Net Promoter is popular with customers because it is short and simple to understand. But simply running a Net Promoter survey does not guarantee a high response rate.
To help put you on the path to Net Promoter survey response rate greatness, here is a list of inside tips and tricks used and refined by numerous CustomerGauge users. Each one will incrementally increase response rates.
You can see a full write-up of these points at this post: Boost your Net Promoter survey response to 60%+!