Gas used in air conditioners are: R12 freon is dichlorodifluoromethane R134a is Tetrafluoroethane
freon?
Freon gas is used in refrigerators, air conditioners, ovens and all other types of these things.
Yes you need freon if you own a heatpump, with a furnace/oil burner you could do without the freon.
Yes but you will probably have to install a service port.
Window and wall units
Try chraging it with Freon. This is the most common problem.
Air conditioners manufactured between 1970 and 2010 use Freon as a coolant. Freon is scheduled to be phased out of usage by 2020. Newer air conditioner models use a different type of coolant.
If you mean freeze as in ice up it is probably low on freon.
Depends on the size of the unit and how bit or small the compressor is. There will be labels that will tell the technician how many pounds to capacity for Freon.
Actually no technical skills needed to check the Freon level. Home central air conditioners have a Freon scale on it. One just need to read the scale and determine whether the level of Freon is sufficient.
Usually the manner in which the unit vents. Window air conditioners are contained in a case that has vent holes on the top and side while wall air conditioners are vented in the rear.