Either we need to get more awareness of how dumb single-hose portable air conditioning units are, or we need to just use window units whenever possible. While we know that there are times a portable unit is the only option, it seems that only very high capacity, premium machines have the facility to use two hoses. The efficiency of these portable units when measured in actual BTU’s of cooling per kWh of electricity is horrendous compared to even a window unit. Think something like 1/2 the efficiency of a lowly window unit.
Portable Air Conditioners, Why You shouldn’t Like Them