The price of R - 22 increased from approximately $7 per pound to nearly $13 per pound as recently as in 2012 .
The cost of R - 22 used to be cheap -- less than $1 per pound in the early 1990s .
The price of R - 22 increased from approximately $7 per pound to nearly $13 per pound as recently as in 2012 .
The cost of R - 22 used to be cheap -- less than $1 per pound in the early 1990s .