A/C services are just expensive, i have had enough of the b.s. regarding to the A/C services...

well last year, i had to replace the evacuator, some hoses and little bitty thinggy from the honda dealer, and after 8months later the a/c failed to work again.
i took it to the dealer and they were like "our tech couldn't find anything, the very last place to check is the a/c evacuator, since it's hiding behind the glove box and can't check the leak unless you take it out, so i was like, "yeah take it out and check it!" then they couldn't find anything wrong with it.

now everything put back together with 2lbs of freon gas and we are still troubleshooting if there is any leaks or not.
if in case, the freon doesn't leak anymore, that means the honda tech didn't install the evacuator right at the first time.

anyways, my story is leaning to the OT, but yeah the best way to find out is just have the tech to check it out. and you know all parts and labor done at dealer come with 1yr & 12000miles warranty.

good luck!