I have been thinking of using R416A because it's a little cheaper than R414b.

Can someone post a comparison of the two, indicating pressure temperature relationships of each, btu/hr/lb efficiencies, advantages/disadvantages of each, oil requirements, etc?

I'm tired of paying HIGH prices for R414b and want to switch to something cheaper - maybe even 401a or 401b if either are compatable with mineral oil and AB oil.

There are beginning to be just too many refrigerants to choose from and it's getting confusing. Which one does what, do I change to oil to what or not, do I have to add a heat exchanger or not, etc.......