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If your current gas fireplace needs a makeover, gas inserts can give you the customized look and heating efficiency that you’re looking for. These metal box fireplaces simply slide into your existing brick or metal fireplace and come in many different sizes and styles. Traditional open fireplaces are highly inefficient- as low as a 15% rating and may actually pull heat out of your house. However, with a modern gas insert, you can reliably heat a mid-sized house and enjoy an efficiency rating of up to 86%, saving you money in the long run.