Table HC6-1a. Usage Indicators by Climate Zone, 

 Million U.S. Households, 2001 

________________________________________________________________________________________________________

 | | | 

 | | Climate Zone1 | 

 | |_________________________________________________| 

 | | | | 

 | | Fewer than 2,000 CDD and -- | | 

 | |_______________________________________|2,000 CDD| 

 | | | | | | or More | 

 | | | | | Fewer |and Fewer| 

 | |More than| 5,500 to| 4,000 to| than | than | 

 Usage Indicators | Total |7,000 HDD|7,000 HDD|5,499 HDD|4,000 HDD|4,000 HDD| 

 |_________|_________|_________|_________|_________|_________| RSE 

 | | | | | | | Row 

 RSE Column Factor: | 0.4 | 1.8 | 1.1 | 1.1 | 1.2 | 1.0 |Factors

____________________________________|_________|_________|_________|_________|_________|_________|_______

 | 

Total............................... 107.0 9.2 28.6 24.0 21.0 24.1 | 7.8 

 | 

Weekday Home Activities | 

 | 

 Home Used for Business | 

 Yes............................. 7.6 0.9 1.9 2.2 1.2 1.3 | 14.9 

 No.............................. 99.4 8.3 26.8 21.8 19.8 22.8 | 8.0 

 | 

 Energy-Intensive Activity | 

 Yes............................. 1.7 0.2 0.7 0.5 Q Q | 22.6 

 No.............................. 105.2 9.0 28.0 23.5 20.9 23.9 | 7.9 

 | 

 Someone Home All Day | 

 Yes............................. 53.0 4.5 14.0 11.9 10.8 11.7 | 7.8 

 No.............................. 53.9 4.7 14.6 12.1 10.2 12.3 | 7.4 

 | 

Heating | 

 | 

 Heat Home......................... 106.0 9.2 28.6 23.9 20.7 23.6 | 7.9 

 Do Not Heat Home.................. 1.0 Q Q Q 0.3 0.5 | 16.7 

 No Heating Equipment............ 0.5 Q Q Q Q 0.4 | 34.0 

 Have Equipment But | 

 Do Not Use It................... 0.4 Q Q Q 0.2 Q | 33.7 

 | 

Adequacy of Insulation | 

 Well Insulated.................... 42.6 3.8 12.3 10.3 7.2 9.1 | 8.9 

 Adequately Insulated.............. 43.1 3.6 10.7 9.8 8.7 10.3 | 8.1 

 Poorly Insulated.................. 19.4 1.6 5.4 3.7 4.6 4.2 | 10.3 

 No Insulation..................... 0.9 Q Q Q 0.2 0.3 | 27.1 

 Don't Know........................ 0.9 Q Q Q 0.3 Q | 30.3 

 | 

Occurrences of Drafts During Winter | 

 All of the Time................... 5.9 0.5 2.1 1.2 0.9 1.3 | 16.6 

 Most of the Time.................. 6.4 0.5 1.6 1.5 1.4 1.4 | 14.2 

 Some of the Time.................. 34.6 3.3 9.8 8.0 7.2 6.3 | 9.1 

 Never............................. 55.3 4.7 13.9 12.4 10.5 13.8 | 8.4 

 Don't Know........................ 4.7 0.4 1.2 0.9 1.0 1.3 | 16.2 

 | 

 Thermostat | 

 Heat Home....................... 106.0 9.2 28.6 23.9 20.7 23.6 | 7.9 

 Thermostat Available During | 

 Heating Season................ 91.5 8.2 26.4 19.2 17.0 20.7 | 8.4 

 Programmable2 | 

 Yes....................... 25.1 2.4 7.8 5.1 5.5 4.3 | 12.2 

 No........................ 66.4 5.8 18.6 14.2 11.5 16.3 | 8.4 

 No Thermostat................. 14.5 1.1 2.2 4.7 3.6 2.9 | 11.4 

 Do Not Heat Home................ 1.0 Q Q Q 0.3 0.5 | 16.7 

 | 

Lower Winter Temperature Settings2 | 

 Daytime When No One is at Home | 

 Yes............................. 47.2 4.2 12.5 9.0 11.0 10.5 | 9.1 

 No.............................. 48.5 4.5 13.9 13.0 6.9 10.2 | 8.7 

 Unknown......................... 10.3 0.6 2.2 1.9 2.7 2.9 | 12.4 

 During Sleeping Hours | 

 Yes............................. 45.7 4.3 11.8 9.6 10.6 9.3 | 9.0 

 No.............................. 51.1 4.3 14.8 12.5 7.6 11.9 | 8.6 

 Unknown......................... 9.2 0.6 2.0 1.7 2.4 2.4 | 13.2 

________________________________________________________________________________________________|_______

See footnotes at end of table. 
Table HC6-1a. Usage Indicators by Climate Zone, 

 Million U.S. Households, 2001 (Continued) 

