Thermoelectric heat exchanger capable of providing two different discharge temperatures

A thermoelectric heat exchanger and a thermoelectric heating, ventilation and air conditioning system (HVAC) configured to provide a cooled fluid or air stream and a heated fluid or air stream. The thermoelectric heat exchanger may include a plurality thermoelectric devices (TEDs), also known as thermoelectric coolers (TECs) or Peltier coolers, in thermal communication. The thermoelectric devices (116,118) may be arranged in a three dimensional array to provide compact packaging for the thermoelectric heat exchanger assembly. The thermoelectric heat exchanger may be configured to transfer thermal energy between a first thermoelectric device (116) and a second thermoelectric device (118) via evaporation and condensation of a working fluid or refrigerant contained within the thermoelectric heat exchanger (133).