Is your AC or heat pump unit broken?
If you are having problems with your heating and cooling system just contact one of the York HVAC distributors in your area. They always carry top quality air conditioning and heating parts. Most certified dealers not only carry their very own name brand parts but they usually carry the top rated heating and air parts as well.
Now, you do not have to buy brand new parts for your system if you do not want to. You will be able to find a wide variety of used parts as well in the supply house. Depending on what is wrong with your system really depends on if a used part is the way to go. Many times you do need to buy a brand new part to fully fix the problem.
An easy way to figure out whether or not you need a used or new part is to schedule a service call with one of your local AC contractors. They will be able to advise you on what the proper steps are that you should take. Often times the contractor will install the part for you for a small fee. I personally feel hiring a contractor is the best way to go.