FIG. 1 is a front perspective view of a thermostat showing our new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a second front perspective view thereof; and,
FIG. 9 is a second front elevation view thereof.
The broken lines of even length illustrate portions of the thermostat that form no part of the claimed design.