I have been taking apple cider vinegar for about 3 months and have seen good results. I have asthma, and it has really helped with my breathing. It has also helped with restless legs, muscle cramps, and has really helped my stomach, and psoriasis.
Freon is the cooling agent used in most air conditioning systems. Every air conditioning system needs a refrigerant (also called a coolant) that actually creates the cool air -- that's the role of Freon. As necessary as Freon is to the optimal performance of your your air conditioner, you do not want to handle a potential Freon problem yourself.
Service air is used in a plant for use with tools and equipment. Instrument air is used to control procces control equipment, such as valves. If you only had the one instrument air system and no service air you could possibly deplete/starve your control instruments and your plant would shut down.