Top Reasons Your AC System Is Not Blowing Cold Air

When the weather warms up the first thing most people reach for is the air conditioning unit. It’s not that you don’t appreciate the warmth, but when you’re inside it’s nice to control the temperature and keep it comfortable. This gives you a respite from the heat and even improves productivity.

The problems really start when you turn on the AC system and it’s not blowing out any cold air. That’s when you’ll wish you had got your local industrial air conditioning specialist to service it for you. Of course, you can give them an emergency call out to address the issue. It can also help to understand the most common reasons why this is happening.

No Power

The first thing to check is that your Ac system has power. It should have its own power circuit which means you can check the circuit breaker in your fuse box. If this is on then you’ll want to check that the unit is also on.

Most systems have a wall switch that is hardwired to the unit, check this has been turned on and check for another switch on the unit. These can often be harder to find.

In short, even if the unit isn’t blowing out cold air, you would expect to see lights on.

Thermostat Issue

If the power is on and you still don’t have any cold air then check your thermostat. It may be set too high. Your thermostat tells the unit what temperature you want the room to be, effectively telling it when to turn on and off to maintain this temperature.

If the thermostat is set too high then it won’t tell the AC unit to come on.

Turn the thermostat down and you should hear a click, the system should then start working. If it doesn’t you may have an issue with the thermostat and need to replace it.

Clogged Filters

Your Ac system has at least one filter, possibly more. These allow air through but they also capture all the debris that you don’t want floating around your home. Because they trap debris the filters will slowly become clogged, reducing the airflow and ultimately preventing it altogether.

You need to check and clean or replace the filters regularly to avoid this being n issue.


If your AC unit develops a leak then it may be allowing refrigerant to escape. Your refrigerant is essential, it absorbs heat from the air, allowing the machine to blow cold air into your home. A leak reduces the ability to absorb heat and the problem will get worse the lower the level of refrigerant.

However, this substance can be dangerous. While you may be able to identify the issue, only a qualified professional will be able to fix the leak and refill your system.

A technician will also be able to assess your evaporator coil and condenser to see if they have developed any faults. If they have you are likely to have reduced airflow

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