Thanks to technology, houses have evolved light years beyond their earliest task of providing simple shelter. They have become total environments that sustain, refresh and provide us with a high level of healthful comfort.
From air conditioners to zone heating systems, a wide variety of machines and systems equip today's homes for these responsibilities.
There are two important facts you should know about heat movement. First, heat seeks a balance. Applied to a home's air temperature, this means warm air always moves from a warm place to a colder one and vice versa; the greater the difference, the faster the flow of heat. Second, heated air rises. Unless it's stirred up, the air in a room tends to stratify-warm air gathers near the ceiling, cool air moves toward the floor.
--Don Vandervort
