It sounds reasonable, maybe a little high depending on your area. But have a question. R22 has been phased out. Is this system still going to use the old R22? (there is still some around) Probably if you are keeping the interior unit. In the long run it may be better to upgrade to the new stuff. It depends on your/his money situation. I think they have a substitute for R22. Not sure how well it works. Just something to think about.