this is a THERMOSTAT.
The Big Bang Theory Season 9, Episode 10
Can I control the THERMOSTAT?
The Big Bang Theory Season 5, Episode 15
Why don't you just
turn up the THERMOSTAT?
The Big Bang Theory Season 5, Episode 17
the THERMOSTAT when
you're not there.
The Big Bang Theory Season 7, Episode 24
...of the THERMOSTAT
ever since the sweaty night of '06.
The Big Bang Theory Season 3, Episode 2