I understand we will need seven air conditioning units on the two floors.That ' s what you think , yes ?   Yes . You could use five or six units.But five or six wouldn't be very efficient . I recommend seven .   And if we take the Decker units you suggested , what would the price be ?   Let me calculate the price for you . I can give you a 15 % discount if you buy the seven units.Let ' s see here . Your total would be 5929 dollars .   Isn't there any way we can get central air conditioning in this building ?   As I said , it is possible , but it would be much more expensive . I think it would be at least 12000 dollars to do a complete system . 