I bought a Samsung combination fridge two months ago and I noticed the electricity bill went up quite a bit. I keep it at 4 degrees like recommended, I don't open it constantly... I'm wondering if it's a defect or if it's normal to consume this much.
The first two months a new fridge does consume more because the seals are still stiff and the internal insulation needs time to settle, but an increase that noticeable on your bill would make anyone raise an eyebrow. Try checking whether you've placed it less than 10 cm from the walls or near heat sources (direct sunlight, a hot kitchen), because if it's squeezed in it forces it to run constantly; also, make sure the coil on the back is clean of dust, which slows down heat exchange. If the power consumption stays high after you've fixed these things, Samsung should send a technician under warranty because there could be an issue with the compressor or the refrigeration circuit.
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