Turn your thermostat down 2 degrees / AC up 2 degrees -- U.S. households consume 183 billion kWh for air conditioning (1,710 kWh/year per household). About 57% of U.S. households use natural gas as the main fuel for space heating. About 30% use electricity.

Households using electricity for space heating consume 3,524 kWh/year for space heating. Households using natural gas consume 55.4 million Btu/year for space heating. This means that households with electric heating use a total of 5,234 kWh/year for heating and cooling (3.5 tons CO2 emitted). Households with natural gas heating use 1,710 kWh/year for cooling and 55.4 million Btu/year for heating (total 4.4 tons CO2).

Adjusting your thermostat 2 degrees (up in summer, down in winter) can save 4%.

Programmable thermostat / AC -- U.S. households consume 184 billion kWh for air conditioning (1,710 kWh/year per household). Approximately 57% of U.S. households use natural gas as the main fuel for space heating. About 30% use electricity.

Households using electricity for space heating consume 3,524 kWh/year for space heating. Households using natural gas consume 55.4 million Btu/year for space heating. This means that households with electric heating use a total of 5,234 kWh/year for heating and cooling (3.5 tons CO2 emitted). Households with natural gas heating use 1,710 kWh/year for cooling and 55.4 million Btu/year for heating (total 4.4 tons CO2).

Installing a programmable thermostat can save as much as 10%.

Insulate your home -- U.S. households consume 183 billion kWh for air conditioning (1,710 kWh/year per household). Approximately 57% of U.S. households use natural gas as the main fuel for space heating. About 30% use electricity. Fuel oil, kerosene or LPG and are not considered.

Households using electricity for space heating consume 3,524 kWh/year for space heating. Households using natural gas consume 55.4 million Btu/year for space heating.

This means that households with electric heating use a total of 5,234 kWh/year for heating and cooling (3.5 tons CO2 emitted). Households with natural gas heating use 1,710 kWh/year for cooling and 55.4 million Btu/year for heating (total 4.4 tons CO2).

Installing insulation and sealing leaks can save as much as 10%.

Air dry your clothes -- The U.S. uses 66 billion kWh per year to dry clothes.
Air drying rather than machine drying laundry three months every year would save 25% of this energy.

Set your water heater to 120�F -- About 40% of U.S. households use electricity for water heating (PDF). Households with electric water heaters use 2,552 kWh/year for water heating (PDF).

About 54% of U.S. households use natural gas for water heating (PDF). The average U.S. household uses 19,000 cf natural gas per year (19.7 million Btu) (PDF).

There is 3-5% energy savings for each 10 degrees decrease. The typical default setting on a water heater is 140 degrees. Environmental Defense assumes a conservative savings of 3% per 10 degrees -- thus 6% savings for a 20 degree decrease.

Energy Star refrigerator -- Energy Star refrigerators use, on average, 40% less energy than traditional models. The average American household uses 1,462 kWh per year on refrigeration.

Energy Star TV -- Energy Star televisions use 30% less energy than traditional models. The average American household consumes 308 kWh per year for TV use (with 107 million households).

Energy Star dishwasher -- Energy Star dishwashers use about 41% less energy than traditional models. Dishwashers in the average American household use approximately 271 kWh per year (with 107 million households).

Energy Star computer, monitor, and printer -- Energy Star computers, monitors, and printers use about 75%, 85%, and 60% less energy, respectively, than traditional models. The average American household uses about 215 kWh per year on computer use (with 107 million households). For this calculation, Environmental Defense assumes energy savings of 75% for replacing all three appliances.

Energy Star clothes washer -- Energy Star washing machines use, on average, 50% less energy than traditional models. The average household consumes 93 kWh per year to run a washing machine (with 107 million households).

On-demand "tankless" water heater -- About 54% of U.S. households use natural gas for water heating (PDF). These households consume 19,000 cf natural gas per year (19.7 million Btu) for water heating (PDF).

Replacing a standard tank natural gas water heater with on-demand heating can save up to 30%.

Solar water heater -- About 40% of U.S. households use electricity for water heating (PDF). Households with electric water heaters use 2,552 kWh/year for water heating (PDF).

Approx. 54% of U.S. households use natural gas for water heating (PDF). The average U.S. household uses 19,000 cf natural gas per year (19.7 million Btu) (PDF).

Low-flow faucets -- Approximately 40% of U.S. households use electricity for water heating (PDF). Households with electric water heaters use 2,552 kWh/year for water heating (PDF).

Appr. 54% of U.S. households use natural gas for water heating (PDF). The average U.S. household uses 19,000 cf natural gas per year (19.7 million Btu) (PDF).

Old faucets have flow rates of 3-7 gallons/minute (gpm) (PDF). For the purposes of this estimate, Environmental Defense uses 4 gpm for old faucets and showerheads. Aerated faucets can have flow rates as low as 0.5 gpm in bathroom sinks and up to 2.2 gpm in kitchen sinks.

The average U.S. household uses 60 gallons of hot water per day, of which 4.6 are used for faucet flow (i.e., 7.7% of all hot water). Replacing old faucets with efficient ones cuts this hot water use in half. Environmental Defense assumes that the percentage savings on energy use is the same as savings from reducing hot water consumption.

Low-flow showerheads -- Approximately 40% of U.S. households use electricity for water heating (PDF). Households with electric water heaters use 2,552 kWh/year for water heating (PDF).

About 54% of U.S. households use natural gas for water heating (PDF). The average U.S. household uses 19,000 cf natural gas per year (19.7 million Btu) (PDF).

Old showerheads can have flow rates between 5 and 8 gpm. For the purposes of this estimate, Environmental Defense uses 5 gpm as flow rate for standard showerhead. Low-flow showerheads use 2.5 gpm.

