A "house" is essentially a container -- for a person, a family, several families or even a large group with shared interests (think of the term "houses of worship.") In the Bible, a "house" is also a container, but for spiritual things rather than natural things. In various uses a "house" can represent part of the mind, the whole mind, a whole person or even a church. The other nuance to the word "house" is that it is generally used in regards to our affections and desires rather than our thoughts and principles. This makes sense; we tend to engage our thoughts and rationality when we are out in the world doing our work, but when we are inside our houses we are driven most by love for our families and the desire to be good to those we love. So "house" tends to represent the things we want and care about -- which are ultimately the things that define us.

271. Arrayed in white garments, signifies all truths from good in the lower heavens. This is evident from the signification of "white garments," as being truths that invest, which specifically are true knowledges [scientifica] and cognitions (See above, n. 195, 196, 198); and because the lower heavens are in these truths, they are meant.

That "white garments" signify the lower heavens may seem strange to those who know nothing about appearances and representatives in heaven. All in the heavens are clothed according to truths, and lower truths correspond to garments, and because the lower heavens are in these truths, therefore the garments of the angels in the higher heavens also correspond to these. (But this arcanum may be more clearly understood from what is said and shown respecting the Garments in which the Angels are Clothed, in the work on Heaven and Hell 177-182; likewise from what was represented and signified by the garments of Aaron and his sons, explained in Arcana Coelestia 9814, 10068; as also by the garments of the Lord when He was transfigured, n. 9212, 9216)