Please forgive me, not really sure where to post this subject. I've been shipping eggs up until a few days ago when our temps are so cold (down in the teens at night) I dont feel comfortable doing so. What I've been told is to send them with heat packs, and I tried it for the first time today. My question is, is there anyone like UPS who can guarantee delivery where temps arent below freezing in truck, and do any of you know where I can get heat packs that last more than just 'hours'??? Any help or additional info would be MOST appreciated. Blessings!