US PATENT SUBCLASS 165 / 254
.~.~.~ System selects heating or cooling mode automatically (e.g., responsive to season, ambient light, temperature in conditioned area, 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.~.~.~ System selects heating or cooling mode automatically (e.g., responsive to season, ambient light, temperature in conditioned area, etc.) {5}
255  DF  .~.~.~.~> Dead band between heating and cooling
256  DF  .~.~.~.~> Variable rate of heating or cooling (e.g., plural stages, etc.)
257  DF  .~.~.~.~> Room and ambient temperature sensors
258  DF  .~.~.~.~> Separate heating and cooling thermostats
259  DF  .~.~.~.~> Single temperature sensing means

DEFINITION

Classification: 165/254

System selects heating or cooling mode automatically (e.g., responsive to season, ambient light, temperature in conditioned area, etc.):

(under subclass 253) Subject matter including a means for switching between heating or cooling operation without manual intervention by an operator.

SEE OR SEARCH CLASS

236, Automatic Temperature and Humidity Regulation,

1, for heating and cooling control devices; subclasses 91+ for thermostatic control of hot and cold.