Unfunded needs include the costly replacement of aging heating and ventilation systems with energy-efficient models.

Your energy consumption - for example, could you replace equipment with newer, more energy-efficient or less polluting models?

Honda provided few details, except to say it was working on a highly energy-efficient compact model that would be introduced "in the near future."

When replacing computers, purchase new energy-efficient models that use less energy.

This grill will wow you with its performance, and it is an energy-efficient model as well.

But if it's an energy-efficient model, it will give you some savings on your next tax return.

Unfortunately, current energy-efficient models do not suit the needs of most families.

Conserving energy during the gliding phase makes this a more energy-efficient model.

The most energy-efficient models are the ones with sensors.

In Phase 1, the mansion's appliances will be replaced by energy-efficient models.