[pushkins]

Did you not say that this unit is new ? New should mean there is a warranty.

If that is the case, it at worst will be due a "service call" in a year and that shouldn't even come close to $500. Most HVAC companies will offer a service call/general maintenance call for around $100.
As for a "chemical cleaning of the coils" on a new, a newish unit or even an older unit, it would be the first I've seen.
Most AC units are installed and forgotten (maintenance wise) for years and seldom have problems, your "blower" is part of your heating/furnace system and will be serviced with any furnace service agreement you might have.
I've had my HVAC guy install a great many HVAC systems over the years and never have we had the need to chemical clean anything, new or old.