Longbob - I am feeding 12 tons of cooling.
Two things to consider in addition to the acquisition cost is panel upgrades, auto cutover switches, and they like to calculate installation cost based on sizing. It takes them just as much time to install a 12kw as a 24kw, but the typical install cost is twice as much for a 24kw.
I had a contractor pour the slab, I purchased the Kohler from the local dealer and had my electrician do the hookup. The dealer came back to "test" the system. But I saved $3,500 on the turnkey price. It's a little bit of a racket...
