Heating and cooling buildings uses a heck of a lot of energy: So what can we be doing better? Keeping It Cool interviews Deborah Vasquez, an apartment complex manager who created big energy savings for residents through building renovations and upgrades. Yifei and Vivian uncover more ways that homeowners can cut greenhouse emissions (and lower energy bills) by chatting with Jeffrey Liang, who works for an energy efficiency agency called BayREN. His mission: to help us think about our homes with the same excitement that we have for our iPhones or Teslas.