Are you sure your house was built in 79? Aluminum wire was used in late 60's and early 70's. It was found in the early 70's to pose a safety hazard if connected to copper or brass screw terminals. Existing aluminum wiring in homes is considered safe if properly installed and if connected to special switches and recepticles designed for aluminum. Sorry Jack D., but according to the National Electrical Code, AL-CU labled switches or recepticles should not be used with aluminum. They were used for a short while with aluminum and copper wire, however they should not be used with aluminum wire. They pose the same safety hazard. In 1971, switches and recepticles were designed for aluminum wire and are stamped with the letters CO/ALR. This mark is now the ONLY approved rating for aluminum. Also, a switch or recpticle not specifically marked should not be used with aluminum wire. In sum, aluminum wire is safe if used only with devises marked with CO/ALR. Hope this helps and good luck.