________________________________________________________________________________________________________

 | | | 

 | | Climate Zone1 | 

 | |_________________________________________________| 

 | | | | 

 | | Fewer than 2,000 CDD and -- | | 

 | |_______________________________________|2,000 CDD| 

 | | | | | | or More | 

 | | | | | Fewer |and Fewer| 

 | |More than| 5,500 to| 4,000 to| than | than | 

 Usage Indicators | Total |7,000 HDD|7,000 HDD|5,499 HDD|4,000 HDD|4,000 HDD| 

 |_________|_________|_________|_________|_________|_________| RSE 

 | | | | | | | Row 

 RSE Column Factor: | 0.4 | 1.8 | 1.1 | 1.1 | 1.2 | 1.0 |Factors

____________________________________|_________|_________|_________|_________|_________|_________|_______

Daytime Winter Temperature When | 

Someone is at Home2 | 

 Heat Turned On.................... 96.8 8.6 26.6 22.2 18.2 21.1 | 8.1 

 63 Degrees or Less.............. 3.9 0.5 1.4 0.7 0.9 0.4 | 17.9 

 64 to 66 Degrees ............... 8.4 0.9 2.6 1.8 2.0 1.3 | 13.9 

 67 to 69 Degrees................ 23.6 3.0 8.0 5.3 4.2 3.2 | 9.7 

 70 Degrees...................... 25.7 2.4 6.3 6.7 4.8 5.4 | 9.9 

 71 to 73 Degrees................ 16.5 1.2 4.6 4.3 2.8 3.5 | 11.4 

 74 Degrees or More.............. 18.6 0.7 3.7 3.4 3.5 7.3 | 11.1 

 Heat Turned Off................... 2.0 Q Q Q 1.0 0.7 | 18.0 

 Unknown/No Answer................. 7.2 0.6 1.8 1.6 1.4 1.8 | 15.6 

 | 

Daytime Winter Temperature When No | 

One is at Home2 | 

 Heat Turned On.................... 87.6 8.5 25.6 21.0 14.4 18.0 | 7.2 

 63 Degrees or Less.............. 17.7 2.2 5.1 3.3 3.8 3.2 | 13.2 

 64 to 66 Degrees ............... 17.2 1.8 5.6 3.7 3.3 2.7 | 11.0 

 67 to 69 Degrees................ 19.1 2.4 6.5 4.6 2.6 3.0 | 11.9 

 70 Degrees...................... 15.1 1.2 4.2 4.6 2.0 3.1 | 11.8 

 71 to 73 Degrees................ 8.7 0.6 2.6 2.6 1.2 1.7 | 13.2 

 74 Degrees or More.............. 9.8 0.3 1.6 2.2 1.4 4.3 | 14.8 

 Heat Turned Off................... 10.5 Q Q 1.2 4.7 3.6 | 13.7 

 Unknown/No Answer................. 8.0 0.6 2.1 1.8 1.6 2.0 | 14.4 

 | 

Winter Temperature During Sleeping | 

Hours2 | 

 Heat Turned On.................... 91.8 8.6 26.2 21.4 15.5 20.1 | 8.3 

 63 Degrees or Less.............. 15.4 2.0 4.4 3.1 3.5 2.4 | 13.0 

 64 to 66 Degrees ............... 17.4 2.0 5.3 3.5 3.6 3.1 | 11.0 

 67 to 69 Degrees................ 21.0 2.4 7.1 5.2 2.9 3.4 | 10.5 

 70 Degrees...................... 17.4 1.3 4.7 4.9 2.6 4.1 | 11.4 

 71 to 73 Degrees................ 9.5 0.5 2.6 2.7 1.4 2.4 | 15.5 

 74 Degrees or More.............. 11.1 0.4 2.1 2.2 1.5 4.9 | 14.4 

 Heat Turned Off................... 7.1 Q Q 0.9 3.8 1.8 | 15.3 

 Unknown/No Answer................. 7.1 0.6 1.9 1.6 1.4 1.7 | 15.5 

 | 

Air-Conditioning | 

 | 

Central Air-Conditioning | 

 Use a Central System.............. 58.6 3.1 13.1 12.9 11.1 18.5 | 9.1 

 All Summer...................... 28.4 0.7 3.6 5.3 6.0 12.8 | 12.2 

 Quite a Bit..................... 12.1 0.5 3.4 3.2 1.6 3.4 | 13.6 

 Only a Few Times................ 16.8 1.8 5.9 4.2 2.9 1.9 | 12.5 

 Not at All...................... 1.4 Q Q Q 0.6 0.4 | 24.6 

 No Central System................. 48.4 6.1 15.5 11.2 9.9 5.6 | 8.5 

 | 

Window/Wall Air-Conditioning | 

 Use Window/Wall Units............. 25.1 2.3 7.9 7.6 3.4 4.0 | 11.1 

 All Summer...................... 4.9 0.2 1.0 1.5 0.8 1.4 | 21.0 

 Quite a Bit..................... 5.2 0.5 1.3 1.8 0.7 0.9 | 19.4 

 Only a Few Times................ 14.1 1.4 5.4 4.1 1.6 1.6 | 11.7 

 Not at All...................... 0.9 Q 0.2 Q 0.3 Q | 23.4 

 No Window/Wall Units.............. 81.9 7.0 20.7 16.5 17.6 20.1 | 6.7 

________________________________________________________________________________________________|_______

See footnotes at end of table. 
Table HC6-1a. Usage Indicators by Climate Zone, 

 Million U.S. Households, 2001 (Continued) 

