I had one installed last year and all I can say is get the right size one for your house. The one on the right runs almost twice as much as mine. Once you go CAC you will never go back.
My price =
Supply and install one 16 seer Tempstar 3 ton a/c unit with 10 year warranty and 5 year No Hassle warranty. Includes wiring, disconnect, breaker, coil, condenser, line set, low ambient, wall brackets and startup. $3925.00 all tax in. http://www.tempstar.com/products/16ac.html
PM me if you want the contact.