I am wanting to get some ideas from others in the industry about this situation. I am in sales for an HVAC company and I recently lost a job to another company that is going to try and flush out the existing old r22 coil and lineset and put in an R410A condenser. My company would never use an R22 lineset for an R410A system, but I am baffled that he is trying to use the R22 coil. The customer was trying to get me to do it but I told him I would let the other guy ruin his system. Has anyone else heard of doing this? If so, do you have any documentation that would support it or condemn it?