yeah i have 4 slots available in my box so i could add 2 220 outlet. My feed from the pole is 100amps so would a 40a 220v socket work? Is it true that 220 is more efficient then 110?
Please be careful and consult with an electrician. Just because you have a 100A feed from the pole doesn't mean you have 100 amps continuously available. For example, your main breaker may only be rated for 80 amps continuously.