How to make old aircon look new??

[RoxyRider 0]

Hi there, we are moving into our new condo soon and though it's 13 years old, all the infrastructure, renovation and maintenance inside the home looks really beautiful and new. Only problem is the aircon units looking very old and yellow from the outside, while they are still working fine! Is there any way to refurbish them instead of changing a whole new aircon unit which is very costly? We have 8 aircon units there and would cost a leg if we change them all brand new! Thanks 

[Viviolive 0]

I have exactly the same question in mind. would love to see some good advice~

[GMC 12]

You should be more concern about the refrigerant piping. Tends to leak after 10 to 12 years.