Google will help Nest Labs realise its vision of the "conscious" home after the search giant acquired the smart appliance firm for $3.2 billion in cash.

In a statement released by Google announcing the purchase, Google chief executive, Larry Page, said Nest's founders, Tony Fadell and Matt Rogers, had built a tremendous team that Google was excited to welcome into the Google family.

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"They're already delivering amazing products you can buy right now -- thermostats that save energy and smoke/CO alarms that can help keep your family safe," he said.

"We are excited to bring great experiences to more homes in more countries and fulfill their dreams!"

Tony Fadell started Nest after working for Apple, where he was pivotal in the invention of the iPod.

Faddel posted the reasoning behind the sale of Nest to Google in a blog post.

"Google will help us fully realise our vision of the conscious home and allow us to change the world faster than we ever could if we continued to go it alone,"

"We've had great momentum, but this is a rocket ship.

"Google has the business resources, global scale and platform reach to accelerate Nest growth across hardware, software and services for the home globally.

"And our company visions are well aligned -- we both believe in letting technology do the hard work behind the scenes so people can get on with the things that matter in life.

"Google is committed to helping Nest make a difference and together, we can help save more energy and keep people safe in their homes.