I was quoted a 2.5 ton system using a bryant 165a preferred condenser and bryant fe4 air handler. Today they showed up to put it in and had a carrier fv4b air handler. I was never getting an evolution tstat so does it make a big difference? The reason im concerned is because it looks like I wont be at the 2.5 ton system size and I won't get the tax incentive with the equipment they brought unless I allow them to downsize the system. It will only be at 23600 btus. I would be at the 2.5 ton with the fe4 unit and from what I can tell from online that FE4 unit does qualify for the incentive when pairs with the proper 165a condenser. I am thinking that the FE4 costs more than the FV4B and they may be trying to increase their profit. I was told that the carrier is the one that matches up for the incentive but I looked online and it does not appear to be the case for the 2.5 ton system. It would have to be the FV4BNF005 not the FV4BNF003 I was brought. Am I missing something? I don't want the system to be too small just to get the tax incentive either.