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When your air conditioner is operating but your home still feels like a sauna, it's often a sign that something in your system isn't working the way that it should be. And in southern Ontario where the summer months are scorchers, even a small AC problem can impact your comfort levels and energy use. 

This guide outlines the root causes of why your AC is not cooling, what signs to look out for, and when to call a professional HVAC technician. 

When your air conditioner is running but your home still feels like it could come with its own hot weather warning, it could be due to one of the following reasons:

Airflow & Thermostat Problems

• Incorrect thermostat settings: Sometimes, even something as minimal as an incorrect thermostat setting can cause your AC system to blow warm air instead of cold air. Check to see if the thermostat settings are set to cool, and make sure the temperature isn't set too high.

• Dead thermostat batteries: Dead batters can cause your thermostat to malfunction and cause it to lose its connection with your AC system, leading to changes in air temperature.

• Dirty air filters blocking airflow: When you have a dirty air filter, it can restrict airflow from your AC unit and reduce your system's cooling process.

• Closed or blocked supply vents: If your air vents are blocked by dust, furniture, or curtains, or if your vents are closed, it will prevent proper airflow and distribution throughout your interior.

• Return air obstructions: Return air obstructions as a result of clutter in your utility room can limit the amount of air that's drawn into your air conditioner and redistributed back into the system.

• Blower issues reducing air movement: Wether it be a blower fan malfunction or a broken motor, either of these issues can reduce airflow.

• Smart thermostat programming errors: Smart thermostat malfunctions can create programming errors that affect your air conditioners cooling process and scheduling, which can make it appear like your unit si not blowing cold air.

Mechanical & Refrigerant Issues

• Low refrigerant levels: Low refrigerant levels, due to usage patterns and a lack of maintenance can reduce heat absorption, which means the air blown back into your home will be warm, rather than cold.

• Refrigerant leaks: Overtime, refrigerant lines can corrode or become damaged due to wear and tear, leading to refrigerant leaks, which again, will impact the air conditioner's ability to absorb heat.

• Frozen evaporator coils: A frozen evaporator coil can occur due to a lack of airflow or low refrigerant levels.

• Dirty condenser coils: Dust, dirt, and other debris in the outdoor unit due to a lack of maintenance can reduce heat transfer, causing warm air to blow throughout your home.

• Compressor problems: Compressor problems, whether it be due to a lack of maintenance or wear and tear, can prevent the air conditioner from undergoing its normal cooling process.

All AC problems are something to worry about. However, when it comes to identifying the issue at hand, some can be checked over by you, while others require the assistance of a professional HVAC technician:

Problems You May Be Able to Check Yourself

• Thermostat set incorrectly: Your thermostat settings may be set to heat rather than cool, or set at a higher temperature than needed, which you can fix yourself.

• Dirty filter: Most dirty air filters can be replaced or washed and reinstalled with ease, without the need for a technician.

• Tripped breaker: Visibly inspect the circuit breakers in your home. If your outlet is tripped, simply switch it back on and restart your air conditioner to see if its blowing cold air.

• Blocked outdoor unit: Remove debris like branches and leaves from around your outdoor unit to ensure proper airflow.

• Closed vents: Notice the vents in your home are closed or obstructed? Move things around to ensure airflow is no longer restricted.

Signs You Need a Professional HVAC Technician

• Warm air blowing consistently: If your air conditioner is blowing warm air despite your thermostat settings being correct and air filters clear, there could be internal issues that point to mechanical problems.

• Ice on refrigerant lines or coil: Ice on refrigerant lines or coils may be due to a clogged drain filter or refrigerant leaks, which should be handled by a professional.

• Loud or unusual noises: Screeching, banging, and buzzing noises often point to mechanical problems that may require component replacements.

• Water leaks around the indoor unit: This is often caused by clogged air filters, obstructed drain lines, or frozen evaporator coils.

• Repeated short cycling: When your system turns on and off regularly but doesn't cool down your interior, it may be due to electrical panel issues, frozen coils, dirty filters, or other internal malfunctions. 