________________________________________________________________________________________________________

 | | | 

 | | Climate Zone1 | 

 | |_________________________________________________| 

 | | | | 

 | | Fewer than 2,000 CDD and -- | | 

 | |_______________________________________|2,000 CDD| 

 | | | | | | or More | 

 | | | | | Fewer |and Fewer| 

 | |More than| 5,500 to| 4,000 to| than | than | 

 Usage Indicators | Total |7,000 HDD|7,000 HDD|5,499 HDD|4,000 HDD|4,000 HDD| 

 |_________|_________|_________|_________|_________|_________| RSE 

 | | | | | | | Row 

 RSE Column Factor: | 0.4 | 1.8 | 1.1 | 1.1 | 1.2 | 1.0 |Factors

____________________________________|_________|_________|_________|_________|_________|_________|_______

 | 

Hot Water | 

 | 

Dishwasher Use Each Week | 

 Use a Dishwasher.................. 56.7 4.7 14.7 12.3 11.2 13.7 | 7.4 

 Less Than Once a Week........... 9.4 0.7 1.9 2.1 2.2 2.5 | 12.0 

 Once Each Week.................. 7.5 0.7 2.0 1.5 1.7 1.5 | 15.3 

 2 to 3 Times.................... 17.8 1.4 4.8 3.9 3.5 4.2 | 10.6 

 4 to 6 Times.................... 11.7 1.0 2.8 2.6 2.2 3.1 | 12.7 

 At Least Once Each Day.......... 10.4 0.9 3.3 2.1 1.6 2.5 | 12.6 

 No Dishwasher..................... 50.3 4.5 13.9 11.7 9.8 10.4 | 9.1 

 | 

Loads of Laundry Washed Each Week | 

 Use a Clothes Washer.............. 84.1 7.9 22.6 17.9 16.3 19.4 | 7.4 

 1 Load or Less.................. 6.8 0.7 1.5 1.6 1.5 1.4 | 12.9 

 2 to 9 Loads.................... 65.1 6.0 17.4 13.9 12.7 15.1 | 7.8 

 10 to 15 Loads.................. 9.6 1.0 2.8 2.0 1.7 2.2 | 12.7 

 More than 15 Loads.............. 2.7 0.3 0.9 0.5 0.5 0.6 | 23.4 

 No Washing Machine................ 22.9 1.4 6.1 6.1 4.7 4.7 | 10.2 

 | 

Water Temperature Setting for | 

Clothes Washer | 

 Wash Cycle | 

 Hot............................. 6.2 0.3 2.0 1.2 1.1 1.5 | 16.4 

 Warm............................ 49.7 5.0 14.4 11.0 9.3 10.0 | 8.4 

 Cold............................ 28.2 2.6 6.2 5.7 5.9 7.9 | 9.9 

 Rinse Cycle | 

 Hot............................. 1.4 Q 0.4 0.3 0.4 0.3 | 34.1 

 Warm............................ 16.6 1.6 4.9 3.5 3.0 3.6 | 12.3 

 Cold............................ 66.1 6.2 17.3 14.1 12.9 15.5 | 8.3 

 No Washing Machine................ 22.9 1.4 6.1 6.1 4.7 4.7 | 10.2 

 | 

Clothes Dryer | 

 Use a Clothes Dryer............... 78.8 7.6 21.5 16.7 15.0 18.0 | 7.7 

 Every Time Clothes are Washed... 63.5 5.2 17.4 13.2 12.3 15.3 | 8.1 

 Some, but not All, Loads........ 12.7 1.8 3.5 2.8 2.2 2.2 | 11.8 

 Used Infrequently............... 2.7 0.6 0.6 0.6 0.4 0.4 | 21.0 

 No Clothes Dryer.................. 28.2 1.6 7.1 7.4 6.0 6.1 | 9.2 

 | 

Cooking | 

 | 

Number of Hot Meals Cooked in the | 

Home | 

 3 or More Times a Day............. 7.5 0.6 2.3 1.1 1.7 1.8 | 14.5 

 2 Times a Day..................... 26.8 2.3 6.8 6.2 5.4 6.0 | 9.1 

 Once a Day........................ 43.3 4.0 12.9 9.7 7.9 8.9 | 8.9 

 A Few Times Each Week............. 21.7 1.6 5.2 5.0 4.4 5.5 | 10.4 

 About Once a Week................. 4.0 0.4 0.8 0.9 0.9 1.1 | 18.2 

 Less Than Once a Week............. 2.4 0.2 0.4 0.8 0.5 0.5 | 22.1 

 No Hot Meals Cooked............... 1.2 Q 0.3 0.3 Q Q | 48.1 

 | 

Conventional Oven | 

 Use a Conventional Oven........... 99.4 8.9 27.6 22.6 19.0 21.3 | 7.9 

 More Than Once a Day............ 8.6 0.5 2.5 1.7 1.8 2.0 | 14.9 

 Once a Day...................... 17.4 1.8 4.4 4.2 3.7 3.4 | 11.0 

 Between Once a Day and | 

 Once a Week..................... 33.1 3.3 9.9 7.5 5.9 6.6 | 9.5 

 Once a Week..................... 15.6 1.3 4.8 3.3 2.3 3.9 | 10.4 

 Less Than Once a Week........... 24.6 2.0 6.0 5.9 5.3 5.5 | 10.9 

 Do Not Use........................ 7.6 0.3 1.1 1.4 2.0 2.7 | 18.3 

________________________________________________________________________________________________|_______

See footnotes at end of table. 
Table HC6-1a. Usage Indicators by Climate Zone, 

 Million U.S. Households, 2001 (Continued) 

