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SAN FRANCISCO – When our Internet-connected gadgets and home appliances all learn to talk to each other, Google wants to be at the center of the conversation.

This imagined future is still a few years away, but Google is preparing with its $3.2 billion acquisition of high-tech thermostat and smoke-detector maker Nest Labs.

The surprise deal announced earlier this week will provide Google Inc. with more tools to build a valuable hub for homes. It’s a world of network-tethered toasters and tea kettles, or a so-called “Internet of Things,” that is destined to reshape society, experts say, in the same way that smartphones have done in the seven years since Apple Inc. unveiled the iPhone.

The research firm Gartner Inc. expects more than 26 billion objects to be connected to the Internet by 2020, a figure that doesn’t include personal computers, smartphones or tablets. That would be a nearly 30-fold increase from roughly 900 million Internet-connected things in 2009.

Google established itself as an instrumental player in smartphones with the 2008 release of Android, a free operating system that runs on more mobile devices than any other piece of software. Now, the company is gearing up for the advent of the smart home with the help of Nest Labs, a 300-employee company started in Palo Alto, Calif.

As influential as smartphones have become, their role in understanding people’s habits and preferences could be eclipsed once everything in the home has a computer chip and is connected to the Internet.

“Google bought Nest in order to learn about this world where even more information is going to be accessible by computers,” said Forrester Research analyst Frank Gillett.

Nest Labs quickly won over gadget lovers with its 2011 release of an Internet-connected thermostat that learns to cool and heat homes to suit the needs of the inhabitants. Late last year, the company followed up with a smoke and carbon-monoxide detector equipped with voice technology and the ability to communicate with the company’s thermostat. Nest hasn’t said how many of its devices have been sold, though analysts believe they are in just a small fraction of homes. The products have only been available in the U.S., Canada and the United Kingdom.