Before contacting a technician and booking a professional service, there are a couple of troubleshooting checks you do that could provide insight into what's wrong with your air conditioner:

Basic Homeowner Checks

1. Confirm thermostat mode is set to cool: Start by ensuring your thermostat settings are correct.

2. Lower the temperature setting a few degrees: Lower the temperature a couple of degrees than the current room temperature.

3. Replace or inspect air filter: If you feel comfortable doing so, remove the dirty air filter and replace it with a new one.

4. Check breaker panel: Next, head to your electrical circuit breaker and confirm there are no tripped switches.

5. Inspect vents and registers: Ensure that your air vents are open and there is nothing blocking them to your air conditioning unit can blow cool air into your interior.

6. Clear debris from outdoor condenser unit: Then, head outside, and inspect the outdoor unit for any debris that may be blocking it.

7. Check for obvious ice buildup: Look for any visible ice buildup on the indoor or outdoor ac unit and its components.

• Do not keep your air conditioner running if you notice you have a frozen evaporator coil or that there is ice buildup on the outside of the indoor and outdoor condenser unit.

• Do not open sealed refrigerant components as refrigerant is highly toxic and should only be handled by a professional technician.

• Do not ignore burning smells, sparks, or other electrical warnings that could later lead to an electrical fire igniting in your home.

• Don't delay calling a professional. Even waiting a day can cause problems to develop further.

• Do not attempt DIY repairs on compressor, capacitors, or electrical wiring as you can put yourself in danger of being harmed. 

Sometimes an AC unit that isn't cooling properly can be traced back to a couple of common issues. These problems are closely related and often start as a minor issue before developing into a more serious performance problem.

Dirty Filter & Airflow Restriction

• Dirty filters restrict airflow and reduce the unit's overall cooling capacity, which can make it seem warmer inside than it actually is.

• Reduced airflow can cause the evaporator coils to freeze, causing weak airflow from the unit.

• Regular maintenance and filter changes are key to preventing these issues.

Refrigerant & Coil Problems

• Low refrigerant levels will reduce your air conditioner's ability to absorb heat before it's recirculated back into your home.

• Refrigerant leaks are the most common cause of low refrigerant levels, whether it be due to usage patterns broken refrigerant line seals, or other damages.

Note that all refrigerant-related issues should be inspected and repaired by a professional technician. 

If your air conditioner is operating but your interior still feels warm, it may be due to one of the following reasons:

• Your AC system may not be properly sized for your home's cooling load. Ensure that a manual J calculation is performed by a professional to determine what size unit your home actually needs.

• Poor insulation throughout your home can allow heat to enter faster than its removed, reducing the cooling performance of your air conditioner.

• Air leaks around your windows, doors, and attic can also lead to increased heat gain indoors.

• Higher indoor humidity levels can make your indoor air feel a lot warmer than it actually is.

• Older systems can lose their ability to operate as efficiently over time, which will reduce overall performance levels. 

Whether you repair or replace your current air conditioner depends on several factors including the following:

• Age of your system (most systems last 10 to 15 years before needing to be replaced).

• Frequent repairs and previous breakdowns may prompt a replacement whereas infrequent issues typically don't warrant an entirely new unit.

• Compare the cost of repairs vs. a replacement. If repairs are expensive and relatively around the same costs as a new unit, it may make sense to replace it.

• If your current AC system has poor efficiency ratings and your energy bills are expensive, opting for a new, energy-efficient model can help you save money long-term. 

A lot of AC problems stem from not taking care of your cooling system properly. Here's how you can prevent problems in the future:

• Seasonal tune ups: Aim to book a regular maintenance appointment with a technician at least once a year.

• Regular filter replacement: Replace air filters regularly. Most filters need to be replaced at least every three months, if not more often to maintain optimal performance levels.

• Keeping the outdoor unit clean: Keep the outdoor condenser unit clean and fee of visible debris that could restrict airflow.

• Monitoring thermostat performance: Routinely check your thermostat settings to ensure that its properly programmed.

• Catch issue early: Address small issues early on before they become major, costly repairs down the road.

• Improving airflow and indoor air quality: Improve airflow throughout your home by inspecting vents often and booking inspections to identify potential duct leaks or clogs that could impact your indoor air quality.