I haven't seen that much of an increase this year. I think it's more around 6%.
I've seen increases all around the market. Why? Because gas has tripled in the last few years and if you don't think that affects everything- think twice. Everything we use comes by truck.
The cost of copper has doubled as well. Taxes on refrigerant has doubled and tripled R22.
If you want to get mad, get mad at government and the oil companies. Since no one is screaming bloody murder to those in control of these things- we will have to live with it.