At Coolblue, you can pay for energy-efficient products with EcoCheques. Get yourself some SpeedComfort or BlueBuilt radiator fans, for example. You place a radiator fan under your radiator, so the heat spreads throughout your home faster. You use less energy this way, which is good for the environment and your wallet. You can trade in Edenred, Pluzee, and Monizze EcoCheques both in our stores and on our website.