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Why is my house AC blowing hot air?

7 Answers

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Reasons Your Air Conditioner Is Blowing Warm Air (& How to Fix It):

There could be a few different reasons that your air conditioner is blowing warm air instead of dispersing the cool air that you’ve been craving. Resolving a few of these issues will require the assistance of a certified HVAC professional, but you may be able to fix one or two of these problems on your own!

Your Thermostat Is Set Incorrectly:

We know, it might sound silly—but it would be even sillier to pay an air conditioner repair technician to come to your home just to change your thermostat settings!

The first thing you want to check is that your thermostat isn’t set to “heat.” You could have bumped the switch accidentally with your purse or briefcase, one of your children could have played around with it, or any other number of accidents could have caused this to happen. But believe us, it happens! Make sure your thermostat is set to “cool” if you want your air conditioner to blow cool air.

The second thing to check is that your thermostat’s fan settings aren’t set to “on.” While that might sound like what you want on a hot day, it’s actually not! If your fan is set to “on,” it will blow air through your vents whether your system is actively cooling your home or not—meaning it will blow out warm air when your air conditioner is taking a break. You want your thermostat’s fan settings to be switched to “auto” for it to only blow out cool air.

If your thermostat is already set to “cool” and its fan is set to “auto,” then you may be experiencing one of the following issues.

Your Outdoor Unit Lost Power:

Your air conditioning system is made up of an indoor unit (which blows air through your home) and an outdoor unit (which cools the air down). So, if your indoor unit is blowing warm air throughout your house, it could be because the outdoor unit doesn’t have power and can’t cool the air down.

Typically, if this is the case, either your circuit breaker tripped or you’ve blown a fuse. If you check your circuit breaker or fuse panel and you see that the circuit isn’t providing power to your outdoor unit, you’ve found the problem! Unfortunately, this issue will need to be resolved as a professional. You can call the team at Air Experts or schedule an appointment, and they’ll work to solve the problem and get your air conditioner back in working order as quickly as possible.

You’re Low on Refrigerant:

If your air conditioner is blowing out warm air, your unit’s refrigerant levels might be low. This usually indicates a refrigerant leak in your system! If that’s the case, your air conditioner will continue to run and blow out warm air, trying to reach the temperature you set on your thermostat.

Your best bet will be to contact our team at Air Experts to come in and figure out where the refrigerant leak is in your system so we can repair it and get your system up and running again. We’ll fix the leak, restore your refrigerant levels, and leave you 100% satisfied with the solution—guaranteed!

Your Evaporator Coils Are Dirty:

Your evaporator coils are a crucial component of your air conditioner’s functionality, and it’s hugely important to keep them clean so they can work to keep your unit running properly to cool your home. So, if you forgot to schedule your annual air conditioner tune-up, there’s a chance that your evaporator coil is coated in dirt or debris, which can inhibit it from blowing cool air.

To resolve this issue, all you have to do is schedule air conditioner maintenance to get your system tuned up, cleaned up, and ready to cool down your home.
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Your house AC may be blowing hot air due to issues such as low refrigerant levels, a dirty air filter, a faulty compressor, or a malfunctioning thermostat.
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If your air conditioner is blowing out warm air , your units refrigerant level might be low. This usually Indicate a refrigerant Leak in your system. 
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There are several possible reasons why your house AC is blowing hot air. It could be due to a lack of refrigerant, a clogged air filter, or a faulty compressor. It is also possible that the thermostat is not set correctly. It is best to have a professional inspect your AC system to determine the cause of the issue.
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If your AC is blowing hot air, the thermostat may have been accidentally set to “heat.” If this is the case, it's easy to fix on your own. Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air again.
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If your air conditioner is blowing out warm air, your unit's refrigerant levels might be low. This usually indicates a refrigerant leak in your system! If that's the case, your air conditioner will continue to run and blow out warm air, trying to reach the temperature you set on your thermostat.
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Several factors could cause your house AC to blow hot air:

1. **Thermostat settings:** Check the thermostat settings to ensure that the system is set to "cool" mode and that the temperature is set lower than the current room temperature. If the thermostat is set incorrectly, it could cause the AC to blow hot air.

2. **Dirty air filter:** A clogged or dirty air filter can restrict airflow, reduce cooling efficiency, and cause the AC to blow warm air. Check the air filter and replace it if it's dirty or clogged.

3. **Refrigerant leak:** Low refrigerant levels due to a leak in the refrigerant lines can cause the AC to blow warm air. If you suspect a refrigerant leak, it's essential to contact a professional HVAC technician for inspection and repair.

4. **Faulty compressor:** The compressor is responsible for circulating refrigerant and cooling the air. If the compressor is malfunctioning or not operating correctly, it can cause the AC to blow warm air. This issue requires professional diagnosis and repair.

5. **Dirty condenser coils:** Dirty condenser coils can restrict airflow and hinder the heat exchange process, leading to reduced cooling efficiency and warm air blowing from the AC vents. Cleaning the condenser coils may resolve the issue.

6. **Electrical issues:** Electrical problems such as faulty wiring, tripped breakers, or malfunctioning components within the AC unit can cause the system to malfunction and blow hot air. A qualified HVAC technician can diagnose and repair electrical issues.

7. **Blocked vents or ductwork:** Blocked or obstructed vents, as well as damaged or leaky ductwork, can impede airflow and prevent cool air from reaching all areas of your home. Ensure that vents are open and unobstruct
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