What i am wondering about is when someone installs unauthorized parts in a Trane I am sure the warranty will be void for that component.. but does it void the entire warranty and if said part is in the compressor housing.. does it just void the compressor package or the entire warranty.. My guess is entire warranty including in the airhandler... any thoughts... Here is what happened.. Immediately upon install my compressor package in the garage (split system) developed an internal leak in the water shut off valve.. The techs came out and instead of replacing the valve they opened it up and replaced the guts... now i know that is not proper but i was ok with it and kept my mouth shut since i hated to see a shade tree mechanic take a blow torch and cut out the welded in water SOV to replace it. I have done some soldering myself and i can make it look real bad.. (no leaks but just horrible solder job looks wise) so I was ok with the re-gutting... Yep next day developed same internal leak so they regutted it again.. still ok with that in the hope that it would fix it and not sure why it did not. .but it did not.. so now along comes a totally new 3rd party contractor (supposedly GEO expert) LOL.. and I thought was going to cut the valve out and replace it with the brand spanking new one that I know he can get from Trane... to my surprise when i visited the garage again expecting to see the biggest and worst solder job i have ever seen.. I was amazed.. no factory weld could hold a candle to his soldering.... I was impressed... however that did not last long.. I immediately noticed that there was no new valve.. but a nice shiny 3/4 inch copper pipe welded (beautiful solder job) in place of the valve and extending out the side of the compressor cabinet... (thank god they did not cut new holes) of course it protrudes out the original hole that the water pipe normally leaves.. then it turns 90 degrees and there is where i saw the brand new sparkling Rain Bird shut off valve... so he replaced the 300 dollar water shock reducing shut off valve with a 29.95 Rain Bird from Home Depot... Hey it works great and i no longer have an internal leak and the power turns it on and off as it should.. However i now no longer have a warranty.. Can you imagine me calling Trane a year from now and saying .. "Hey Trane.. get your but out here and replace my RainBird valve its malfuntioning... JEESH! Even funnier what if they had done that to the one inside and when the Rainbird failed and destroyed every carpet in my house you would play hell sueing Trane for a failed part that destroyed your house... So that is the reason for the question.. And this is just one problem i have written over a 200 page report on these 3 companies.. Are we having fun yet..