Most homes and newer and decent apartments will have 220V [technically, 120/240V], if they have either an electric dryer, water heater, stove, or individual A/C units. If you live in an apartment, be sure to get the landlord's OK, and be prepared to use HIS electrician, or you could find yourself holding an eviction notice..right quick!
converting from 110 to 220
well, not actually converting...but i know a few online memebers in the states that have run dedicated 220v lines for their gear. I currently have 2 dedicated 20 amp 110v lines. The gear is linn which is said to run far better on a 220 line. I live in a townhouse, ran the 2 lines myself...but what exactly is involved in running 220v lines?