We had a unit for years, it was recently replaced when I was about to graduate from high school.
I heard my mum say that the unit had been serving us for years, dad interjected and confirmed that it had been approximately twenty years since the air conditioning installation was done.
The HVAC unit had served us well as I only saw the air conditioning technicians once a year or sometimes twice when we were on spring break or during fall. There was a dial thermostat mounted on the wall in the corridor. This was a specific placement as the regulator is not meant to be situated somewhere where there is direct sunlight as it will give improper readings. The unit had come to the end of the road. Its years had been spent. My dad had ordered a new air conditioning from the air conditioning supplier at the local business and dad was excited as he had received a discount for being one of the 100 customers to purchase the all-new ductless multi-split. The ac workman was impressed with the condition of the old unit as though it was old, it looked new because my parents had adhered to the regular a/c service that is required to enhance the function of any unit. The experts had just come from installing another commercial air conditioning system in the new commercial building in town. Since they knew more about air conditioning, the experts advised that we continue scheduling regular air conditioning maintenance to enhance the function of the unit and reduce the repairs. After all, this was done, I asked the specialist why they were not changing the regulator to which he answered that the regulator was still functioning and there would be no need to change it.