Temperature control units and associated systems components, assemblies, and methods

A temperature control system comprising:

• an air conditioning system configured to supply conditioned air to a conditioned space and draw air from a plenum;
• and
• a supplemental temperature control unit comprising:
• a first fan on a conditioned side of the temperature control unit;
• a second fan on a plenum side of the temperature control unit;
• and
• a thermoelectric element positioned between the first fan and the second fan, the thermoelectric element configured to transfer heat between the conditioned space and the plenum.

A method of conditioning air in a space, the method comprising:

• drawing conditioned air from the space at a conditioned inlet;
• drawing plenum air from a plenum at a plenum inlet;
• passing the conditioned air from the space over a first side of a thermoelectric element;
• passing the plenum air from the plenum over a second side of the thermoelectric element opposite the first side of the thermoelectric element;
• transferring heat between the conditioned air and the plenum air through the thermoelectric element.