Solarium

Noun

 * 1) A room, with many windows, exposed to the sun
 * 2) A room with sunbeds in it.
 * 3) An establishment where one can rent sunbeds.

Thesaurus
best room, drawing room, foreroom, front room, gallery, lanai, living room, parlor, patio, piazza, porch, salon, saloon, sitting room, sleeping porch, stoop, sun parlor, sun porch, sunroom, veranda