Where can I see a Tromb will in use in Boulder County?
https://www.google.com/search?q=Trombe+Wall&rlz=1C1RNPN_enUS419US419&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj9ns7vusDJAhWBKj4KHX-YArEQ_AUICCgC&biw=1680&bih=891