I guess if you've been putting off projects like replacing old, single-pane windows, replacing an ancient furnace, and other modifications that will increase energy efficiency, sooner is probably better than later with current energy prices, too. If you rely on fuel oil deliveries and other utilities to keep the house warm, then a well insulated home will stay warmer longer if something disrupts those supplies. Obviously, it won't stay warm forever, but better than in some creaky, leaky home.

I really should replace the old single pane windows in my new house.