Give the approximate U-value of:

(a) an IGU with low-emissivity glass and dry air space
(b) an IGU with clear sheets of glass and argon-filled space
(c) an IGU with clear sheets of glass, low-E coating and argon-filled space

What will be an ideal response?


(a) an IGU with low-emissivity glass and dry air space 0.33
(b) an IGU with clear sheets of glass and argon-filled space 0.28
(c) an IGU with clear sheets of glass, low-E coating and argon-filled space 0.22

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