I help factories become more productive by refining the way they operate. Small improvements over time can lead to big changes in the long term. But it wasn't until I arrived home late and exhausted from a trip that I realized I needed to use these same principles at home.
In times past, most people heated their houses using fireplaces, stoves and coal furnaces. Some people still do. It makes no difference which of these forms of heating one uses, there are always ashes or clinkers to get out of the house and hauled away without leaving a mess behind.