Asking the dealer for any good will, will not change anything. I have used several different Honda dealer, even abroad as the prices for car servicing are stupid high in denmark. In sweden 30 km away, they are more or less half price. So what I have saved on service, I guess is what I have to spend now.
Regarding using the aircon regularly, I do have it on normally, also during wintertime.
I will ask another garage for a second opinion, because even with the aircon off do I hear a noise from the engine, which shouldn't be there...