This is about as comprehensive a synthesis of what is known about these problems as has been put out by the federal research program. (climatesciencewatch.org)
If you're away from home for any extended amount of time, you probably won't know about any problems with your HVAC system that happen to arise. (howtogeek.com)
When I give talks about energy, the audience already knows about the problems. (discovermagazine.com)