Providing a useful result while consuming relatively little energy.
Reach for it when describing performance supported by a stated energy comparison or standard
Energy-efficient windows reduced winter heat loss in the classrooms.
| playful | |
|---|---|
| everyday | |
| professional |
|
| formal |
playful
frugal with power
Fits when accessible informal explanation is useful
Careful The personifying phrase is unsuitable for specifications or certification.
everyday
Fits when lower operating cost is the practical benefit
Careful Economical may reflect cheap energy rather than lower consumption.
everyday
Fits when the design reduces energy use against a familiar baseline
Careful Energy-saving names a reduction but not the useful output used to judge efficiency.
professional
Fits when less fuel is used for travel or power
Careful Fuel-efficient is limited to fuel and may still produce high total emissions.
professional
high-efficiency
Fits when a recognized performance ratio or class applies
Careful High-efficiency needs a named metric and does not automatically mean low total use.
professional
low-energy
Fits when absolute energy demand is small
Careful Low-energy does not prove efficient output and can describe reduced performance.
formal
low-consumption
Fits when measured use should be emphasized neutrally
Careful Low-consumption is comparative and awkward without naming what is consumed.
energy-efficient appliance
The energy-efficient appliance carries a verified performance rating.
energy-efficient building
An energy-efficient building pairs insulation with controlled ventilation.
more energy-efficient
The new pump is more energy-efficient at the same flow rate.
Keep in mind
Energy efficiency is relative to useful output and does not establish low total consumption or overall sustainability.
Definitions and examples are written for this site. How words are chosen Updated
Your browser isn't saving lists, so this one will be cleared when you leave the page.