Recently, I had a repair guy replace the gas valve on my Trane 2 stage, variable speed furnace. While he was there, he checked the wiring at the thermostat and said that the AC side was wired "funny". While he did not change the AC wiring, he did fix the original problem (bad gas valve), so I'm happy to have heat again (just in time!). However, that got me wondering if system is wired correctly for the installed equipment. I remember that the original installer fired the technician in the middle of the job and found a new guy. Below is my setup. [B]Equipment:[/B] [COLOR="#0000FF"] Thermostat[/COLOR]: Trane XT 302C This stat may be programmed for 1 or 2 stage heating, 1 or 2 stage cooling, or heat pump. ==> [U]It IS programmed for 2 stage heat and 1 stage cooling[/U]. [COLOR="#0000FF"]Furnace[/COLOR]: Train XV 80 (Variable Speed, 2-Stage Gas Furnace) Model: TUD080R9V34H6 [COLOR="#0000FF"]Coils[/COLOR]: Trane, Model: TXC036S3HPC0 [COLOR="#0000FF"]Condenser[/COLOR]: Trane XL 1400, Model: TTY036B100A0 [B]Wiring (AC side)[/B] [COLOR="#0000FF"]At the Thermostat terminals:[/COLOR] Y1 - Yellow wire Y2 - Jumpered to Y1 Orange wire present but is NOT connected to anything [COLOR="#0000FF"]At the Furnace controller terminals:[/COLOR] Y1 - Yellow wire from Stat Y1 - Yellow wire from Condenser Y2 - Orange wire from Stat (note that it is NOT connected at the stat) Y2 - Orange wire from condenser [COLOR="#0000FF"] At the outdoor Condenser:[/COLOR] I did not check these wires [B]Questions[/B] 1) Do I have a 2 stage AC system or a single stage AC system? 2) If its a 2 stage AC, will I find a Y1 & Y2 terminal on the outdoor condenser? 3) If its a 2 stage, should I: A) Removed the jumper at the stat B) Connect the Y1 terminals on all equipment together C) Connect the Y2 terminals on all equipment together D) Program the stat for 2 stage cooling [B][COLOR="#FF0000"]4) If its a single stage cooling system, what is the correct wiring at the stat, furnace controller and condenser?[/COLOR][/B] [I][B]Thanks for any help with these questions![/B][/I]

Ive lived in this house since 04 but have no knowledge regarding the age of my current ac unit. A couple of years ago, repair guy loaded me up with freon. Recently I had to call them back again and this time he searched for leaks, claimed there wasnt one then filled me up again. Ive run the AC maybe a total of two weeks or so since then and its already out (assuming that is the problem, but whatever it is, its back) At the time of the last visit, I was told if they have to come back fairly soon, that would indicate Id likely need an entire new setup, inside and out because if theres no leaks then the equipment is just old and needs to be replaced. That isnt verbatim, but thats the gist of the conversation, at least how I interpreted it. Prices were tossed around 5k to 8k and what Ive been told upon asking around is that it shouldnt be quite that much. Maybe 4-5k. From the brief investigating Ive done, it appears it is a very complex process in figuring out what size unit you need, hence the cost flexibility. Aside from that, are there any basic tips I can get that might help me notice red flags and avoid being taken advantage of in this situation? My first question, which I know if I ask the repair man he will say yes, but will I have to replace both the inside and outside components no matter what? And I realize Ive given vague information as to the problem, but its the best I can do. Secondly, Is there any thing I can check myself to confirm what I am being told? If there's any helpful info out there, Id appreciate it. Thanks