A standardized curtain wall unit is disclosed which is intended for use with any required number of other similar curtain wall units to provide a unit type curtain wall assembly capable of room temperature control. The curtain wall unit comprises a plurality of frame members joined into a rectangular shape, defining openings which are closed by double glazing or like panels or panes. All the frame members are of identical cross-sectional shape, with a passageway for a heat transfer fluid and a mounting recess formed longitudinally therethrough in side-by- side relation to each other. The fluid passageway is disposed inwardly of the mounting recess, or closer to the middle of the curtain wall unit, and the mounting recess is open outwardly. This cross- sectional shape of the frame members offers several advantages in constructing the unit type curtain wall assembly from a plurality of such curtain wall units and auxiliary parts such as seals, couplings, and piping.
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