Answer James, On this style thermostat WP4-83053-003 it doesn't matter. The switch is a "single pole, single throw" (SPST) switch. When the cooling cycle is operating the switch has a "closed" circuit and supplies power to the compressor. When the temperature selected is reached the switch "opens" and removes power to the compressor until the cycle repeats. Read More... Answered by AppliancePartsPros.com | Tuesday, December 9, 2014