Product review (1 stars): Unreliable junk.
Unreliable at best!  I purchased this system with three sensors to keep track of a weekend home.  I wanted notification if anything went wrong.  This winter I got a notification that there were freezing temperatures in my crawl space.  Fortunately I knew this was an error because it wasn't freezing outside so I ignored it.  Then this weekend, in the middle of the night, I get an alarm that it is a negative 52 degrees in my living room.  Fortunately I was there and it was only 72.  Seriously a negative 52 in the middle of the night!  So what good is this system if it give such wild misinformation?  Worthless if you ask me.
UPDATE:  Acurite updated their platform.  This crap doesn't work at all now.  I followed their instructions for shifting to the new platform but NO LUCK!  Called and emailed for customer support and they have never responded.  This was a total waste of good money!