Good question on investment property insurance. Yes, you can, of course contact your current insurer; but I will tell you if you are eligible for USAA Insurance (military affiliation or relation) they are good. Metlife also offers landlord insurance:
I have to say, people just telling you to contact an insurance agent; OMGoodness, no kidding; that's not helpful advice folks.
The main difference between a homeowners policy and investment property insurance for a single family home is that on the investment property you will be purchasing property coverage and liability coverage insurance. For quotes, you should contact an insurance broker and shop around.