Radiator heat distributing apparatus
Reactive heating control system
Recirculating fan thermostat
Remotely activated opposing pressure air flow control register
Remotely activated opposing/aiding air flow control register
Remotely controlled electrically actuated air flow control regis
Residential heating and air conditioning control system
Reversible fan of electronic module
Ridge vent with shape-memory actuated heat valve
Room grating control
Room temperature control apparatus having feedforward and feedba