A compressor assembly configured to increase pressure of a fluid, the compressor assembly comprising: a first cylinder forming a first space for compressing the fluid; a second cylinder forming a second space for compressing the fluid; a first piston configured to reciprocate in the first cylinder so as to compress the fluid; a second piston configured to reciprocate in the second cylinder so as to compress the fluid; a first crank shaft configured to drive the first piston; a second crank shaft configured to drive the second piston; a first crank shaft housing operatively connected to the first cylinder and configured to house the first crank shaft; a second crank shaft housing operatively connected to the second cylinder and configured to house the second crank shaft; a motor operatively connected to the first crank shaft and the second crank shaft and configured to drive the first crank shaft and the second crank shaft: and a motor housing operatively connected to the first crank shaft housing and the second crank shaft housing and configured to house the motor; the motor housing comprising a tube with a first end and a second end, the motor housing open at the first end and the second end, the first end coupled to the first crank shaft housing and the second end coupled to the second crank shaft housing; characterized by a first thermal insulator disposed between the first end of the motor housing and the first crank shaft housing to enhance thermal insulation between the first end of the motor housing and the first crank shaft housing; and a second thermal insulator disposed between the second end of the motor housing and the second crank shaft housing to enhance thermal insulation between the second end of the motor housing and the second crank shaft housing. a first cylinder forming a first space for compressing the fluid; a second cylinder forming a second space for compressing the fluid; a first piston configured to reciprocate in the first cylinder so as to compress the fluid; a second piston configured to reciprocate in the second cylinder so as to compress the fluid; a first crank shaft configured to drive the first piston; a second crank shaft configured to drive the second piston; a first crank shaft housing operatively connected to the first cylinder and configured to house the first crank shaft; a second crank shaft housing operatively connected to the second cylinder and configured to house the second crank shaft; a motor operatively connected to the first crank shaft and the second crank shaft and configured to drive the first crank shaft and the second crank shaft: and a motor housing operatively connected to the first crank shaft housing and the second crank shaft housing and configured to house the motor; the motor housing comprising a tube with a first end and a second end, the motor housing open at the first end and the second end, the first end coupled to the first crank shaft housing and the second end coupled to the second crank shaft housing; characterized by a first thermal insulator disposed between the first end of the motor housing and the first crank shaft housing to enhance thermal insulation between the first end of the motor housing and the first crank shaft housing; and a second thermal insulator disposed between the second end of the motor housing and the second crank shaft housing to enhance thermal insulation between the second end of the motor housing and the second crank shaft housing.