A greenhouse using tinted windows has to be a bad idea. They use a special grade of glass for greenhouses that lets in a broader spectrum of light than
regular window glass.
I don't like the tinted energy-saving windows they sell as standard up here at the 48th parallel, where you want to let the sun in most of the year. My bus heats up quite nice with a bit of sun coming through its untinted windows, and is comfortable up to the mid-80's. Tinted windows are (probably) a wiser choice in hotter (and/or more humid) environments, IDK. I guess you got to build for where you park, (and sorry about the thread hi-jack).