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From: parnass@ihuxf.UUCP (Bob Parnass, AJ9S)
Newsgroups: net.misc,net.physics
Subject: Re: Why don't thermostats work?
Message-ID: <1993@ihuxf.UUCP>
Date: Fri, 3-Feb-84 09:08:25 EST
Article-I.D.: ihuxf.1993
Posted: Fri Feb  3 09:08:25 1984
Date-Received: Wed, 8-Feb-84 03:33:21 EST
References: <877@ihuxl.UUCP>
Organization: AT&T Bell Labs, Naperville, IL
Lines: 10

Your thermostat and furnace form a control system. Control systems
often have some amount of hysteresis designed in to prevent oscillation.

If your system had no hysteresis, the furnace would be cycled off and
on much more frequently, shortening the life of the components.


-- 
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Bob Parnass,  AT&T Bell Laboratories - ihnp4!ihuxf!parnass - (312)979-5760