________________________________________________________________________________________________________

 | | | 

 | | Climate Zone1 | 

 | |_________________________________________________| 

 | | | | 

 | | Fewer than 2,000 CDD and -- | | 

 | |_______________________________________|2,000 CDD| 

 | | | | | | or More | 

 | | | | | Fewer |and Fewer| 

 | |More than| 5,500 to| 4,000 to| than | than | 

 Usage Indicators | Total |7,000 HDD|7,000 HDD|5,499 HDD|4,000 HDD|4,000 HDD| 

 |_________|_________|_________|_________|_________|_________| RSE 

 | | | | | | | Row 

 RSE Column Factor: | 0.4 | 1.8 | 1.1 | 1.1 | 1.2 | 1.0 |Factors

____________________________________|_________|_________|_________|_________|_________|_________|_______

 | 

Microwave Oven | 

 Use a Microwave Oven.............. 92.1 8.8 24.8 20.0 17.9 20.7 | 7.1 

 Most or All..................... 8.2 0.7 1.9 1.7 1.7 2.1 | 13.3 

 About Half...................... 19.3 1.9 5.9 4.0 3.7 3.9 | 10.9 

 Some or Very Little............. 22.4 2.0 5.9 5.0 4.6 4.9 | 10.3 

 For Defrosting, Reheating, | 

 or Snacks....................... 42.2 4.1 11.2 9.3 7.8 9.8 | 9.7 

 No Microwave Oven................. 14.8 0.5 3.8 4.0 3.1 3.4 | 13.0 

 | 

Electric Coffee Maker | 

 Use an Electric Coffee Maker...... 65.5 6.7 18.0 14.7 12.1 13.9 | 7.9 

 Three or More Times a Day....... 2.4 0.4 0.6 0.6 0.2 0.5 | 21.2 

 Two Times a Day................. 5.9 0.5 1.9 1.1 1.2 1.2 | 16.4 

 Once a Day...................... 33.6 3.0 9.2 7.5 6.1 7.8 | 9.4 

 A Few Times Each Week........... 9.4 1.2 2.3 2.2 2.0 1.8 | 11.8 

 About Once a Week............... 5.2 0.7 1.6 1.1 0.8 1.0 | 16.4 

 Less than Once a Week........... 9.0 0.9 2.3 2.2 1.9 1.6 | 12.0 

 No Electric Coffee Maker.......... 41.5 2.5 10.6 9.3 8.9 10.2 | 8.1 

 | 

Time Electric Coffee Maker is Left | 

On | 

 Turned Off Right Away............. 18.8 1.7 5.5 4.6 3.7 3.3 | 10.4 

 Less than 15 Minutes.............. 10.0 0.7 2.4 2.8 2.2 2.0 | 13.0 

 15 Minutes to 1 Hour.............. 24.6 2.7 6.5 5.1 4.1 6.2 | 10.9 

 More than 1 Hour.................. 12.1 1.6 3.7 2.3 2.2 2.4 | 13.0 

 | 

