Skip to main content

Is your AC blowing hot air instead of cooling your home? Whether you’re in London or St. Thomas, this guide breaks down the most common air conditioner problems and what you can do to solve them. From simple thermostat issues to more serious refrigerant leaks, we’ll help you figure out if it’s a quick DIY or if you need an emergency AC fix.

Common Reasons Your AC is Blowing Hot Air

Incorrect Thermostat Settings

This is the easiest emergency AC fix. Either you forgot to change your thermostat to cool mode, or the temperature setting is too high for cooling.

Check the thermostat and make sure it is set to cool. Also, make sure the temperature setting is lower than the current room temperature.

Clogged Drain Line

Some DIY air conditioner problems in London ON are a simple fix. In this case, the drain line has debris in it, causing the unit to shut down to prevent damage. Turn off your AC and use a wet/dry vacuum or garden hose to flush out the clog. 

If clogging persists, apply vinegar or a specialized AC drain cleaner. Also, make sure the drain pan is clean.

Dirty Condenser Coils

If your AC isn’t cooling properly in St. Thomas, dirty condenser coils could be to blame. When these coils become clogged with dirt or debris, your system can’t release heat effectively, leading to poor cooling performance.

Rather than tackling it yourself, give us a call. Our technicians can safely clean and inspect your condenser coils to restore your system’s efficiency without the risk of damage. We’ll ensure everything is running smoothly so you can stay comfortable all summer long.

Clogged Air Filter

A dirty air filter restricts air flow and can cause your system to overheat and shut down. This is one of the easiest air conditioner problems to solve. Replace the filter with the correct one for your unit. Check filters monthly, especially during heavy use.

Frozen Evaporator Coils

When evaporator coils freeze, they can’t absorb heat, which leaves your AC blowing warm air.


Turn off your unit and let it thaw completely. Then check for blocked vents or a dirty air filter, both of which can restrict airflow and cause freezing.

AC Repairs that Require a Professional

Some air conditioning issues are best handled by a licensed HVAC technician. Here are a few that shouldn’t be DIY’d:

  • Low Refrigerant

A refrigerant leak will lower your system’s cooling power. A technician can locate the leak, repair it, and recharge your system safely.

  • Faulty Compressor

The compressor is the heart of your AC system. If it’s not working, your AC won’t cool properly and diagnosing or fixing it requires expert attention.

  • Leaking Ducts

Holes or cracks in your ducts can cause cool air to escape before it reaches your rooms. A professional can pinpoint and seal the leaks for improved efficiency.

  • Electrical Problems

Issues with wiring, breakers, or capacitors can impact your AC’s performance or even pose safety risks. Leave these repairs to a trained technician.

Trust Abode Home Comfort to Get Your AC Back Up and Running

At Abode Home Comfort, we’re here to help when your AC is not cooling in St. Thomas or you’re dealing with air conditioner problems in London ON. With over 60 years of HVAC experience, our certified team can quickly diagnose and fix your system whether it’s a clogged filter or a full emergency AC fix.

Don’t sweat it – contact us today to book your appointment and get your AC blowing cold air again fast.