|Number of households by heated area (excluding garage)|
|186 to 232 square metres (2,001 to 2,500 square feet)||232 or more square metres (2,501 or more square feet)|
|Number of light bulbs using a programmable timer control|
|Two to three||156,087||M||290,022||A|
|More than three||51,107||M||303,481||M|
|Number of light bulbs using a motion detector|
|Two to three||230,380||A||617,825||A|
|More than three||73,629||M||141,422||M|
|Number of light bulbs using a light sensor|
|Two to three||139,145||M||161,361||M|
|More than three||–||U||61,496||M|
Note:Due to rounding, the numbers may not add up and may differ slightly among tables.
The letter beside each estimate classifies its quality as follows: A–Acceptable, M–Use with caution, U–Too unreliable to be published.
Source:2011 Survey of Household Energy Use