your AC will blow warm air. Change your filter every 1-3 months. This simple fix solves 30% of no-cooling service calls.
Signs include: AC running constantly but not cooling; ice forming on refrigerant lines; hissing or bubbling sounds from the unit; higher than normal energy bills; and warm air from vents. If you suspect a leak, call a professional immediately — DIY refrigerant handling is illegal and dangerous.
Ice formation indicates restricted airflow (clogged filter, dirty coils, blocked vents) or low refrigerant. Turn off your AC immediately and run the fan only to thaw the ice. Once thawed, check your filter. If the filter is clean, call a technician — running a frozen AC can damage the compressor ($1,500-$2,500 replacement).
Once per year, ideally in spring (April-May) before cooling season begins. Annual maintenance improves efficiency by 15%, prevents 90% of emergency breakdowns, and maintains manufacturer warranty validity. Our Basic Maintenance Plan is $149/year and includes a complete AC tune-up.
First, check your thermostat (set to cool, temperature below room temp). Check your circuit breaker for a tripped switch. Check your air filter. Check the outdoor unit for debris. If none of these work, call our 24/7 emergency line at (647) 550-4220 — we have zero after-hours surcharge.
Apply the 5,000 Rule: multiply your AC's age by the repair cost. If the total exceeds $5,000, replacement is better. For a 12-year-old AC with a $400 repair: $400 x 12 = $4,800 — repair. For a 15-year-old AC with a $600 repair: $600 x 15 = $9,000 — replace. New AC starts at $3,500 installed.
Most common causes: a tripped circuit breaker; a failed run capacitor ($150-$350 repair); a failed contactor ($150-$300); a faulty thermostat; or a blown fuse. Check your breaker first. If it's not tripped, call a technician — capacitor and contactor issues require professional diagnosis.
AC size is measured in tons. A 1,500-2,000 sq ft home typically needs 2-3 tons. Proper sizing requires a professional load calculation (Manual J) considering square footage, insulation, windows, and sun exposure. Never guess — an incorrectly sized AC wastes energy, short-cycles, and fails prematurely. We include a free load calculation with every quote.
Don't Sweat It — Get Your AC Fixed Today
If your AC isn't cooling, don't wait until the first 30°C heat wave. Call Hawana HVAC for fast, reliable AC repair in London, Ontario. 24/7 emergency service with zero after-hours surcharge.
📞 (647) 550-4220
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