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.

4939. Once when I had been raised up to heaven it seemed to me as though my head was there, but that my body was below it, and my feet even further below. From this I had a perception of how the higher and lower things present in the human being correspond to the same in the Grand Man, and how one flows into another; that is to say, how the celestial, which is the good of love and the first degree of order, flows into the spiritual, which is truth springing from that good and the second degree of order, and then into the natural, which is the third degree of order. From this it is evident that natural things are like the feet on which the higher things support themselves. What is more, things in the spiritual world and those in heaven are ringed about by the natural world. Consequently the whole natural system is a theatre representative of the Lord's kingdom, every individual part of it being representative, 2758, 3483. The natural system is kept in being by an influx conforming to that order, and without this influx it could not remain in being for even a single moment.