The ornamental design for a thermostathousing, as shown and described.
FIG. 1 is a perspective view of an embodiment of the thermostat housing.
FIG. 2 is a front elevation view of the thermostat housing of FIG. 1.
FIG. 3 is a left side elevation view of the thermostat housing of FIG. 1.
FIG. 4 is a right side elevation view of the thermostat housing of FIG. 1.
FIG. 5 is a top plan view of the thermostat housing of FIG. 1; and,
FIG. 6 is a bottom plan view of the thermostat housing of FIG. 1.
The rear elevation view of the thermostat housing of FIG. 1 is not shown because no claim is made to ornamentation on the rear of the thermostat housing.