Meet Your 5 Biggest Energy Hogs
And read about 20 ways to beat 'em, with everything from easy fixes to 'go nuts' investments.
Watt Stopper sensors used throughout this residence can control the lights just like a normal switch, but incorporate passive infrared technology that allows the switch to detect absence or presence in a room.
October 15, 2010 by Steven Castle

Get really serious: A gas-fueled tankless water heater, which uses high-powered burners to quickly heat water as it runs through a heat exchanger, can be 22 percent more energy-efficient than standard gas-fired storage-tank models, according to a Consumer Reports test. “That translates into a savings of around $70 to $80 per year, based on 2008 national energy costs,” the magazine reports. Unfortunately, payback could take up to 20 years, and reviews of the models are mixed. Nevertheless, you’ll find tankless water heaters in many new green homes.

Go nuts: Look into having solar thermal system installed. This type of system uses heat from the sun to warm water, largely for domestic hot water use. Most houses can get buy on a couple of solar thermal panels, tied to a solar thermal water tank. Solar thermal systems can cost about $8,000, but you’ll get more bang for your buck than you would with a more expensive solar electric system—especially if you’re presently heating water with gas or oil. Federal and state tax incentives exist for buying solar thermal, as well. With present tax incentives, you could save 30 percent or more on the cost of these systems.


Yep, lighting uses about 11 percent of your home’s total energy draw—especially those big floods you may have out front. But it’s also the little things that add up: the light left on in the garage or closet all day, kids leaving their bedroom lights on. It doesn’t seem like much, but it can drain your wallet pretty fast. There are many things you can do to cut back.

Easy fix: Replace some of your lights with compact fluorescents. Yes, many people don’t like CFLs—and with good reason. The color of the light often seems cooler than the color of good-old “warm” incandescents, though CFLs have improved greatly. For a “warmer” or “softer” light, look for CFLs with color temps in the 2,700 to 3,000 Kelvin (K) range. And put them in places like closets and the garage, where you’re not as concerned about ambiance—and if they do get left on for a few days they won’t use as much electricity as incandescent bulbs.

Get serious: Install some dimmers and occupancy sensing lights. Dimmers are inexpensive fixes for incandescent and halogens light fixtures. Dimming a bulb by just 15 percent, which is hardly noticeable, can save you about the same on your electric bill. And occupancy sensors are great for bathrooms and kids’ rooms. When the sensor detects that no one is in the room after a certain amount of time, it simply shuts off the light.

Get really serious: Invest in LED (light emitting diode) lamps. They are the future of lighting, and they are now ready for prime time. Good-quality LEDs will last years, and they are 90 percent more efficient than incandescent lamps, many of which will be phased out of production starting in 2012 (100-watters are first). Dimming LEDs can be an issue, but more and more solutions are becoming available. Just don’t buy the cheap stuff. A decent LED lamp to replace a 60-watt bulb can cost $40 to $60—and if a price looks too good to be true, it probably is.

Go nuts: Get a lighting control system. This will allow you to set scenes, which incorporate only the lights you need for a particular activity—like watching movies or reading. One scene could even put your home in low-light state. Most lighting systems can be tied to security and home control systems, so many lighting presets can be triggered automatically at prescribed times of the day or when the security system is armed, for example. Try to add as many LEDs to the system as possible, especially for exterior lighting.

Computers and Electronics

We knew this was lurking, didn’t we? Yes, your electronic devices constitute another 9 percent of your utility bill. And some of the biggest energy bandits in this category are big-screen TVs. Thankfully, TVs are getting more and more efficient, and yes, there are easy and expensive ways to save even more.

Easy fix: Use the power management settings on your computer. Put that sucker to sleep after 15 minutes of inactivity—and the monitor, too. (Too many people leave their computers on all night.) You can save about $60 a year just by using your power management settings, according to web site Climate Savers Computing. Some newer TVs also have energy-saving settings. And be sure to take you TV out of the super-bright and saturated “torch” mode used in retail settings. This will not only minimize the amount of electricity you TV uses, but also improve the picture quality.


Get serious: Plug your electronics into surge-suppression strips, and switch off the strip when you’re not using the devices. This will effectively cut power to your electronics and prevent them from using vampire power, which is the electricity devices consume when they are “off” or in “standby.” Many homes can have 40 or more of these power vampires, robbing you of your hard-earned cash (to the tune of 5 percent to 10 percent of your electric bill.) If it’s too much to switch something off, or you’re afraid you’ll forget, smart surge suppressors are available for both computer and home theater gear. You plug a computer or TV (or receiver) into the master outlet, and when it goes to sleep or shuts off, connected devices like printers, computer speakers, DVD players and the like power off as well. Money is saved. A smart surge suppressor generally costs less than $100.

Get really serious: Buy Energy Star-rated TVs, or specifically, LED TVs, which are LCDs backlit by energy-saving LEDs instead of the usual fluorescent backlights. There are edge-lit LEDs that use LEDs only on the sides of the picture, and full backlit panels, most of which can dim parts of the picture to save even more energy. (The latter is called local dimming.) This dimming feature won’t impact the picture quality. In fact, you’ll likely get a better picture from an LED TV than a fluorescent-lit LCD. If you must have plasma, sets from Panasonic are proving to be quite energy-efficient, as well. Yes, you can get an Energy Star-rated plasma TV.

Go nuts: Invest in an energy monitoring system that provides real-time feedback of your electricity use. (People with immediate feedback typically save 5 percent to 15 percent on their energy bills.) You can even get circuit-level energy usage information from a product like Powerhouse Dynamic’s eMonitor (it costs a few hundred bucks and a monthly subscription). For several thousand, step up to a commercial-grade Agilewaves system, and you can monitor gas and water consumption, as well as solar energy production. Add a home control system that works with the energy monitoring system to turn things on and off automatically, and you can save up to 30 percent. And don’t forget to add power conditioners with individually controlled outlets to preclude devices from drawing unnecessary vampire loads, and have them governed by the control system.

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Steven Castle - Contributing Writer
Steven Castle is Electronic House's managing editor. he has been writing about consumer electronics, homes and energy efficiency topics for two decades. He is also the co-founder of GreenTech Advocates.

What Uses What?

Here are some examples of energy use of various household appliances, according to the U.S. Department of Energy. All figures are in watts.
Aquarium = 50–1210 Watts
Clock radio = 10
Coffee maker = 900–1200
Clothes washer = 350–500
Clothes dryer = 1800–5000
Dishwasher = 1200–2400 (using the drying feature greatly increases energy consumption)
Dehumidifier = 785
Electric blanket- Single/Double = 60 / 100
Ceiling = 65–175
Window = 55–250
Furnace = 750
Whole house = 240–750
Hair dryer = 1200–1875
Heater (portable) = 750–1500
Clothes iron = 1000–1800
Microwave oven = 750–1100
Personal computer
CPU - awake / asleep = 120 / 30 or less
Monitor - awake / asleep = 150 / 30 or less
Laptop = 50
Radio (stereo) = 70–400
Refrigerator (frost-free, 16 cubic feet) = 725
Televisions (color)
19” = 65–110
27” = 113
36” = 133
53”-61” Projection = 170
Flat screen = 120
Toaster = 800–1400
Toaster oven = 1225
VCR/DVD = 17–21 / 20–25
Vacuum cleaner = 1000–1440
Water heater (40 gallon) = 4500–5500
Water pump (deep well) = 250–1100
Water bed (with heater, no cover) = 120–380

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