A thermostat— a fixture on a wall, a product designed to give us control. Nearly everyone using one trusts that it works. We touch; we set. Then we expect a lickety-split responsive result, and more. We expect a persistence of the result. We want our choice of a specific temperature and we want it to stay that way with no fuss, hour following hour. But getting what we want in degrees Fahrenheit isn't that easy.
Remember the imbalance in seasonal billing mentioned on the previous Page, Calendar model? That was all about real-time physical events in buildings. Real as real can be.
An imbalance: on any day 82 degrees and above, problems from discord between temperatures of inside surfaces and temperatures of conditioned air. This is because there is poor heat control in roof and wall sandwiches (the roof and wall is built layer next to layer next to layer like a sandwich). Inadequately designed, heat from sun is absorbed then finds its way inside, in a timely way. This type of heat — this "radiance" we'll call it — is bullying and ready to get at it right after the rooster crows. Sun up, radiance begins. And when inside surfaces and conditioned air are in a tug-of-war, thermal chaos is all around. A mechanical system can be state of the art. It can be well-engineered. But it will help only so much if all that mechanical work is working alone, in conflict with a building's basic shell.
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