wireless monitoring - need suggestions please

I'm wanting to add some wireless monitoring of temperatures and power on various devices throughout my brewery and I suspect someone on this list is up to date on the technology which would work well and be a good low cost starting point. I am mostly looking for guidance on the best board to use for interconnect. I will take care of the programming and any hardware modifications and/or additions. Is zigbee what I want? I have fermenters, chillers, condensing units coolers, etc throughout the building, so minimally one or so A/D inputs and possibly a couple of digital inputs on the board should suit my needs. In the long run I want to check on status from my smartphone as well as have the system alert me if there is an alarm condition. If the "base station" is either connected to our local network or plugs into a PC/mac, that should be workable. Thanks in advance... --tom