As the summer temperatures soar across Brampton, Mississauga, and the Greater Toronto Area (GTA), a dependable air conditioning system becomes essential. But what if your AC unit is running, yet your home still isn’t cooling down? This is a common issue for many homeowners in Ontario.
If your air conditioner is running but not blowing cold air, several potential causes could be behind the problem. In this guide, we walk you through the most frequent reasons and offer practical solutions.
- Clogged or Dirty Air Filters
Dirty air filters are a leading cause of reduced AC performance. These filters trap dust, pollen, and airborne debris to protect your system and improve indoor air quality.
What to do: Check your AC filters every 2-3 months. If they appear dirty, replace or clean them. Clean filters ensure better airflow, increase cooling efficiency, and reduce energy bills.
- Incorrect Thermostat Settings
Your thermostat plays a key role in your AC’s operation. Even small changes or malfunctions can prevent the unit from cooling properly.
What to do: Make sure the thermostat is set to “cool” and the temperature is lower than the current room temperature. If it uses batteries, replace them regularly. Try resetting it to resolve any internal glitches.
- Low Refrigerant Levels
Refrigerant is the fluid that absorbs heat from your home and cools the air. If refrigerant levels drop, your system can’t cool effectively.
What to do: Low refrigerant means there’s a leak. Only licensed HVAC technicians can safely detect and repair refrigerant issues. Remember, air conditioners in Canada are sealed systems and should never require a refill unless there’s a problem.
- Leaky or Damaged Ductwork
Air ducts distribute cooled air throughout your home. Leaks, holes, or poor insulation can result in significant energy loss and warm spots.
What to do: Inspect accessible ducts for damage or gaps. Seal small leaks with duct tape, but large or hidden issues (especially within walls or ceilings) should be evaluated by HVAC professionals.
- Electrical Problems in AC System
Air conditioners rely on various electrical components like capacitors, contactors, and circuit breakers. A fault in any of these can disrupt the cooling cycle.
What to do: Check your electrical panel and flip the breaker for your AC off and on. If that doesn’t help, book an HVAC inspection to avoid potential hazards.
- Frozen Evaporator Coils
Frozen coils prevent your system from effectively cooling your space and can stem from airflow restrictions or refrigerant issues.
What to do: Turn off your system to allow it to thaw. Then replace your air filter. If coils continue freezing, professional help is required to diagnose airflow or refrigerant problems.
- Old or Incorrectly Sized AC Unit
An aging AC system or one that’s too small or too large for your home can lead to uneven temperatures, high energy bills, and inefficient cooling.
What to do: If your AC is 10-15 years old or frequently struggles, it might be time for an upgrade. Learn more about choosing the right system by visiting our guide: What is the Best Air Conditioner in Canada?
Additional Signs Your AC Needs Professional Service
- AC blowing warm air
- Strange noises from the unit
- AC turning on and off frequently (short cycling)
- Increased humidity levels indoors
Need Reliable Air Conditioning Services in Brampton, Mississauga, or the GTA?
We at Lifetime Building Services, are specialized in residential air conditioner repair, maintenance, and installation. Whether you’re dealing with an AC not cooling, loud noises, or outdated equipment, our certified technicians are ready to help.
We proudly serve homeowners across Brampton, Mississauga, and the GTA.
Don’t suffer through a hot Ontario summer. Contact Lifetime Building Services today for expert air conditioning solutions that keep your home cool and comfortable.