I realize we're probably all thinking about heating right now, so thank you for reading this ;) I am putting in a new furnace, so I figured I would save if I did the A/C now, too. I haven't been able to get an HVAC company to do a ManualJ to give me the right size units. I am prob. going with a 2 stage furnace, so they said it doesn't matter, anyway. The Q. is with the A/C side. I think I had a 2.5ton unit originally. My compressor died and it was replaced with a 3 ton unit. Now the HVAC guy says the copper I have is for 2.5 ton. But he says I should stay with a 3 ton and will need new copper. Problem is, he wants to run the new copper on the outside of the house. I think it will look horrible and I don't want to do that. [B]Q1. [/B]Is there some reason they will not put the new copper where the old copper is? [B]Q2.[/B] So what is the difference in a 2.5 or 3 ton unit? I.E. would I probably be OK with either size? Because if I don't want the new copper running up my house (to the attic), he said I [I]could [/I]go back to the 2.5ton, but he thinks I need the 3 ton for this climate. I really don't remember a significant operating difference with either unit. 1800sf 2 story house in NC. Finally, this is a last minute decision to do the A/c now, so I really don't know what I should consider when selecting a new unit. [B]Q. [/B]Tips? thank you :)

I want to replace an old Lennox 36G6901 thermostat with a Trane Taystat570 Unfortunately the terminals are not coded the same. Could anybody help please and tell me which wire goes to which terminal on the Trane? Lennox Layout: ----- Trane Y Blu wire ----- G wire color? R Black wire ----- B wire color? F Green wire ----- R wire color? M Red wire ----- Y wire color? L Black wire ----- F wire color? A Pink wire ----- W wire color? Y Orange wire ---- X2 wire color X Yellow wire ---- O wire color? AGAIN, I WILL APPRECIATE ANY HELP ANYONE IS WILLING TO GIVE ME. THANKS