Generally speaking, anyone who owns residential property regardless of size (i.e., 1 and 2 family homes, multifamily buildings, apartments, and townhouses, etc.) that contains fossil burning fuel equipment (i.e., oil, gas, wood, etc.) or contains enclosed parking (i.e., attached or enclosed garage), is required to install carbon monoxide (CO) alarms by August 1st, 2008. In certain limited instances, the installation requirements are deferred until January 1, 2007.