Compact air conditioning apparatus, cord harness and method of use thereof

An electric air conditioning apparatus comprising:

• a housing having an air inlet, an air outlet and a mounting element connectable to a support structure;
• a vent assembly in said air outlet;
• a user interface on an external surface of the housing;
• a power input configured to facilitate an electric connection to an external battery;
• a fan within the housing between the air inlet and the air outlet configured to move air through said housing from the air inlet to the air outlet;
• a heater core within said housing between the air inlet and the air outlet, wherein said fan moves air through said heater core, said heater core comprising:
• a control module operably connected to said power input, said user interface and said fan, and configured to operate said electric air conditioning apparatus based on an operation input received through said user interface,
• a first PTC heater operably connected to said control module,
• a second PTC heater in a stacked configuration with said first PTC heater and operably connected to said control module, wherein during operation said fan is configured to move air through said first PTC heater and said second PTC heater serially and said control module is configured to control the operation of said first PTC heater separate from said second PTC heater;
• and
• wherein, when said operation input is received, said control module staggers application of power to said first PTC heater and to said second PTC heater, wherein said application of power is configured to limit overall power loss during start-up of the first PTC heater and second PTC heater.