Tunable Lippmann holowindows have been developed based on the application of broadband Lippmann holograms and dichromated gelatin material. These holograms can be fabricated to have high reflectivity (above 99%) in any part of the near-UV, visible or near-IR. In particular, they can reflect all direct solar heat radiation and also the near-UV portion of the solar spectrum that cannot be easily blocked by conventional glass or acrylics. Furthermore, these holowindows can be combined with conductive adhesives to create ideal cooling mirrors, with performance parameters much superior than those of existing products. As a result, they can create a new generation of high efficiency solar heat control windows with rejection of selected portions of the solar spectrum, while still preserving high visible transmission (up to 87% for single glazing) and the near-perfect (close to 100%) reflection of IR direct solar components. In the case of tunable Lippmann holowindows, it is also possible to adjust independently the U- value , emittance and shading coefficient by the number of glazings, conductive adhesive thickness and hologram reflection, respectively. As a result, this holographic technology introduces to heat mirror engineering a new degree of freedom — selective near-IR reflection.