Removable insulation maybe? I'm thinking single pane exterior storm windows. When conditions like this exist you can then open your regular windows effectively removing insulation and allowing more heat loss to the exterior. Installed well, these would also increase the r value of the lowest performing part of your house, and increase the air tightness of your home. I'm not sure how many BTUs you could actually move with this method, but you don't need to power anything for it to work either...
*Edit: Just did some math based on what I could find and it looks like with a 5°F temp difference you can move about 5.5 BTU/h per sqft.
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