I need to replace my thermostat which is currently a Honeywell CT3461 which is single stage but the company that installed it said they hooked it up to run dual stage. So now I'm looking at buying the Honeywell RTH6400 or the Honeywell RTh7500 model. My question is can the 6400 model run in dual stage, or should I buy the 7500 which according to the stats can run in dual stage? My wiring right now is follows: 1 wire on each G- blue Rc-black R-red W-white Y-orange I like the 6400 stat better but not sure if it will work, any advice on which one will work? I have a Lennox G61V furnace and and 16 seer AC.

Hey! My 5 YO Goodman 1.5T Compressor died and the dealer that installed it ordered a replacement compressor under the warranty. The new compressor is in and now they are telling me it will be $600 to $800 to install it in the existing condenser and re-charge the system. They are quoting 5 hr labor at $90/hr plus the refrigerant cost and misc parts. Does this sound reasonable as a "warranty" replacement? Thanks for any input.