Press [Power]. Use the [Up and Down] arrow keys to set the desired temperature. Press the [Mode] key repeatedly until "Cool" mode is selected. If needed, press the [Fan] key on the remote or control panel to adjust fan speeds.

The Air Conditioner Does Not Generate Cold Air First, check the thermostat to ensure it's set to "cool" mode. If it is, the next step is to look at the air filter. A dirty filter can restrict airflow and prevent the unit from cooling properly. The problem may be with the air conditioner if the filter looks clean.

How Long Can a Portable Air Conditioner Run Continuously? Though this answer may come as a surprise, there isn't any limit to how long you can keep your portable air conditioner running, as long as it's connected to a power source.

While portable ACs can be vented through a door, wall, or ceiling, they are most frequently vented through windows. Although it isn't unsafe to run your portable AC without venting, it is counterproductive.