What about apartments?

In scouring the net for tips on saving money I have found that a lot of them do not apply to people that live in apartments.

• I can't grow a garden.
• I can't buy tons of food to freeze in a stand alone freezer cause I don't have one or have space for one.
• I can't do anything about getting windows/doors that don't let in as much air.
• I can't install a second thermostat to control the temp upstairs.