Residential equipment can be simple or complex depending on the owner’s needs. Residential needs differ from commercial needs in the amount of coverage that one usually requires. The principles are the same; the owner must decide the priorities and needs. For example, if the residential system covers a multi-unit location the needs may be similar to a commercial location with an emphasis on personal security and property protection. If a single family residence, there may be fewer needs and the emphasis might be on interior space and watching children.