Skylight – increasing its R value
I have a 4′ x 4′ skylight double pane filled with argon gas. It faces south and during the the winter in Massachusetts when the sun shines through, it provides plenty of light and passive solar gain.
But night time is another story. The heat loss is quite evident. The chill in the room and the snow cover melting off the glass reminds you of the heat loss.
I was thinking of installing a third pane of plexi or clear plastic to the interior jamb, it is nearly 12” deep. This removable pane would be for the winter only. My concern is, would there be an excessive build up of heat in the new dead air space on sunny days that may compromise the existing double pane lite?
Any thoughts, ideas or experiences.
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