No, but the price has gone through the roof. It is very expensive to add freon to an AC today. I had problems with mine and finally ended up having to replace the unit and that was really expensive.
Central vacuum systems are run by electricity. They were popular in the more 'elite' homes in the seventies and over the years have phased out. It is very rare to find a new home with a central vacuum.
You do not want it to run on low freon as it will burn itself up. There is a low pressue switch that tells it not to run if the freon pressure is below a certain point. To make it run; add freon.
It holds 1.32 lbs (or 21 oz) of 134a Refrigerant - when totally empty. The Denso A/C compressor holds 3 oz of PAG oil when drained off the car. Freon was the Dupont name for old Freon 12 (phased out back in 1982) and that refrigerant requires a license to buy today. So most people retro fit those older pre 1982 cars to run the new 134a.
No, Freon is a "Refrigerant". It is compressed and then run through a heat exchanger where it expands and absorbs heat from the air that is being blown into the car. Coolant (Ethylene Glycol) only carries heat from one place (the engine) to another (The radiator).
Probably low on freon.
yes
It should not run with no freon. There is a low pressure switch to keep that from happening.
It depends on the size of the coils and length of the lines. A car uses 2 lbs on average, so when you look at the size of a house and the length the lines have to run 5-10 is possible.
Freon can leak. Since it will do so in the form of an invisible, odorless gas, it is very difficult to observe such a leak.
Look to see if the compressor is running when the ac is on. If not, then check the Freon pressure, as the compressor won't run if the Freon is low.
it will break the unit
A leak, either the pressure line or somewhere in the compressor.