Are we over-cooling ourselves?Having lived there I can tell you that the tropical highlands is the climate zone best suited to the human body.1)See for example the weather in Guatemala City , 60-80F, and its like that all year long. So unless humanity makes a mass migration to these zones, we are going to keep modifying our climatic habitats. For all the hate it generates, cooling uses far less energy than heating does  in the USA.2)This is a point I hope to delve into more deeply in the future. As far as the Europeans using A/C less, that can mostly be attributed to a far cooler climate , but I would also add that their much older building stock makes HVAC very difficult while their smarter vacation policies means everyone can get away during the worst of it. That being said it is obvious that many building are being obnoxiously over-cooled in the US (and from recent experience in Mexico--and surely many other places). Clearly some consultants have determined that people buy more stuff when cold while offices are often set at the preferred temperature of the coldest person. Yet, ultimately I feel very uncomfortable with the idea of somehow mandating the temperatures that individuals have to live at. Incentivize more Sustainable behavior sure, but it is comments like this  that cause people hate liberals and environmentalists:
it makes me wish fervently that Hillary becomes president and forces everybody to put their thermostats at 76.
Globally, A/C is on track for a massive increaseIn case anyone doubted it, a recent study found that  as people in warm climates get wealthier they install A/C until there is virtually universal saturation (almost completed in the USA). There are literally billions of people who are getting wealthier living in the tropics or sub-tropics who can't wait to be a bit cooler. Stan Cox has warned us  that electricity consumed by A/C is set to multiply by 8-10 times!3)If I am really going to come back to this topic I'll need to check out his 2010 book, Losing Our Cool . A/C clearly re-made america  and no one actually wants  to undo that. Now it looks set to re-make the rest of the world.4)Another one for my reading list, Cool: How Air Conditioning Changed Everything .
As I said when talking about freezing dumplings , everything needs to be thought about in terms of how it scales to 7 billion. The other side of this coin is that every single one of those 7 billion should (in our Sustainable Future) have equal access to a great quality of life. I think it is fairly clear that, given the ability to do so (technologically and financially), most humans want to live, work and play in climates that don't get much hotter than 85 nor much cooler than 65. This is not something we are going to guilt away (nor should we), nor change with informational campaigns. Homo sapiens everywhere biologically prefer comfortable temperatures and we have the technology to deliver it and only delivering it to some (e.g. Americans) would be grossly unjust.
Photo by chooyutshing  
Photo by chooyutshing  
Applying TIP to our global A/C challengeSince I just published a framework  that I thought might help guide us to develop solutions to Sustainability problems, I had better apply it here.
- Continue to increase the efficiency of A/C units.
- Improve modeling of energy use to maximize efficiency.
- Thermostat and other personalized climate technologies .
- Individual Action
- Temperatures indoors should vary seasonally, cooler in the winter, warmer in the summer. (as should clothing etc)
- Set aside 5 minutes to set your programmable thermostat.
- Take advantage of utility subsidized energy audits and efficiency upgrades.
- Continue to improve efficiency standards. This year efficiency standards have been bumped up  and this needs to continue.
- Government buildings should be set at seasonally appropriate levels (also helps with norm setting).
- Subsidize energy efficiency improvements for cooling--in particular for low income residents.
- If LEED building standards  were applied we could see huge savings in energy for cooling.
- Companies could be pressured to change their thermostat settings in stores etc, in the way they have been pressured to buy sustainable wood etc. 
- Finance further research into cooling technology.
Footnotes [ +  ]
|1.||↑||See for example the weather in Guatemala City , 60-80F, and its like that all year long.|
|2.||↑||This is a point I hope to delve into more deeply in the future.|
|3.||↑||If I am really going to come back to this topic I'll need to check out his 2010 book, Losing Our Cool .|
|4.||↑||Another one for my reading list, Cool: How Air Conditioning Changed Everything .|
|5.||↑||I did a quick Google Scholar search and could not get past engineering and other technical type papers. Ideas to find papers on A/C in the real world?|
|6.||↑||I would guess it will continue to go up as people move to warmer climates but that will be more than offset by falling heating demand.|
|7.||↑||There are always unjust ways--e.g. no new A/C units can be installed.|