Thermostat Housing Models 2000, 2600, 2610, 2810, 2910, 3000, 3600, 3610, 3910, 4000, 4100, 4110, 4600, 4610, 4630, 5000, 5110, 550, 555, 5600, 5610, 6410, 6600, 6610, 6700, 6710, 7000, 7600, 7610