Electric Toaster | 

 Use a Electric Toaster............ 36.1 1.9 8.2 9.1 7.6 9.3 | 8.8 

 Three or More Times a Day....... 1.0 Q 0.2 0.4 0.2 0.2 | 33.6 

 Two Times a Day................. 2.7 Q 0.7 0.6 0.7 0.6 | 22.3 

 Once a Day...................... 8.2 0.6 1.7 2.1 1.8 2.1 | 13.4 

 A Few Times Each Week........... 11.9 0.5 2.8 3.1 2.3 3.2 | 12.0 

 About Once a Week............... 4.3 0.3 1.0 0.9 0.9 1.1 | 16.1 

 Less than Once a Week........... 7.9 0.5 1.7 2.0 1.6 2.1 | 13.4 

 No Electric Toaster............... 70.9 7.3 20.5 15.0 13.4 14.7 | 7.6 

 | 

Lights | 

Indoor Lights Turned On: | 

 1 to 4 Hours per Day | 

 None............................ 10.2 1.0 3.1 2.3 1.8 2.2 | 15.4 

 1............................... 30.1 2.5 8.2 7.2 5.3 7.0 | 9.5 

 2............................... 30.7 2.8 8.1 6.5 6.9 6.4 | 9.0 

 3............................... 16.6 1.3 4.6 3.6 3.1 4.0 | 11.9 

 4............................... 10.5 1.0 2.6 2.5 2.1 2.3 | 14.5 

 5 or More....................... 8.8 0.8 2.0 2.0 1.9 2.1 | 15.1 

 | 

 Between 4 and 12 Hours per Day | 

 None............................ 30.2 4.3 9.3 5.1 5.1 6.6 | 11.0 

 1............................... 25.2 1.7 6.0 5.6 5.5 6.4 | 9.9 

 2............................... 25.5 1.4 6.6 6.6 5.7 5.1 | 8.2 

 3............................... 12.7 0.9 3.4 3.3 2.1 2.9 | 12.2 

 4............................... 7.2 0.4 1.9 1.7 1.5 1.7 | 14.0 

 5 or More....................... 6.2 0.4 1.5 1.8 1.1 1.4 | 15.2 

 | 

 More then 12 Hours per Day | 

 None............................ 81.1 8.1 22.8 17.5 15.8 16.9 | 7.4 

 1............................... 14.4 0.7 3.7 3.6 2.3 4.0 | 10.5 

 2............................... 6.8 0.2 1.5 1.4 1.7 2.0 | 16.4 

 3............................... 2.4 Q 0.3 0.8 0.7 0.4 | 32.2 

 4............................... 1.3 Q Q 0.4 0.3 0.4 | 27.6 

 5 or More....................... 1.1 Q Q 0.4 Q 0.3 | 25.0 

________________________________________________________________________________________________|_______

See footnotes at end of table. 
Table HC6-1a. Usage Indicators by Climate Zone, 

 Million U.S. Households, 2001 (Continued) 

