Another factor is that you were probably carrying coverage for your personal belongings when you lived there in addition to coverage on the structure itself. Now that you're not living there, you can drop the personal property coverage which should save you some money. I would imagine that your insurance agent knows all about this, but... you never know, so double check. That's my two cents.
To bump my contribution to four cents ;-) I'd just encourage you to shop around. Insurance is just like anything else that you shop for. Some policies are better than others. Some policies are more/less expensive than others. Some companies will give you better service than others. Make a few calls, and you'll see what I mean. If I were you, I would shop (get quotes from) among a few different independent brokers who have access to lots of different carriers. That should help you find the best deal. Just be sure as you're shopping that you're comparing "apples to apples" on the coverages between the various policies that are presented to you.
Happy Shopping!