Just had a guy install a new 1.5 Ton Goodman R410 scroll condenser and A-coil in my duplex. A-coil has orifice (no TXV). I watched the guy install it and he did a fantasic job. Pulled a vacuum, checked for leaks, then set the superheat. When he was all done he said "Ok, your new 2.5 ton AC unit is working perfectly". When I told him it was a 1.5 ton unit, he got the deer in the headlights look for a few moments and then said "no big deal. It'll be just fine". I checked the furnace and it is set up for 1000 CFM air flow. A week later another guy showed up and installed another similar system in the other half of the duplex. When I asked him if he would fix the other system that was set up wrong earlier, he also said that it would be OK. Is the first system going to last or just work itself to death trying to cool 1000 CFM of air? If I just set the furnace fan speed to 600 CFM will this screw up the superheat?