Define "older model". Up to the early 90s, they used R-12/CFC-12. Good luck trying to get that anymore. R414B is the recommended replacement for R12 systems.
yes, older units could take between 9 and 15 lbs of freon most take about 12
Compressor ice cream makers use a refrigerant liquid like in a refrigerator or air conditioner. Older units did use freon as the refrigerant, but that is now banned.
On a 2003 model with dual a/c units it will be 1.65 pounds and on a single unit it will be 1.1 pounds..
Depends on the air conditioner. Older units use a form of Freon that is no longer manufactured, and you cannot buy it. Some window type units are sealed, and have no provision to add refrigerant. Your best bet will be to talk with the service staff at a local heating and air conditioning company.
yes
There is no set amount required by different AC units, it may be listed on the mfg. tag on the unit but that is just the factory charge and may be different for lines over 25 feet. The freon in older home units is R-22 and isn't avilable to non licensed people. If your unit needs freon, it leaked out. someone should find the leak and give a quote on fixing it. If you are not licensed, it is illegal to sell you freon for private use. It is best to pay someone to take care of this task and then you will be more certain of having a working air conditioner. They have the training and tools to do a proper job.
actually this is a pet project of mine to produce a Freon-less A/C unit
no, water is used in case of chillers...
all i know is that freon is put into air conditioning units in your car. it's what causes your A/C to be cold
R-22
I believe it is 1.5 units.
yes