Never! If it's low on refrigerant it has leaked.
Freon does not generally need to be replaced. However over time, systems sometimes have a small leak and need to have coolant added. A Freon gauge can confirm if you need to have Freon added.
There is no freon in a home sprinkler system.
Never, an air conditioner is a closed system. If you need to add refrigerant you have a leak that needs to be repaired. In theory you should never have to add freon. but there can be some residual loss. maybe after five to ten years.
Periodically check your freon levels. For most of us, that is once a year unless the air conditioner is not consistently blowing cool air. Freon is no longer available to uncertified people, and newer cars use another type of coolant.
5yrs
As often as its needed to get the room set to your set tempature.
Your car uses refrigerant not Freon. Freon is a brand name put out by DuPont. All ac systems use refrigerant often mistakenly called Freon. All of them!!! Check for a decal under the hood or on the compressor for the information you seek. I believe that around 1996 car makers started using R-134A instead of R-12 refrigerant. Hope this helps.
Often when a vehicle air conditioner gets loud, the problem is due to a belt. You should take the car in to have the belt checked.
No need to.
it should have a plate on the inside where a convenient cover could be removed as well as your local camper sales place should be able to recharge it or point you in right direction to get ur done
The amount of time you run the air conditioner depends on how often you should change the filter. Generally you should change the filter at least once every 5-6 months of use.