If no one is at home during the day, you can program your thermostat to turn the air conditioner to 81 degrees when you leave and then to return it to 78 degrees just before you arrive home.
(no one; is; at home; T:during the day) (you; can program; your thermostat; to turn the air conditioner to 81 degrees when you leave and then to return it to 78 degrees) (you; leave; )
no one you you
is can program leave
at home T:during the day
your thermostat to turn the air conditioner to 81 degrees when you leave and then to return it to 78 degrees