Most people usually look for a fixed rate as soon as they choose to purchase.
Mostly because of security. Having an interest rate locked for 30 years protects them against uneasy markets which could lead to higher interest rates. Although a 30 year Fixed rate mortgage may offer you security, it costs you more if your not planning on living in the home for more than 15 years. Plus, interest rates on Fixed Rate Mortgages are higher than they would be on Adjustable Rate Mortgages. In other words, when you buy a house, be conscious of how much time you plan on living there.