Do you know which parts are best for your AC unit?
There are many companies that produce air conditioning parts but I believe that York AC parts are the best on the market today. From my personal experience, all of York HVAC parts hold up the best. I have been using them for over 10 years and each time they have performed the best and lasted the longest. My personal advice is to just go ahead and have a York unit installed in your home and you will save yourself a lot of time and money.
Now, there are other companies that do provide great heating and cooling units as well as parts. It really depends on where you live and what you are looking for out of your heating and air unit. If you live somewhere with a lot of salt in the air then York might be your best bet. If you live in the mountains with a lot of cold air other options could work best for you.