Remember the days when you felt a chill in your home and had to manually adjust the wall thermostat's temperature? Thanks to the Nest thermostat you can simply open an app on your smartphone to control the temperature -- but then again opening apps by hand is so yesterday. Now, you can control a smart Nest thermostat with your voice.

Google acquired Nest for $3.2 billion earlier this year and the tech giant has not wasted time integrating Nest functionality into Google Now.

It is easy to use, reports TechCrunch; simply speak the temperature change you want into your smartphone with the authorized app. Google Now will display a card when Nest's automated control settings kick in so you know it is working.

To use the app, users will need to purchase Nest and install it. One can buy the Nest home thermostat at Nest, Home Depot, Lowe's, Amazon or Best Buy for $249.00.

Next, opt-in on your Nest account to activate it. Google does not turn it on by default.

It is important to note that the system-wide voice functionality will work only on Android currently because of Google Now. If you use iOS, you can still use the voice commands through the Google app.

How to Set Up Voice Control of the Nest Thermostat

Engadget reports that users must authorize both the Google app and its voice control separately.

Once this is done, a simple voice command, such as, "change the temperature to 72 degrees" is all that is needed to make a temperature adjustment.

An even cooler feature is that the temperature adjustment will be made based on your phone's location. If you are driving home from work, Google Now will show a card letting you know Nest is making your home comfy for your arrival. The new feature works on both Android and iOS.

If you need help setting up your smart thermostat, use the handy Nest guide.