A clock thermostat can be set to turn on heating and cooling systems only when needed and to turn them off at other times, such as at night or when no one is home.
(A clock thermostat; can be set; to turn on heating and cooling systems only when needed and to turn them off at other times, such as at night) (no one; is; home) (A clock thermostat; to turn on; heating and cooling systems; T:only when needed)
A clock thermostat no one A clock thermostat
can be set is to turn on
to turn on heating and cooling systems only when needed and to turn them off at other times, such as at night
home
heating and cooling systems T:only when needed