Many of us are worried about climate change. Nevertheless, Houstonians trying to figure out out what they personally can do about it might feel overwhelmed—and intimidated. Making our homes more energy-efficient is a way to make a difference, but big-ticket items like new air-conditioner units can be a tough sell. The thing to remember, explains Steven Stelzer, program director for the city's Green Building Resource Center, is that initial costs will be offset by savings down the road. “Investments in energy efficiency at your house can return 20 percent on your investment,” he says. “It’s huge.” But families that aren’t ready for something as large as a new A/C have other options. Re-insulating your attic is relatively simple and inexpensive; even better, it can dramatically reduce your home heating and cooling bills.