As long as your URL stays the same, your site's listing in Google shouldn't be affected if you switch hosting companies or change your IP address. We recommend migrating a site to a new IP address with the following steps:
- Bring a copy of your site up at the new IP address.
- Update your nameserver to point to the new IP address.
- Once you see search engine spiders fetch pages from the new IP address (typically within 24-48 hours), it's safe to take down the copy of your site at the old IP address.