True. There are ways to use a 2nd exhaust for the portable AC to increase efficiency but not sure if it's worth it. For ~3 weeks per year I wouldn't really care

True. There are ways to use a 2nd exhaust for the portable AC to increase efficiency but not sure if it's worth it. For ~3 weeks per year I wouldn't really care. Also, if ACs are sold with 2 hoses they fall under a different category of ACs and must be somewhat more efficient. That's why those are not sold usually.