A two stage reciprocating compressor and associated HVAC systems and methods are disclosed. At least a portion of the sleeve about the rotor core and the permanent magnets has a coefficient of thermal expansion that is substantially equal to the aggregate coefficient of thermal expansion of the rotor core and the plurality of permanent magnets. 4 or less, where D5 is the 5% cumulative particle diameter of the pigment and D95 is the 95% cumulative particle diameter of the pigment. The stabilization device includes a first pressure element which is movable in the receiving part so that it can be pressed onto the head to lock the angular position of the head.