Energy-efficient
adj.capable, thoughtfulprofessional
What it means
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.
Choose between these
7- playful
frugal with power
when accessible informal explanation is useful
not when The personifying phrase is unsuitable for specifications or certification.
- everyday
when lower operating cost is the practical benefit
not when Economical may reflect cheap energy rather than lower consumption.
- everyday
when the design reduces energy use against a familiar baseline
not when Energy-saving names a reduction but not the useful output used to judge efficiency.
- professional
when less fuel is used for travel or power
not when Fuel-efficient is limited to fuel and may still produce high total emissions.
- professional
high-efficiency
when a recognized performance ratio or class applies
not when High-efficiency needs a named metric and does not automatically mean low total use.
- professional
low-energy
when absolute energy demand is small
not when Low-energy does not prove efficient output and can describe reduced performance.
- formal
low-consumption
when measured use should be emphasized neutrally
not when Low-consumption is comparative and awkward without naming what is consumed.
Said against
3- energy-intensive
- wasteful
- inefficient
It naturally appears in
3- 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.
Usage notes
Energy efficiency is relative to useful output and does not establish low total consumption or overall sustainability.