I do my own black and white, plan to get back into color but reluctant because I don't have enough time to do the black and white I shoot. Send color out, so far to Dwayne's but open to changing (no problems with their processing but I've been getting scans back which are inconsistent - just need to get a V700 and be done with that.)
Just send it out. Never had a problem. I won't worry about the temperature either. At most it's three days. That's not going to hurt it.