Heat pump temperature control

A method of forming a heat pump system, comprising:

• manipulating a pressure of a fluid flow with a variable stage compressor, wherein the variable stage compressor is fluidly connected to the fluid flow and a heat exchanger is connected to the fluid flow;
• controlling operation of the variable stage compressor in response to a temperature demand from the heat exchanger and a fluid conducting condition of a bypass passage that allows a portion of the fluid flow from the variable stage compressor to bypass the heat exchanger and be directed upstream of the variable stage compressor;
• when the temperature demand is less than a capacity of the heat pump system to exchange thermal energy with an air stream and the variable stage compressor is at a minimum capacity, manipulating a valve assembly to incrementally open and close the bypass passage to satisfy the temperature demand, until a minimum opening or a maximum opening of the valve assembly is reached;
• and
• when the temperature demand is greater than the capacity of the heat pump system to exchange thermal energy with the air stream and the valve assembly is at the minimum opening, the valve assembly maintains the bypass passage and the variable stage compressor increases a capacity of the variable stage compressor to satisfy the temperature demand, until a maximum capacity of the variable stage compressor is reached.