Energy can be saved in many different ways. You can upgrade your HVAC system and water heater. Insulation can be added, lighting can be changed to CFLs or LEDs, and appliances can be upgraded to Energy Star models. Along with implementing passive techniques, these energy saving technologies can save a lot of money. Changing your shower heads from a 2.5 gpm head to 1.5 gpm head can save over $430 a year in water heating costs for a 4 person household.