US PATENT SUBCLASS 165 / 242
.~.~.~.~ Responsive to outdoor temperature

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}
240  DF  .~.~ Heat pump and supplemental heat source {1}
241  DF  .~.~.~ Change-over from heat pump operation to supplemental heat source operation alone {1}
242.~.~.~.~ Responsive to outdoor temperature

DEFINITION

Classification: 165/242

Responsive to outdoor temperature:

(under subclass 241) Subject matter wherein said converting means reacts to outdoor temperature.