When you live in Florida, your air conditioner is a lifeline. Not only do you need it to feel comfortable inside your home, it should also improve air quality.
So if you get home from a long day at work, only to find that your precious machine is blowing warm air, it’s understandably cause for concern.
When it’s the dog days of summer the last thing you want your AC to do is to blow hot air instead of cold air.
If this is happening to you, you’re probably desperate to fix this problem immediately. But to fix the problem, you need to know the cause of the problem.
9 Reasons Your AC is Blowing Warm Air
There are several reasons why an air conditioner is blowing warm or hot air. Some can be easily fixed at home, while others are more serious and require the help of an HVAC professional.
Here are nine of the most likely reasons your AC is blowing warm air.
1. Wrong Thermostat Setting
It may sound silly, but it’s pretty common for the thermostat to be set to “heat”. Check to make sure that’s not the case with your thermostat.
If it’s set to cool, as you want it to be, make sure it’s also set to “auto” instead of “on”. When it’s set to “auto”, the system cools your home to the temperature you selected. When it’s “on”, the system just keeps blowing cool air.
2. Condenser Unit Problems
Your condenser unit is the equipment that’s outside your home. Since it’s outside, there are several things that could cause issues.
Make sure there’s nothing visibly blocking or affecting the system like dirt, leaves, tall grass, debris, or something else. If there is something blocking the system, remove the item(s).
If something is wrong with the unit, you’ll hear strange sounds come from it. Listen for odd sounds coming from your AC unit.
3. Clogged Air Filter
It’s easy to forget to clean or replace your air filter. But this small piece of equipment can cause big trouble if it’s dirty.
The air filter protects your AC from dust, dirt, debris and other things that can damage your system or reduce airflow and quality.
If your air filters are diry, the caked dust and debris can block the airflow. This, in turn, causes condensation from the humidity inside your home to freeze inside the air conditioner. So your unit is running, but the cold air is blocked.
That’s why it’s so important to regularly replace your air filter every few months. In the summer, replace it every one to two months, especially in hot climates like Florida.
4. Refrigerant Leak
Refrigerant gets compressed, dropping to a low temperature when air conditioning starts. The air supply travels over cool evaporator coils and then escapes through vents to cool your home.
When there are issues with refrigerant, it may mean your AC system pumps hot air instead of cool air.
Refrigerant flows through a closed-circuit tube and fills evaporator coils, meaning air conditioners only need to replace its refrigerant if there’s a leak.
A refrigerant leak is an issue that requires immediate emergency assistance from a certified HVAC technician. This is because extended exposure to this gas can lead to poisoning.
If you think you may have a refrigerant leak, in addition to warm air, you’ll notice:
- Frost forming on the condenser unit (the big box outside your home)
- Your home will feel humid inside
- A hissing sound.
Since refrigerant is dangerous, it’s best to contact your local HVAC technician to fix the problem.
5. Dirty Evaporator Coils
If the evaporator coils we mentioned above are covered in dirt or dust, they can’t remove as much heat from the air as they normally can. This leads to the air coming from your vents feeling warm instead of cool.
You can prevent this from happening by regularly cleaning and replacing your air filters. New, clean air filters catch the dirt and dust that can cause issues with the evaporator coils.
See how it’s all connected?
Evaporator coils can be tricky to get to and fix, so we suggest contacting your local HVAC technician.
6. Leaky Air Ducts
Air ducts deliver air throughout your home. They’re typically hidden in walls, in the attic, or in your basement.
Sometimes they leak, which can lead to hot air entering the ducts and dispersing into your home.
Since ducts are typically located in areas that are hard to access, we recommend contacting your local HVAC technician to fix this problem.
7. Clogged Condensate Line
This is the pipe that filtrates condensation from the humid air inside your home outside your house. Since it’s an enclosed, wet area, it is prone to accumulating algae, sludge, and mildew. You can prevent this by scheduling routine HVAC maintenance.
8. Faulty Compressor
Refrigerant only works when the compressor transforms it from low-pressure refrigerant into a high-pressure, high-temperature gas. When the compressor is not working properly, your air conditioner will make rattling sounds and blow warm air.
9. It’s Time to Replace Your AC System
The average lifespan of an air conditioner unit is 15 to 20 years. Since five years is a significant window, you can do things such as replace your air filters regularly and have routine maintenance checks to make it last towards the higher end of that range.
Contact Colman Heating & Air Conditioning Today for AC Service Repair
When you have your system set to cool, you want cool air to fill your home, not hot air. If you find your system blowing hot air when it’s not supposed to, we can help.
At Coleman, we understand that sometimes, AC issues happen during the most inconvenient times. This is why we have a 24/7 AC emergency line. Call us if you need assistance ASAP or to schedule routine HVAC maintenance to prevent issues during the summer.
Call Colman Heating & Air Conditioning at (321) 360-7566 or schedule an appointment online.