Performed 1 system diagnostic for whole home found 25 year old furnace. Was zoned at one point. Main level thermostat inoperable. Single control for upstairs only, found value pipe to be single wall, pitted and burnt contactor, high head pressure due to dirty condenser, and no water safeties. Dude to age and inefficiency of unit recommend replacing system and rezoning unit. Custimer did not want to continue with any repairs at this time. Stated husbands would do the repairs. But would still like an estimate for replacement and reasoning. Based on our findings today, it might be time to think about getting a brand new system.