Google's acquisition of Nest has officially been completed, following announcement of the deal in mid-January and subsequent regulatory approval.

A filing with the SEC on Wednesday revealed the deal was officially closed for $3.2 billion on 7 February, meaning Google now has the Learning Thermostat, Protect smoke and carbon monoxide detector, and a slew of ex-Apple employees in-house. 

"We expect that the acquisition will enhance Google's suite of products and services and allow Nest to continue to innovate upon devices in the home, making them more useful, intuitive, and thoughtful, and to reach more users in more countries," Google said in the regulatory filing. 

The company has said in the past it will let Nest continue to operate and won't interfere, instead offering it resources to grow globally. Google declined to comment further on the deal when contacted by email on Wednesday.