Methods and devices for performing chemical reactions under controlled temperature are described. In one embodiment, the devices provided by the invention comprise a housing diminished hold a reaction chamber disposed within an interior volume of the housing. The reaction chamber has thermally conductive interior and exterior surfaces defining an internal volume therein at a first temperature. The device also includes at least one temperature-control substance at a second temperature into said bladder and expel said temperature-control substance, the bladder expands to about substantially at least a portion of said exterior surfaces of said reaction chamber to enable thermal exchange between said temperature-control substance the said internal volume of reaction chamber.