They are easily transferable from one place to another and give you a chilling sensation in no time.

You are surely enjoying your summer in a comfortable place if you have a portable air conditioner. However, problems come with every machinery. And one of the issues that happen with portable air conditioners is that it is blowing hot air. There can be several reasons behind this.

The first and foremost thing you have to identify why your portable AC is blowing hot air is to fix the issue.

This article will discuss some of the most frequent reasons for your portable AC blowing hot air instead of cool air. Let's get into action!

Reasons For Portable Air Conditioner Blowing Hot Air

Reasons For Portable Air Conditioner Blowing Hot Air

Several different problems could stop your portable air conditioner from functioning properly. There can be various reasons behind your portable AC blowing warm air. Let's look at some of them:

Air Leakage From Vent House

Portable air conditioners use a vent hose or exhaust responsible for pushing hot air outside. Unlike the optional external intake, which is only included in dual-hose portable AC, this hose is a requirement for all portable air conditioners. And when this vent house leaks, your portable AC's cooling sensation may be affected.

If your portable air conditioner is not cooling effectively, a broken exhaust pipe may be the blame. Because of this, heated air may be seeping into the living area.


Inspect the hose for leaks everywhere, especially where it connects to the window and the portable AC. You can purchase a replacement if your vent hose is damaged. Choose the appropriate size when purchasing a new one for your portable AC. Additionally, you can utilize a window kit to make the hose attachment to the window easy. It makes the fixture incredibly easy and uncomplicated.

Incorrect AC Mode

Check the settings on your portable air conditioner's control panel, either on top or side. Your portable air conditioner may produce heated air due to incorrect control panel settings. This is also possible with smart portable air conditioners using a smartphone's wireless app. To be confident you have the correct mode, look at it.

Your portable air conditioner could have numerous modes, such as Eco mode. Basic modes, however, are constant across all devices. Typically, the choices are cool, dry, fan, or dehumidifier. A heater function will also be available in portable air conditioners that support the reverse refrigeration cycle.


Verify that your appliance is operating in cool mode. Additionally, if your portable air conditioner is in dehumidifier condition, it will only function to eliminate humidity from the air in the room. Moreover, make sure the temperature is lower than the outside temperature. Typically, portable air conditioners work to maintain a temperature of about 26°C.

Low Refrigerant In Your Portable AC

Your portable air conditioner is most likely low on refrigerant if it suddenly starts blowing warm air. The level of refrigerant in an automotive air conditioning system decreases with time. Not the case with portable air conditioners. The refrigerant is expected to remain within the AC for the duration of the unit because they are completely sealed.

This suggests that a leak is most likely to blame for a shortage of refrigerant in the portable air conditioner. It would help if you found the leaking before you may recharge the portable AC. There's highly possible a leak in the same location if your portable air conditioner took a hit somewhere or you see a bend there. It might or might not be simple to locate.


After identifying and repairing the leakage, slowly add small amounts of refrigerant to the suction pipe. Ensure that the refrigerant you use is appropriate for your portable air conditioner.

Exhaust Is Blocking Warm Air

The obstruction of warm air at the exhaust is another reason your portable air conditioner might be blowing warm air. Hot air will not be allowed to escape through the exhaust hole if it is blocked or covered.

Whether a solo hose or a pair of hoses, a vent hose is required for portable air conditioning. By definition, vapor compression-based air conditioners that produce hot air must be discarded from the system. Despite being necessary, it is more practical and adaptable in portable ACs to release warm air than in other models.

If the vent hose is partially blocked by warm air, the air that exits the portable will be relatively warmer (not cold enough).


Verify that nothing outside the window is blocking the hose's open end. From inside, check the vent hose of the portable air conditioner for obstructions or solid objects.

Exhaust Is Blocking Warm Air

Thermostat Not Functioning Correctly

The thermostat in a portable air conditioner controls the ideal temperature in the living environment. Your thermostat will ensure that cooling action stops once the temperature you choose in the control panel has been reached.

However, a malfunctioning thermostat will identify the wrong temperatures. It will lead your portable air conditioner to turn off before achieving the required temperature.


Try setting the AC control panel's temperature lower than is necessary. Your portable air conditioner's thermostat could be reading the wrong temperature if it starts blowing cool air. You have two options for the thermostat if this diagnostic for the portable AC is accurate: adjust or change it.

Clogged Portable AC Coils

Condenser coils that are clogged fail to cool the refrigerant they contain adequately. If the coils of your portable AC are blocked, you will experience less coolness from the portable AC.

Condenser coil cleaning is therefore recommended at least every year to ensure the life and functionality of your portable air conditioner. You will save significant money and time if you start this early.


You won't always have the accessibility of the condenser coils on portable air conditioners. However, if it does, you can clean them with a gentle brush by moving them all over them because the condenser coils are so delicate and clean. The effectiveness of portable air conditioners will be harmed if the condenser coils are physically damaged.


A portable air conditioner is a great machine that can make your summer easy and comfy. And if it can't provide you with cool air, it is of no use. As mentioned above, many factors are causing your AC to blow hot air.

Hopefully, you can now identify and, in some circumstances, even resolve the problem with the air conditioner spewing hot air.

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