Abstract: Described is a modular thermal energy transfer system. The modular thermal energy transfer system includes a plurality of modular thermal units, each modular thermal unit having a thermal retainer with a conditioning pipe and a usable fluid pipe disposed therein. The conditioning pipes are in fluidic communication with one another, and the usable fluid pipes are in fluidic communication with one another. The conditioning pipes are adapted to carry a conditioning fluid therethrough and to allow transfer of thermal energy between the thermal retainers and the conditioning fluid. The usable fluid pipes are adapted to carry a usable fluid therethrough and to allow the transfer of thermal energy between the thermal retainers and the usable fluid. The various thermal retainers of the modular thermal units are configured to be positionable proximate one another such that thermal energy is transferable between substantially adjacent thermal retainers.