The English language Goodle web page to which Mark referred is indeed puzzling, but the mystery is easily resolved if you know a bit about Korean language and culture. 온들 [ondɯl] "warm stone" is the traditional Korean heating system, a kind of hypocaust. In its original form, a wood fire was built in a fireplace like the one shown in the photograph and used to heat a wide stone called a 구들장 [gudɯlʤaŋ] under the floor of each room. One virtue of this system is that the stone has a large heat capacity and so stores up heat from the fire and releases it gradually, making the temperature of the room insensitive to the state of the fire. A variant uses a number of smaller stones with a layer of mud over them. A still later version uses water in a network of pipes embedded in concrete, a system which I believe was a favorite of the American architect Eichler. This company manufactures what they promote as a new, improved, pre-fabricated heating system derived from the traditional 온들. The term goodle is presumably an anglicization of 구들 [gudɯl], a synonym for 온들. The company very likely chose this term in an attempt to play on the English word good as well.