using little electricity, gas, etc.
- These days, one of the most important considerations in building design and the choice of building materials isย _______cy.
energy-efficiency (adj: energy-efficient)
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not harmful to the environment
- Installing solar panels to cut down on the use of fossil fuels is one of the best ways to make your homeย _____.
eco-friendly
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material used to stop heat escaping
- In cold climates, itโs important for buildings to be wellย _______ย and glass fibre is often used as roofย _____.