I'll have to dig through and find them. Most were mentioned in HVAC trade mags and other info. The only mention I can find really quick is from Energystar and they do a good job hiding it. Seems as some might not like results from actual tests instead of just going by what someones hopeful calculations were.
The tests generally show that there can be a savings in heating but not really in cooling.
http://www.energystar.gov/ia/partner...ts/Summary.pdf
That's kind of an amusing read there. The part where they mention CA residents set back their heater temp more in the winter than those in cold climates.. Well DUH it's allot colder in those cold climates and your system isn't designed to warm it up from below freezing.
The setback idea sounds good at first but as you analyze it's effects it doesn't sound as good as first thought. Got pets in the house,wood floors, wood furniture etc and the wild changes in temp and humidity wreak havoc on those. Many in the HVAC trade find these thermostats amusing as they don't work in a properly designed system. You just install it make the customer happy and go on. Then when they call and complain that the house is hot until 2am with the ac running non stop since 5pm you now can sell them either a grossly oversized unit or a regular thermostat to control their properly sized system that is designed just big enough to maintain temp and save energy.
Rant over... I'll see if I can find the names to those other studies and find links online to them.