The first interesting observation arrived within five minutes of the arrival of the thermometers. With a mild 10 degrees outside and a cool 18 degrees inside, the wood was one degree colder than the inside surface of the glass, but the wood was warmer to the touch. Perhaps I am seeing the difference in thermal capacity. Glass takes heat from the hand more rapidly than from the wood, and the effect of the air in the sealed unit as an insulator is not immediately apparent. I could observe no difference between solid wood and insulated wood panel. With the arctic blast expected tomorrow, and forecast to last for a few days, I should have better numbers to work on.

( PS. I didn't like the small font, so let's try this one)