Homeowner had us out today because his system is not cooling properly. Upon arrival, homeowner informed us that the system has not worked properly in over a year and he’s noticed that his power bill has tripled. We set both thermostats to cooling and noticed that he was stuck in emergency heating even without a call for heating. We reset zone board and went out to check refrigerant pressure on the outdoor unit. We noticed that the system is low on refrigerant. We pumped down the condenser and perform a quick leak search in which there was no leak. Homeowner informed us that the system has never worked since they have lived here in since 2018. Homeowner approval to have 3 pounds of refrigerant added to system and replace zone board.