We claim:1. A housing for containing and protecting a control unit for a home security system, wherein the control unit includes a shell that contains data handling and transmission mechanism, the shell having a predetermined shape, the shell also having a top portion containing a user interface;the housing comprising:a base wall configured for attachment to a wall or similar vertical surface and also configured to lie upon a horizontal surface;a side wall configured to form a cavity to accommodate and enclose the shell of said control unit, with at least a portion of said side wall having been treated or configured to permit sound and ventilation therethrough; anda cap portion positioned on said side wall opposite said base wall;with one of said side wall and cap portion being configured to form a snug fit onto said control unit within said cavity; andsaid cap portion having a window opening formed therein aligned with the user interface on the top portion of said shell and configured to provide user touch access through said window opening to said user interface, and wherein said window opening is of smaller diameter than the top portion of the shell of said control unit.2. A housing for a control unit for a home security system according to claim 1, wherein said base wall has a top portion and a bottom portion, considered when the base wall is attached to a wall or similar vertical surface; and comprising a power cord opening through said top portion and a channel groove therein extending transversely from said top portion to said bottom portion, said channel groove being configured to accommodate said power cord when the base wall is attached to said wall or similar vertical surface so that the power cord exits downward from the bottom portion of said base wall.3. A housing for a control unit for a home security system according to claim 1, wherein said base wall is removably fastened to said side wall at a base opening in the sidewall, and said housing is configured to receive the control unit through said base opening.4. A housing for a control unit for a home security system according to claim 1, wherein said side wall has a proximal opening at a proximal end thereof to receive said control unit and said cap portion is configured to fit into or onto said side wall over said front opening.5. A housing for a control unit for a home security system, wherein the control unit includes a shell that contains therewithin data handling and transmission mechanisms, and the shell having a predetermined shape, the shell also having a top portion containing a user touch interface; the housing comprising a main portion having a base wall suited for attachment to a wall or similar vertical surface, a side wall configured to contain and accommodate the shell of said control unit, with the side wall of the main portion having been treated or configured to permit sound transmission and ventilation therethrough, and a cap portion that fits into or onto said main portion and forms a snug fit over said control unit and within an upper or forward end of the side wall of said main portion, and the cap portion having a window opening formed therein to permit user touch access through said window opening to said user interface and wherein said window opening is of smaller diameter than the top portion of the shell of said control unit.6. The housing for a control unit according to claim 5, wherein said control unit is generally of a cylindrical or frustoconic shape with a base that bulges to be wider than the top or front thereof, and wherein said lower portion side wall is of a cylindrical form, and wherein said cap portion has generally cylindrical geometry to fit snugly into the cylindrical-form side wall of the main portion.7. The housing for a control unit according to claim 6, wherein said cap portion includes a ring of a resilient material on an inner surface of the cylindrical-form side wall thereof.8. The housing for a control unit according to claim 5, wherein the side wall of the main portion has a plurality of perforations therein configured for permitting sound and ventilation to pass through.9. The housing for a control unit according to claim 5, wherein said window formed in said cap portion includes a round opening of smaller diameter than the top portion of said shell.10. The housing for a control unit according to claim 5, wherein said housing is formed of a rigid or semi-rigid plastic resin.11. The housing for a control unit according to claim 7, wherein said resilient material includes a plastic foam material.12. The housing for a control unit according to claim 5, wherein said base wall has a top portion and a bottom portion, considered when the base wall is attached to a room wall or similar vertical surface; and comprising a power cord opening therethrough in said top portion and a channel groove therein extending transversely from said top portion to said bottom portion and configured to accommodate said power cord so that the latter exits downward from said bottom portion.