Freezer with defrosting indicator

Freezing apparatus for liquid-filled pipelines

Freezing tank

Frozen foodstuffs thawing detector device

Fuel-flow monitor and automatic air-compressor cut-off

Gas detector and method for refrigeration systems

Gas heat pump-type air conditioner

Hand pump for evacuating and charging a refrigerating system

Heat pump apparatus having refrigerant level indication and asso

Heat pump compressor crankcase low differential temperature dete

Heat pump control having an electronic control module with a byp

Heat pump control system

Heat pump having an accumulator with refrigerant level sensor

Heat pump output indicator

Heat pump system compressor fault detector

Heat pump system defrost control system with override

Heat pump with single exterior temperature sensor

Heat transfer system method and apparatus

Heating and cooling unit using power inverter with battery

Heating, ventilation, air conditioner performance test system