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<blockquote data-quote="-Pjackso" data-source="post: 4094085" data-attributes="member: 8119">This is correct.For the window overall U-value - the glass does provide a (very tiny) R-value via conduction, but it&#039;s effectively 0 (as stated).Most of the insulating value of the window comes from the &#039;gaps&#039; between panes.&nbsp; Heat transfer through the gap requires an &#039;air-loop&#039; circulation (convection) of the internal gasses.&nbsp;&nbsp; This slows down the heat-transfer, which increases the R-value of the window.&nbsp; More &#039;gaps&#039; (panes) = slower heat-transfer = improved R-value.&#039;Air&#039; inside the window gaps works fine for insulating purposes - providing the air is DRY.k-values of air: 0.0262 Watts/meter-K.k-values of argon: 0.016 Watts/meter-K.Per the values above, argon transfers about 1/2 less &#039;watts&#039; of heat-transfer per area - but air is a viable gas to use also.Overall heat transfer of windows with different &#039;gasses (air/argon)&#039; and different &#039;gap&#039; sizes:[URL unfurl=&quot;true&quot;]https://www.engineersedge.com/heat_transfer/heat_transfer_coefficients_13822.htm[/URL]Material/Gas coefficients of heat transfer:[URL unfurl=&quot;true&quot;]https://www.engineeringtoolbox.com/thermal-conductivity-d_429.html[/URL]</blockquote>

[QUOTE="-Pjackso, post: 4094085, member: 8119"] This is correct. For the window overall U-value - the glass does provide a (very tiny) R-value via conduction, but it's effectively 0 (as stated). Most of the insulating value of the window comes from the 'gaps' between panes. Heat transfer through the gap requires an 'air-loop' circulation (convection) of the internal gasses. This slows down the heat-transfer, which increases the R-value of the window. More 'gaps' (panes) = slower heat-transfer = improved R-value. 'Air' inside the window gaps works fine for insulating purposes - providing the air is DRY. k-values of air: 0.0262 Watts/meter-K. k-values of argon: 0.016 Watts/meter-K. Per the values above, argon transfers about 1/2 less 'watts' of heat-transfer per area - but air is a viable gas to use also. Overall heat transfer of windows with different 'gasses (air/argon)' and different 'gap' sizes: [URL unfurl="true"]https://www.engineersedge.com/heat_transfer/heat_transfer_coefficients_13822.htm[/URL] Material/Gas coefficients of heat transfer: [URL unfurl="true"]https://www.engineeringtoolbox.com/thermal-conductivity-d_429.html[/URL] [/QUOTE]

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