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You're considering installing a 4-foot-high by 8-foot-wide picture window in a north-facing wall (no solar gain)...

You're considering installing a 4-foot-high by 8-foot-wide picture window in a north-facing wall (no solar gain) that now has a total R (specific thickness of material) value of 23. As a compromise between initial cost and energy savings, you've chosen a standard double-glazed window with the value of R is 2.0. As a result of installing this window, how much more oil will you burn in a 6-month winter heating season with an average outdoor temperature of 25F and an indoor temperature of 68F? Assume your oil furnace is 80% efficient.

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genius_generous answered 1 year ago
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