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Domestic routine hides continuous consumption of devices left on for hours, increasing the impact of home office on the electricity bill without immediate perception by the resident and highlighting relevant differences between types of computer and usage habits that directly influence monthly expenses.
The impact of home office on the electricity bill often hides in the routine.
Instead of appearing on a single device, it spreads among the computer, monitor, printer, and other accessories that remain powered for hours, including during breaks and after work hours.
Official materials in Brazil and the United States indicate that this set can increase domestic consumption when the monitor, printer, stabilizer, and peripherals remain on unnecessarily.
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Difference between laptop and desktop in energy consumption
Among the most common equipment on the work desk, the difference between laptop and desktop is one of the most relevant points.
The U.S. Department of Energy states that laptops use much less energy than desktop computers.
In Brazil, a guide from the National Water and Basic Sanitation Agency recommends prioritizing laptops and states that they consume less energy, while advising, in the case of desktops, to seek systems with power management.
Invisible consumption of peripherals in home office
The most frequent mistake is to look only at the main machine and ignore the rest of the desk.
When the desktop operates alongside an external monitor, printer, and accessories, the expense shifts from just the CPU to include an entire workstation.
The ANA guide states that accessories such as printers and stabilizers should not be left on unnecessarily.
On another front, the residential checklist from FEMP recommends turning off the monitor after 20 minutes of inactivity and turning off the computer and monitor when the break exceeds two hours.
This scenario gains weight because some devices continue to consume energy even when not in direct use.
FEMP maintains low standby consumption requirements for categories such as computers, monitors, and imaging equipment, and notes that common electronics can draw power in standby mode.
In its updated guidance in December 2024, the program states that when compatible models are available in the market, the purchasing standard of the U.S. federal government requires standby consumption of 1 watt or less.
Monitor left on all day increases energy expense
The monitor deserves special attention because it often remains active throughout the workday, including during short breaks, audio meetings, or times when no one is in front of the screen.
The U.S. Department of Energy states that monitors with the Energy Star label consume up to 2 watts in sleep mode and 1 watt or less when turned off.
The same agency advises enabling power management features so that the screen automatically goes into sleep mode after periods of inactivity.
In Brazil, the recommendation follows the same direction.
The ANA advises keeping the monitor’s energy-saving features activated and turning it off when not in use.
In practice, this means that an apparently harmless workstation can consume more than expected when the screen remains on with high brightness throughout the day, even without continuous use.
Moreover, the U.S. Department of Energy states that many computers come from the factory with energy-saving features available but not necessarily activated.
According to the agency, using these functions can save up to $30 per year on the electricity bill, depending on the equipment and usage pattern.
The effect is not limited to direct consumption: operating computers also release heat, which can increase the need for cooling in enclosed spaces.
Settings and habits that increase consumption
Another recurring waste is the habit of leaving the machine on for convenience.
For longer breaks, the official guidance from FEMP is straightforward: turn off the monitor after 20 minutes of inactivity and turn off the CPU and monitor when the break exceeds two hours.
In parallel, the Department of Energy recommends using sleep mode and automatic management functions to reduce the time the workstation remains consuming unnecessarily.
The idea that the screensaver helps save energy still circulates, but the official guidance goes in the opposite direction.
The U.S. Department of Energy states that savers do not save energy and can even use more than allowing the monitor to enter automatic shutdown mode.
The same material emphasizes that modern LCD monitors do not even need this feature.
This detail helps explain why two similar routines produce different bills at the end of the month.
In one, the monitor goes into sleep mode by itself and reduces consumption when the station is idle.
In the other, the screen remains on for hours with animations or moving images, without any real gain in efficiency.
Printer and accessories also impact the electricity bill
The printer also counts in this equation, even when used only a few times a week.
The ANA guide includes printers and stabilizers among the accessories that should not remain on unnecessarily.
The FEMP checklist advises unplugging devices that drain energy when not in use, citing desktop printers among the examples.
In homes where remote work, studies, and school tasks coexist in the same space, this fragmented consumption tends to accumulate silently.
A simple measure to reduce this waste is to centralize devices on a power strip or surge protector with a switch, making it easier to completely turn them off when they remain unused for long periods.
The goal is to cut the residual consumption of accessories that seem turned off but continue to draw power in standby mode.
Although the impact of each item, individually, may seem modest, daily repetition over weeks and months turns small consumptions into fixed costs.
Energy efficiency influences computer choice
When it comes time to replace equipment, energy efficiency is no longer a technical detail and starts to influence usage costs.
The official Energy Star website states that certified computers use about 30% to 40% less energy than standard models, while the U.S. Department of Energy mentions a range of 30% to 65%, depending on usage.
In Brazil, the Ministry of Mines and Energy highlights that the Brazilian Labeling Program informs the energy performance of machines and equipment and seeks to guide more conscious purchases.
Therefore, the choice between laptop and desktop is not limited to mobility, screen size, or processing power.
For those who work every day in front of the computer, with an external monitor, video conferences, multiple tabs open, and connected peripherals, the more economical equipment tends to reduce not only direct consumption but also the overall burden of the entire workstation on the electricity bill.
At home, the villain is not always in the intense use of a single device, but rather in the silent sum of those that stay on the desk and remain powered throughout the day.
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