“Is it necessary to vent to the outside? If so is there portable air conditioners that need no venting to outside.”
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You need to move the warm air outside, so yes venting is necessary. The long answer is that there is a compressor generating heat inside the unit. It generates at least as much heat as you remove when you cool the air. The net effect would be no change in room temperature, maybe even an increase if not vented outdoors. There are evaporative coolers that use water or ice for cooling and would not need to be vented. They are generally inexpensive because they do not require a compressor or refrigerant. I'm not very familiar with these style units but would speculate that you would have limited cooling ability from a portable unit. In addition the water or ice would have to be renewed periodically.
Sorry, there was a problem. Please try again later.Unfortunately, all air conditioners, whether central, portable, or in-window, all require outside venting of some sort. This is because they normally have compressors which expell a lot of heat. Not only is the air very hot but it also tends to be humid so a person definitely would not want this air being vented inside the house. Thus, it would totally defeat the purpose of having a/c in the first place. There are "evaporative" cooling systems which do not require venting but these are not nearly as effective at cooling, particularly when things get really really hot.
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