Why Energy Myths Persist — and What They Cost
Energy-saving advice circulates through neighborhoods, social media, and well-intentioned relatives — and some of it is simply wrong. The problem isn't just that these myths don't work; acting on some of them can quietly increase your electricity bill while you believe you're being responsible. Understanding the actual physics behind how your home uses power is the first step toward genuinely reducing costs.
The myths below are among the most widely repeated in American households. Each one is corrected with straightforward reasoning so you can make smarter decisions without needing an engineering degree. If you're also interested in how misconceptions operate in other areas of home ownership, our piece on common myths about homeowners insurance coverage applies the same fact-checking approach to a topic that catches many families off guard.
Myth
Leaving a ceiling fan running all day keeps the whole room cooler, even when no one is in it.
Fact
Ceiling fans cool people through a wind-chill effect — they do not lower room temperature. Running one in an empty room wastes electricity.
Fans move air across skin, which speeds up evaporation and makes occupants feel cooler. They have no effect on the air temperature itself. The U.S. Department of Energy recommends turning ceiling fans off whenever you leave a room, and raising your thermostat a few degrees when fans are in use — a combination that can reduce cooling costs without sacrificing comfort.
Myth
Turning lights off and on repeatedly uses more electricity than just leaving them on.
Fact
The energy used during a light's startup is negligible. Turning lights off — even briefly — always saves more energy than leaving them on.
This myth originated with older fluorescent tube lighting, which did experience slight wear from frequent switching. Modern LED and CFL bulbs are not meaningfully affected by switching cycles. The energy used in the fraction of a second at startup is far less than what a bulb consumes running for even a minute. The practical rule: if you're leaving a room for more than a few seconds, switch the light off.
Myth
Electronics and appliances don't use power once they're turned off.
Fact
Most plugged-in devices continue drawing electricity in standby mode, even when switched off. This is called phantom load or vampire draw.
Televisions, gaming consoles, microwaves, chargers, and many other devices remain partially active when 'off' — maintaining clocks, waiting for remote signals, or simply staying warm. Individually the draw is small, but across a household full of devices it adds up. Plugging devices into power strips you can switch off, or unplugging items not in regular use, is an effective countermeasure.
[important_callout]Myth
Cranking the thermostat way up (or down) heats or cools your home faster.
Fact
HVAC systems work at a fixed rate regardless of how extreme the thermostat setting is. Setting it to an extreme temperature doesn't speed up the process — it just overshoots your target.
A furnace or air conditioner delivers conditioned air at the same pace whether the target temperature is 5 degrees away or 20 degrees away. Setting the thermostat to 85°F on a cold day won't heat the house faster than setting it to 70°F — it will just keep the system running longer, consuming more energy, and likely leaving you uncomfortably warm. Set the thermostat to your actual desired temperature and let the system do its job.
Myth
Closing vents in unused rooms saves energy by redirecting airflow.
Fact
Closing vents can actually put strain on your HVAC system and reduce its overall efficiency.
Central HVAC systems are designed to operate with a balanced load across all vents. When vents are closed, pressure builds in the ductwork, forcing the system to work harder and potentially causing air leaks or blower motor stress over time. If you want to reduce energy use in certain zones, consult an HVAC professional about zoning systems designed for that purpose rather than improvising with closed vents.
Myth
An energy-efficient appliance will always lower your utility bills.
Fact
Efficient appliances only reduce bills if they replace a less efficient model you would have used anyway — or if your usage habits don't expand to offset the savings.
This is sometimes called the rebound effect: when something becomes cheaper or easier to use, people often use it more, eroding the expected savings. Buying a high-efficiency washing machine, for example, only saves energy if it replaces a less efficient one and if you don't increase your weekly wash loads significantly. Efficiency improvements are real, but their impact depends on actual usage patterns. For a closer look at rising household costs, see why your utility bills keep climbing even when your habits seem unchanged.
Practical Steps That Actually Reduce Energy Use
Once you've cleared out the myths, a handful of straightforward habits make a meaningful difference:
- Use a programmable or smart thermostat correctly. Set it to lower heating or cooling automatically during hours when the home is empty or everyone is asleep. Consistent scheduling is where the savings come from.
- Seal air leaks around doors, windows, and outlets. Drafts and gaps in the building envelope are among the most cost-effective problems to fix, often using nothing more than weatherstripping or caulk.
- Audit your standby devices. Walk through your home and identify what stays plugged in around the clock. A single smart power strip in an entertainment center can address several phantom loads at once.
- Check your water heater temperature. Many factory settings default to 140°F, but 120°F is sufficient for most households and reduces energy use and scalding risk simultaneously.
For those who want to go deeper on device-level efficiency, our guide on maintaining your devices for longer life covers habits that reduce both energy draw and replacement costs over time. Similarly, electrical safety myths that affect American homes are worth reviewing alongside energy habits — the two topics overlap more than most homeowners expect.
5–10%
Of home electricity from phantom load
According to the U.S. Department of Energy, standby power from plugged-in but inactive devices accounts for a meaningful share of residential electricity bills.
~$11B
Annual U.S. cost of standby power
The Lawrence Berkeley National Laboratory has estimated that standby power collectively costs American consumers billions of dollars each year in wasted electricity.
The content on this site is for informational purposes only and is not a substitute for professional advice. Always consult a qualified professional for guidance specific to your situation.