Yes, partially effective until the new energy efficient window is installed. Stop gap measure. Transition period. Etc.

I apologize if that wasn't extremely obvious from what I already wrote.

No need to apologize.

The concern here is that the stopgap measure (the tarp/electric trucks) are implemented too early. The superior replacement window does not yet exist. There is no need to remove the older window and deal with a hole in the side of your house for half a year while you wait for new windows to hit the market.