The average U.S. household uses 60 gallons of hot water per day, of which 26 are used for showering (i.e., 43.7% of all hot water). Replacing old showerheads with efficient ones cuts this hot water use in half.

All emissions savings are relative to an .average American diet. (data from the UN: 3,774 calories of food are produced per American per day, with 27.7% calories from animal-based products, of which 54% are meats, 41% dairy and 5% eggs). In this diet Americans eat, on average, 199 calories per day from chicken, 209 from pork and 119 from beef.

A meal with no meat. diet assumes that every American eats 350 fewer calories from meat each week (this is about one-third the average daily meat intake, or one meal.s worth of meat). For the .one meal with no meat. and .one day with no meat., avoided calories from assorted meats are in the same proportions as they are consumed in the mean American diet. In all diets, dairy and egg intake remains unchanged and calories from meat are replaced with calories from plant-based foods. The emissions savings from these dietary choices are calculated assuming that the meat not consumed by Americans is also not consumed by others outside the U.S.

CO2 emissions are based on previously published values of the amount of fossil fuel used (and thus the amount of CO2 emitted) to produce different types of foods. Non-CO2 emissions (given as .CO2 equivalents.) from animal-based foods (eggs, dairy, and various meats) are based on data from the U.S. Department of Energy. Only methane and nitrous oxide from animal digestion and manure management are considered. The calculation assumes there are no non-CO2 emissions from crop production.

Recycled paper -- Let's assume that 500 sheets of paper weigh approximately 5 pounds. Environmental impact estimates were made using the Environmental Defense Paper Calculator.

Recycle steel ("tin") cans -- The average U.S. household uses 90 lbs of steel cans each year. Recycling this saves 144 kWh.

Recycle aluminum cans -- Recycling one aluminum can saves 0.35 kWh. Americans use 200 million aluminum cans per day.

Recycle glass bottles -- Recycling one glass bottle saves 0.4 kWh. The average U.S. household uses about 383 containers per year.

Drive less aggressively -- EPA's latest regulation on fuel economy labeling (PDF) suggests that highway and city driving is a 57/43 split; assuming that potential fuel economy improvement is half of the maximum improvement suggested in the fueleconomy.gov, Environmental Defense estimates that potential fuel economy improvement is 10.5 percent. The emissions savings are based on a vehicle with a fuel economy of 19.6 mpg being driven 11,900 miles a year and emitting 25.3371 pounds of CO2 per gallon of gasoline consumed. Cost savings based on an average price of motor gasoline (all grade) in 2006 of $2.33, including taxes (Energy Information Administration, March 2007 Monthly Energy Review, Table 9.4, 03/27/07.

Drive the speed limit -- Reducing speed from 70 mph to 65 mph results in a 9% improvement in fuel efficiency (XLS). Cost savings based on an average price of motor gasoline (all grade) in 2006 of $2.33, including taxes (Energy Information Administration, March 2007 Monthly Energy Review, Table 9.4, 03/27/07.

Keep your car tires inflated -- Under-inflated tires can lower gas mileage by 0.4 percent for every 1 psi drop in pressure of all four tires. The emissions savings are based on a 3.3% increase in fuel efficiency. Cost savings based on an average price of motor gasoline (all grade) in 2006 of $2.33, including taxes (Energy Information Administration, 03/07 Monthly Energy Review, Table 9.4, accessed on March 27, 2007).

Drive 10 miles less -- Driving 10 miles less each week, or 520 miles less each year would reduce the average miles driven from 11,900 to 11,320. The emissions savings are calculated assuming the vehicle has a fuel economy of 19.6 mpg and emits 25.3371 pounds of CO2 per gallon of gasoline consumed. Cost savings based on an average price of motor gasoline (all grade) in 2006 of $2.33, including taxes (Energy Information Administration, March 2007 Monthly Energy Review, Table 9.4, 03/27/2007.

Carpool or take public transit to work -- The average commute in the U.S. is 30 miles.
Assuming the reduction occurs for 50 weeks, annual driving would drop from 11,900 to 10,400. The emissions savings are calculated assuming the vehicle has a fuel economy of 19.6 mpg and emits 25.3371 pounds of CO2 per gallon of gasoline consumed. Cost savings based on an average price of motor gasoline (all grade) in 2006 of $2.33, including taxes (Energy Information Administration, March 2007 Monthly Energy Review, Table 9.4, accessed on March 27, 2007).

Buy a hybrid or car that's 10% more efficient -- To calculate savings, Environmental Defense assumes you are replacing a vehicle that has a fuel economy of 19.6 mpg (the average U.S. car) with one that gets 21.56 mpg. Environmental Defense also assumes that you drive 11,900 miles each year and emit 25.3371 pounds of CO2 per gallon of gasoline consumed. Cost savings based on an average price of motor gasoline (all grade) in 2006 of $2.33, including taxes (Energy Information Administration, March 2007 Monthly Energy Review, Table 9.4, accessed on March 27, 2007).

Fly less -- A domestic flight originating in the U.S. averages about 42 passenger-miles per gallon and international flights average 21 passenger-miles per gallon, according to the Bureau of Transportation Statistics.

Burning a gallon of jet fuel produces 21.1 lbs of CO2 (U.S. Department of Energy and the Energy Information Administration, Instructions for Form EIA 1605B, Voluntary Reporting of Greenhouse Gas Emissions, Appendix B). In addition, according to the Climate Neutral Network, non- CO2 greenhouse gas emissions from air travel are at least as significant as the CO2 impacts (doubling the emissions as expressed in CO2-equivalents) and upstream processes add an additional 8 percent. Aviation was responsible for appr. 1.8 tons CO2-equivalents per person in 2005.