________________________________________________________________________________________________________

 | | | 

 | | Climate Zone1 | 

 | |_________________________________________________| 

 | | | | 

 | | Fewer than 2,000 CDD and -- | | 

 | |_______________________________________|2,000 CDD| 

 | | | | | | or More | 

 | | | | | Fewer |and Fewer| 

 | |More than| 5,500 to| 4,000 to| than | than | 

 Usage Indicators | Total |7,000 HDD|7,000 HDD|5,499 HDD|4,000 HDD|4,000 HDD| 

 |_________|_________|_________|_________|_________|_________| RSE 

 | | | | | | | Row 

 RSE Column Factor: | 0.4 | 1.8 | 1.1 | 1.1 | 1.2 | 1.0 |Factors

____________________________________|_________|_________|_________|_________|_________|_________|_______

 | 

Outdoor Lights on All Night | 

 Used.............................. 24.5 1.3 6.4 5.2 4.7 6.9 | 11.1 

 Not Used ......................... 82.5 8.0 22.2 18.8 16.3 17.2 | 7.0 

 | 

Gas Fireplace | 

Use a Gas Fireplace During Winter | 

Months.............................. 3.7 Q 1.2 0.6 1.1 0.6 | 18.5 

 Most Days......................... 1.3 Q 0.5 0.3 0.4 Q | 35.2 

 Almost Once a Week................ 1.1 Q 0.4 Q 0.3 Q | 35.2 

 Less Than 4 Times a Month......... 1.2 Q 0.3 Q 0.4 Q | 30.2 

 | 

Use a Personal Computer............. 60.0 5.7 16.7 13.1 12.1 12.6 | 7.4 

 | 

Hours PC Turned On Each Week | 

 Less Than 2 Hours................. 10.3 1.0 2.7 2.2 1.9 2.6 | 13.2 

 2 to 15 Hours..................... 26.3 2.3 7.5 5.7 5.5 5.3 | 8.9 

 16 to 40 Hours.................... 12.2 1.2 3.3 2.9 2.5 2.3 | 12.4 

 More than 40 Hours................ 5.7 0.7 1.7 1.1 1.0 1.2 | 15.6 

 On All The Time................... 5.6 0.5 1.5 1.2 1.1 1.2 | 17.2 

 | 

Use of PCs Turned on 16 Hours | 

a Week or More | 

 Personal Use Only................. 14.0 1.6 4.2 2.7 2.6 2.8 | 12.8 

 Business Use Only................. 2.1 0.3 0.4 0.5 0.5 0.4 | 20.8 

 Both Personal and Business........ 7.3 0.5 1.9 1.9 1.5 1.5 | 13.7 

 | 

Business Use of PCs Turned on 16 | 

Hours a Week or More | 

 Use to Telecommute................ 3.6 0.2 1.0 0.9 0.5 0.9 | 19.4 

 Other Business Use................ 5.8 0.5 1.3 1.5 1.5 1.0 | 14.9 

 | 

Battery Operated Appliances/Tools | 

 Use Battery Operated Appliances/ | 

 Tools............................. 47.7 5.0 13.9 10.3 8.6 9.9 | 8.9 

 | 

 How Maintained When | 

 Not in Use | 

 Plugged in All The Time......... 10.8 1.0 3.0 2.2 2.1 2.5 | 13.8 

 Recharged As Needed............. 33.8 3.6 9.9 7.4 5.9 6.9 | 9.5 

 Both Ways are Used.............. 3.1 0.3 1.0 0.7 0.6 0.5 | 19.0 

 Don't Use Any..................... 59.3 4.2 14.7 13.7 12.4 14.2 | 7.9 

________________________________________________________________________________________________|_______

 1 One of five climatically distinct areas, determined according to the 30-year average (1961-1990) of 

the annual heating and cooling degree-days. For this report, the heating or cooling degree-days are a 

measure of how cold or how hot a location is over a period of one year, relative to a base temperature 

of 65 degrees Fahrenheit. A household is assigned to a climate zone according to the 30-year average 

annual degree-days for an appropriate nearby weather station. 

 2 The 1.0 million households that do not heat their homes are not included in these categories. 

 Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or 

fewer than 10 households were sampled. 

 Notes: • To obtain the RSE percentage for any table cell, multiply the corresponding column and row 

factors. • Because of rounding, data may not sum to totals. • See "Glossary" for definition of terms 

used in this report. • All temperatures listed are in degrees Fahrenheit. 

 Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, 

C of the 2001 Residential Energy Consumption Survey.