US PATENT SUBCLASS 165 / 256
.~.~.~.~ Variable rate of heating or cooling (e.g., plural stages, etc.)

Current as of: June, 1999
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165 /   HD   HEAT EXCHANGE

200  DF  WITH TIMER, PROGRAMMER, TIME DELAY, OR CONDITION RESPONSIVE CONTROL {14}
201  DF  .~ Having heating and cooling capability {13}
253  DF  .~.~ Temperature sensor controlling temperature {4}
254  DF  .~.~.~ System selects heating or cooling mode automatically (e.g., responsive to season, ambient light, temperature in conditioned area, etc.) {5}
256.~.~.~.~ Variable rate of heating or cooling (e.g., plural stages, etc.)

DEFINITION

Classification: 165/256

Variable rate of heating or cooling (e.g., plural stages, etc.):

(under subclass 254) Subject matter wherein said system is capable of operating to provide variable quantity of heating or cooling energy per unit time to said area.

SEE OR SEARCH CLASS

236, Automatic Temperature and Humidity Regulation,

1+, for multistage control devices.