Equipment has a refrigerant leak as well as undersized return, making equipment inefficient as well as unreliable. I gave customer estimate to replace 4 ton horizontal equipment which will allow room for extra return as well as return and supply plenum. There a 3 return boxes (2) 12x24 boxes and (1) 14x14 return box in master bedroom. There is currently an upflow 90 percent furnace we will convert into a 80 percent horizontal furnace will change pvc flue pipe to metal flue pipe . We will attach to existing ductwork as well as copper refrigerant lines and dispose of old equipment also will include code upgrades..