Load management auxiliary power system

An auxiliary power unit system for use in combination with existing batteries in trucks having an interior compartment, said system comprising:

• a water cooled diesel engine positioned outside said compartment, said engine capable of producing about 4 horsepower;
• a heater fluidly coupled to said engine, said water circulated between said engine and said heat exchanger by a water pump;
• an air conditioner system producing about 12,000 BTU having a compressor, an evaporator and a condenser, said compressor coupled to said engine;
• and
• an alternator coupled to said engine capable of generating about 120 amperes 12 volts DC;
• wherein operation of said auxiliary power unit system in cold weather allows said heat exchanger to provide warm air for distribution within said interior compartment and in warm weather said air conditioner provides cool air for distribution within said interior compartment whereby any auxiliary power demands are provided by said alternator and those demands that exceed said alternator current are supplied by said truck batteries.