Modular air conditioning system

A modular climate control system coupled within an open window of a building, with the window separating an indoor area within the building and an outdoor area external to the building, the modular climate control system straddling a sill of the window and consisting essentially of:

• an interior unit disposed at the window within the indoor area below a horizontal level of the sill, said interior unit including:
• a fluid to air heat exchanger and
• a fan to circulate air across said fluid to air heat exchanger;
• an exterior unit disposed at the window in the exterior area below the horizontal level of the sill, the exterior unit including:
• a fluid to fluid heat exchanger and
• a system for supplying a working fluid that undergoes a pressure drop to cool said working fluid, said working fluid within a first circulation loop, said cooled working fluid being directed to a first side of said fluid to fluid heat exchanger;
• and
• a circulation hose that extends through the window and over the sill to connect the exterior unit and the interior unit, the circulation hose connected between a fluid side of said fluid to air heat exchanger and a second side of said fluid to fluid heat exchanger, said circulation hose allowing a circulating fluid, that is maintained separate and apart from said working fluid, within a second circulation loop, to transport heat between said interior unit and said exterior unit such that the cooling of said working fluid and the cooling of said circulating fluid are temporally decoupled from one another,
• wherein said circulating fluid is a non-toxic, user serviceable fluid and wherein said circulation hose is coupled to said interior unit and said exterior unit in a releasable manner,
• wherein a user can uncouple and recouple any number of modular interior units with said exterior unit without disrupting said first circulation loop containing said working fluid.