most homes have both 120v and 220v AC. The 220v is mostly for appliances such as Stoves, Water Heaters, Electric Heat, Central Air Conditioning large window AC's, and in the home shop, certain tools such as HD table saws, etc.
Isn't the 220v supply actually closer to 208v derived from connecting across two of the three phases rather than one phase to neutral?
"People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.