Perhaps you misunderstood. My point is that a single thermostat can only go so far in optimizing cooling in an installation much larger than a studio apartment. A $30 programmable thermostat can probably bring you within 90% of the maximum achievable optimization for all other dwellings. And, depending on where you live, a cheap fan can quite literally bring your cooling bill from hundreds of dollars per month to $10 per month. I've done exactly that for two years as I experimented with various ideas for a renovation that is under way now.