I had 2 electricians come to give me quote. My panel is full, all breakers used. Only other heavy load is electric dryer, my range is gas. No a/c. Panel to outlet would be about 40-50 feet. One electrician says he can most likely double up and not need sub panel. Other one quotes with sub panel. Quotes could not be more disparate. 1st one is $500 and the other one is $1325. How can they be so different?