Hi everyone im trying to figure out what could be the problem with my town&country 2011

The issue is after the van warm up around 200f and up the idle get high around 900-950.right now the average temp on my area is 112f so my van idle around 950 with a/c on at 1,000 rpm all day.
on the winter idle around 650-700 all day no matter the temp outside
i have never had a car that idle so extremely high
any car i used to own stay flat at 650 rpm max even with a/c on all year long.
Can anyone point me on the right direction to fix this problem.thanks in advance