It's like this:
A client asks for the appraiser to determine the air temperature in a one room country school house at the time of inspection.
The SCA loving appraiser notices several thermometers in the room and looks at them. The readings are close, but three thermometers near the center of the room are in closest agreement. For once in his life he takes the average temperature as his estimate, since these three thermometers are a model match. He EA's the calibration of each and forms an opinion of the most probable room temperature at the time of inspection.
The CA appraiser gets to work. First, he hunts down the outside temperature records for the past 24 hours (luckily there is a nearby weather station). He notes, based upon interviews with the custodian that there has been no heating or AC activity for the past several days and no one was in the building. Heck, this should be a cookie cutter for him!
He has the local utility perform an energy audit including an infiltration test. Checks the weather station again for percent of clouds the previous day. He documents his assumptions for all to see, calibrating the interior temperature estimate based upon historical exterior temperature and gains and/or losses by infiltration, direct solar radiation and other heat loading sources. The model rivals in complexity, that of an econometric model sim city residents would be proud of, not unlike an IPCC supported climate model.
He arrives at a point value room temperature estimate.
OK, I'm being a bit sarcastic.
Greg, I enjoyed reading "you know who's" musings. Thanks for sharing.
(By the time my brother in law was well enough to comment, your easement deal was settled, so I didn't pester him for a post).