When we work with clients we create a Home Manual Binder. Using sleeves with pockets and tabs, we organize by areas of the home. In the front of the binder service providers are kept for easy reference.
Keep your binder in your home office or possibly utility room. Where ever you have the room and it is easy to find when the reference manual is needed. And as for karma, when you move the new home owners will really appreciate the binder you hand over to them!