New window technologies are reducing heat transfer through the glazed areas of windows. Low-emissivity (low-E) coatings reduce radiative heat transfer and low-conductivity gas fills (which replace the air between glazing layers) reduce conductive heat transfer. Given these advantages in insulating glass technol ogy. researchers and manufacturers are now beginning to focus their attention on re ducing heat transfer through window edges. Old edge designs are now under scru tiny and new designs are being proposed.
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