Putting your house on an energy diet is simple: airtight construction, smart heating and cooling design, and high-efficiency appliances. But simple doesn't mean easy. You might as well tell Americans they ought to lay off nacho chips and sign up for a daily Zumba class. The nation's power demands, like our waistlines, are growing ever more bloated.Putting your house on an energy diet is simple: airtight construction, smart heating and cooling design, and high-efficiency appliances. But simple doesn't mean easy. You might as well tell Americans they ought to lay off nacho chips and sign up for a daily Zumba class. The nation's power demands, like our waistlines, are growing ever more bloated.

• 2008-04-27The President and the First Lady arrive in South
• 2008-04-27The President and the First Lady arrive in South
• 2008-04-27The President and the First Lady arrive in South Maalhosmadulu
• 2008-04-27The President and the First Lady arrive in South Maalhosmadulu
• 2008-04-27The President and the First Lady arrive in South Maalhosmadulu
• 2008-04-27The President and the First Lady arrive in South Maalhosmadulu
• 2008-04-27The President and the First Lady arrive in South Maalhosmadulu
• 2008-04-27The President and the First Lady arrive in South Maalhosmadulu
• 2008-04-27The President and the First Lady arrive in South Maalhosmadulu
• 2008-04-27The President and the First Lady arrive in South Maalhosmadulu
• 2008-04-27The President and the First Lady arrive in South Maalhosmadulu
• 2008-04-27The President and the First Lady arrive in South Maalhosmadulu