High-performance windows may make it
possible to move heating outlets further from
windows to eliminate ducting or piping A recent glazing development is switchable
glazing. These can vary their optical or solar
properties according to light (photochromic),
heat (thermochromic) or electric current
(electrochromic). Initial computer simulations
show that electro chromic glazing has the
most promise for improving comfort. These
are prototype systems. They will likely be
able to reduce cooling loads and glare and
improve visual comfort if high solar
transmittance is not needed. Switchable
glazings may have poorer optical properties
and not be suitable in residential buildings.