1) Turn down your water heater's thermostat. This is a super-easy way to minimize your energy consumption.
Turning your thermostat down from 140 to 120 degrees Fahrenheit can result in savings of as much as 26%. One thing to keep in mind, your dishwasher may not clean as well with the lower temperature, however,
most modern dishwashers have a "booster heater" on them that will boost the water temperature to the ideal heat of 140+ degrees needed for dishwashing. When you buy a dishwasher, be sure to ask if it has this feature either automatically or with the push of a button.
From my own personal experience, I've had to experiment with what environmentally friendly dishwashing detergents work best with my dishwasher and turning down the thermostat (even while using my booster heater) has definitely ixnayed certain brands.2) Take shorter showers (or even cold showers!). Heating water for showers
accounts for 2/3 of all water-heating costs. So cutting your showers in half will result in
33% reduction of your water heating costs. Taking cold showers would
reduce your bill by a full 66%!
I frequently take short cold showers during the hot summers in Los Angeles. Saves energy and cools me off big time! We also use a shower shut-off valve (pictured at right) to easily turn the water flow off and on (without dealing with the faucets themselves) which makes using less water a breeze.

4) Install a drip system for your landscaping. Not only will your plants be happier (drip systems get water to the roots of plants where they are needed most) you'll save tons of water because using sprinklers wastes water through evaporation (most of the water evaporates from the surface before getting down to the roots of the plants where it is needed.) Last time I ran the numbers, my husband and I
each used less than 25% of the water of the average Angeleno, and that's with significant landscaping.
And drip systems are very inexpensive and really easy for a DIY type to do themself. DripWorks estimates that a system can pay for itself in one season. I'd say our drip system cost about $200 or less to irrigate rougly 700 square feet and we installed it in one weekend. Also, since a drip system is largely above ground (once your foliage grows-in it will be more or less invisible) it is easy to repair and rearrange.