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 Is it a unit per room? If so, as long as you make sure they calculate well, I’d go slightly higher than theoretical requirements for a large room but mine works fine. It’s just our living room on really hot days could do with a little more juice! 
 Thanks for the input.  He hasnt gone over the specifics with us yet, just mentioned it as an option. 
 Our mistake was simple. We didn’t realise the impact of late afternoon direct sunlight on the windows of the living room. Pretty dumb really but because of restrictions outside, the only fix is drapes and doesn’t really help. We’d have been fine if we simply upped the output of the Aircon. Theoretically there was already margin so I’d consider looking at things like that and asking him to just have a think in that. Do keep in mind, here in Costa Rica direct sun has a very rapid impact. It’s a little stronger than texas