Eighteen months ago, it looked as though Google was preparing to offload Nest, its rather expensive acquisition that still likely hasn’t seen a return on its investment. This week, it was confirmed that Google is holding onto Nest, but bringing it back inhouse. The news came as Control4 and Crestron announced new offerings in the professional installation space – one that will remain lucrative, but does not promise the scale that retail or operator channels do. Control4’s new CA-1 Automation Controller is aimed at installers looking to provide customers with comprehensive smart home installations and supports WiFi, ZigBee and Power over Ethernet. Crestron, another veteran (since 1971) has announced a partnership with Google to integrate its home automation line with…