If you are visiting Sweden and are a citizen of a non-EU country, you may need a visa. A visa is a permit to travel to and stay in a country for a maximum of 90 days.If you intend to stay in Sweden for longer than 90 days, you will need a visitors’ residence permit.
For more information, Going to Sweden? - Sweden Abroad
Please note that the Consulate General in Houston do not handle questions nor issue any visas or permits. Instead please contact the Embassy of Sweden USA, Washington - Sweden Abroad