Most people can quote the price of gas and their car's mileage, and far fewer know what it costs to run their house each month, even though the house is the bigger bill. Roughly half of a typical home's energy goes to heating and cooling; the rest is lighting, water heating, appliances, and electronics. A smart home cannot change the weather, but it can make sure the house is only working hard when someone is there to benefit, and that is where the savings come from.
Heating and cooling
A smart thermostat learns or follows a schedule, senses whether anyone is home, and lets you adjust the house from wherever you are. ENERGY STAR reports that certified smart thermostats save about 8 percent on heating and cooling bills on average, and more in homes that were previously left at one temperature all day. In an integrated system the thermostat is also connected to everything else: an "away" scene can set the temperature back, close the shades, and turn off the lights in one command, and a "home" scene can bring it all back before you arrive.
Lighting
LED fixtures already use a fraction of the power of the bulbs they replaced, and lighting control adds the discipline. Occupancy and vacancy sensors turn lights off in rooms nobody is using; schedules and astronomical timers handle exterior lighting; dimming, which most rooms benefit from anyway, reduces consumption further. Centralized lighting control, which we design and install as a Control4 Centralized Lighting Certified dealer, puts the whole house behind a single "all off" at bedtime, so nothing is left burning in the basement.
Shades
Windows are where heat gets in during summer and out during winter. Motorized shades on a schedule, or tied to the sun's position, block afternoon solar gain in July and let it in during January, which takes real load off the HVAC. They also protect furniture and floors from fading. Lutron's shading systems integrate directly with the lighting and climate controls, so the house manages its own windows.
Standby loads and the equipment rack
Televisions, receivers, streaming devices, and amplifiers draw power even when they appear to be off. A control system powers equipment down properly when a room is finished with it, and a managed power sequencer in the rack cuts standby draw from gear that does not need to be on around the clock. It is a modest saving on its own and a meaningful one across a whole house of electronics.
Knowing where the energy goes
Many systems can show how much the house is using and when. That feedback changes behavior more reliably than any single device: a homeowner who can see that the pool pump and the bonus room are the two biggest loads usually does something about both.
A realistic expectation
Automation does not save energy by itself; it saves energy by doing consistently what people forget to do. The households that see the largest reductions are the ones that let the system run its schedules and scenes rather than overriding them, and that plan the controls into the house from the start. A recent kitchen remodel we completed is a good example of lighting, shading, and climate designed together.
If lower bills are one of your goals for a smart home, tell us so; it changes some of the design choices. Our smart home page covers the systems involved, and a consultation is free.