re auto air conditioning without freon in article apr convex com tobias convex com allen tobias writes better still years ago they demonstrated a cold air system which only used air it was called a rovax the unit worked very well the short coming was the seal technology where is it today actually the company and the product was rovac which stood for rotary air conditioning it used a rotary compressor with what was effectively an air air heat exchanger and worked pretty well the negatives were mostly that it was about less efficient than using freon and noise problems from the high velocity pressure air all of which were solved by the time the company went bankrupt it is still a legal entity in florida but i believe completely dead and there s a heck of an opurtunity to buy up it s patents and restart the operation alan l peterman hm work al qiclab scn rain com it s odd how as i get older the days are longer but the years are shorter
