You thing that hosting is meter about SEO ? I want to change host from USA to Canada Is there anything that perhaps influence our rankings ?
The only difference will be the country of origin in local searches. But unless you also have the TLD for that particular country, I wouldn't worry too much about it. (I have US based sites hosted on servers in Canada for example - no problems or issues whatsoever. Just had to set the "preferred country/region" to the good ole' US of A in Google's Webmasters' Central.)