The kids are mixed. My 8th grader doesn't want to leave but my 6th grader says sure! DS11 could make friends with a cardboard box while ds14 is more of an introvert.
Ditto on Colleens's sentiment. For us at this point in our life, the best place to live is behind our own front door.
We moved to the Chicago suburbs when oldest DS was 10 1/2 and halfway through 5th grade. It was absolutely awful. The boys in DS's new school were at the age where they were concerned with being "popular" and one "cool" kid was absolutely horrible to my DS, scaring his herd to not want to make friends with DS either. And DS is not exactly an introvert - not the life of the party, but certainly not afraid to join in or lead, is smart and athletic, and walked into his new classroom the first day smiling and hi-fiving everyone crowding around the door to see the new kid. 2 weeks later, he was in tears every day and for the next 6 months (the bullying followed him into Middle School for some of his 6th grade year) his grades dropped, he hated school, didn't want to join in any activities, and cried just about every night. Granted, it was due to the stars crossing that he just happened to be put in the 5th grade class with this jerky kid who was threatened that my son might take this kid's friends away and did everything he could to ostracize him and put him down, and it doesn't mean it will happen to your kids, but we decided (even though we don't really love this area for various reasons) that we will not move again out of this school district until all three kids have graduated high school. (youngest DS will be finishing 6th grade when DS14 graduates)
If you have lived in the same place for your kids' whole life, you may not know what it is like to have to start over being the "new kids' - even as parents, it is difficult at their ages because many of the kids in your new area will have been friends since preschool, hence, the parents will all know each other too and from what we have seen, many have no desire to make new friends outside their circle, nor do parents generally come into contact with other parents as much since the kids are more independant. We were lucky in that my younger two were still in preschool and first grade when we moved, so we were able to meet new families, plus DH and I are very involved in all of our kids' schools and sports, so we have met people that were kind of "forced" LOL, to talk to us since we are coaches or room parents. I won't lie, though, that we have way less friends who are parents in my DS14's age group than the younger kids. Football is heavily parentally involved even through high school, so that has helped. If my son wasn't a football player, I wouldn't know 90% of who I know in his high school.
Anyway, that is our experience - no amount of sun or warmth will sway me from taking my kids out of their environment again. We will suffer the high taxes, high home prices, school fees, traffic, cold and snow, and house and yard a quarter of the size of my sister's Michigan house for the same price until my kids are in college and out high school. 9 1/2 years to go!
Good luck with whatever you decide!
ETA: If your high schooler plays sports, make sure you check to see what the waiting period is at a new school. At DS's high school, and all the schools around here, transfer students have to sit out a season before they can play again. And since football was what saved my DS14 from believing the bully's awful words and actions when we first moved, I would never make my kids move then take a sport away from them at the time it is most cricial that they find somewhere to join in and get to know other kids. I never understood that...I get the whole "recruiting" and "stealing from other schools" problem, but it's the kids who are new that need to be included the most!