For that one week of the year its very hot then any kind of air conditioner at all, even one with awful cooling power, is probably enough. If you can get a two-hose unit where the machinery is half the size of the 1-hose, and is proportionally cheaper then you should. But its worth remembering that the consumers know they are buying a piece of cheap junk: they intend to have it fan away at them for a week while they complain about how it never used to get this hot. Three years later there will be another heat wave, and (if they are anything like me) they will not be sure if they still have the air con they bought last time in their attic, or if they lost it in the house move. Or maybe it broke? So their is a very real chance that it is never being used again from 10 days after purchase: and the buyer knows that.
“has greater cooling capacity per dollar”
For that one week of the year its very hot then any kind of air conditioner at all, even one with awful cooling power, is probably enough. If you can get a two-hose unit where the machinery is half the size of the 1-hose, and is proportionally cheaper then you should. But its worth remembering that the consumers know they are buying a piece of cheap junk: they intend to have it fan away at them for a week while they complain about how it never used to get this hot. Three years later there will be another heat wave, and (if they are anything like me) they will not be sure if they still have the air con they bought last time in their attic, or if they lost it in the house move. Or maybe it broke? So their is a very real chance that it is never being used again from 10 days after purchase: and the buyer knows that.