You can make noiseless calls using Krisp with Google Hangouts.
After you download and install Krisp, configuring Google Hangouts is super simple.
1. Start a Google Hangouts call
Start a call in Google Hangouts
2. Select Krisp as Microphone and Speaker
Open Google Hangouts call settings and select Krisp as Microphone and Speaker.
3. Mute the noise
Choose the correct microphone in Krisp menu. Make sure that Mute Noise toggle is turned on in Krisp UI.
The "in use" indicator will be On if there is an ongoing call.
Here's a quick video tutorial to help you along the way
Krisp with Google Hangouts on Mac