Running a Portable Air Conditioner Without an Exhaust Hose Is Possible

Portable Air Conditioner

Portable A/C’s are units known for their convenience because you can transfer them from room to room. These units are self-contained systems and do not need any permanent installation, but they do need venting.

They often require an exhaust hose so they can vent the hot air out of your room.

Can you run a portable air conditioner without an exhaust hose? Yes, you can run a portable A/C even without the exhaust hose. But you can do it safely only by setting it in dehumidifier mode to heat your room. If you have no windows for the hose, you can use ventless portable A/C’s.

Although you can safely run your portable A/C without an exhaust hose, that does not mean you should. Is it worth it? Learn more as you read through this post.

How Portable A/C’s Work

Much like a window A/C, portable ones cool the room. These also use a refrigerant that soaks up large amounts of heat from an evaporator coil during the vapor phase.

The heat will then travel to the condenser coil and be compressed into a liquid form. This system is used mostly in appliances that need to cool things.

Regardless of the brand and model, it is very much the same when it comes to the cold side of portable A/C’s. The unit will collect the heat and transform it into droplets of water dumped outside your room.

Going to the hot side, this is where the process is a bit different. Central air uses a big condenser coil outside of your home.

It also has a big fan that helps transfer heat from the inside of your home to the outdoors. A/C noises are usually from the compressor and condenser coil. This is why they are placed outside of the house.

The noises are not the same, however. Expensive ones make less noise than cheaper ones on the market. But even if they are a lot less quiet, you still need to place the compressor and fan outside for your safety.

The portable A/C’s need to keep all of the hot-side parts inside the chassis beside your room. The air holding the heat away from the condenser coil needs to go out of the vent hose.

If you want a colder room, do this. If you want a warmer room, do not use the exhaust hose, so the heat will never leave the room.

The Importance of Using Vents

A portable air conditioner aims to cool down a room, but it must absorb heat from the air to achieve this. The hot air inside the room will stay locked up if the A/C device is not vented outside or into another room.

It will not only keep the room from cooling, but it will also make it cooler.

It is also necessary to vent a portable air conditioner because it eliminates moisture from the air. Inside a room, the less moisture, the colder it feels.

If the portable A/C device is not vented, the moisture will begin to build up and neutralize the A/C cooling effect. As you can see, venting is a very significant aspect of keeping cool and retaining an appropriate air conditioner.

Going Ventless

Some stores provide ventless air conditioners to prevent the inconvenience of hoses. They are also called swamp coolers or evaporative coolers, but they are not even air conditioners!

An A/C water tank needs to be drained to drain the water drawn from the air. On the other hand, the water tank in an evaporative cooler must be filled.

In the membrane, the water in the tank is pumped, and then a fan pushes air across the membrane. The water evaporates as the air travels through the wet membrane, removing heat as it does.

The air coming out of the evaporator is also colder than the air that goes in. It is the same theory as perspiration; your body becomes hotter as air passes your skin and your sweat evaporates.

Evaporative coolers do not need ventilation or water hoses and are self-contained. For that reason, they are an alternative for those without hoses that need portable cooling.

In areas with low humidity, however, evaporative coolers work better. An evaporative cooler would become much less powerful with a humidity level of 60% or above.

Evaporative coolers can be almost as effective in less humid conditions as portable air conditioners while consuming less electricity.

Are Ventless Air Conditioners Portable?

As long as you have a spot to plug them in, swamp coolers are portable. But to avoid the possibility of overheating the string, avoid using extension cords.

While some models have fan-only settings to use less power, portable ventless air conditioners are continuously working. They usually use 90 to 160 kWh.

This is smaller than the power usage of 3,500 kWh for window air conditioners, which use about 500 kWh or central air conditioning systems.

Ventless A/C’s are easy to install. Roll the portable ventless air conditioner to the ideal space, plug it in, add water, and instantly feel cooler.

One unit cools one room, and the windows and doors need to be held closed. The temperature difference can be as much as 30 degrees Fahrenheit on a hot day.

How Ventless Portable Air Conditioners Work

In an open tank at the bottom, a ventless portable air conditioner has a pool of vapor. This provides it with a low gravity core, which helps avoid tipping.

Water is pulled from the tank by a fan and pump, dripping it on a cooling surface. It will then be dragging the room air over the pad, which fills it with humidity.

The moistened air feels cleaner and more refreshing than your room’s dry, humid air. In humid and dry climates, a ventless portable air conditioner performs best.

In warmer, humid climates, it does not work well. While the humidified air is cooler on the skin, the room’s air with the swamp cooler becomes more humid.


Most people consider going ventless if they do not have nearby windows for their portable A/C. But there are many venting options you can pursue if you do not have windows for the hose.

You can vent the unit through the floor, the next room, or even through your chimney! As you can see, venting is necessary to make your A/C more efficient and to have comfortable air.

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