GreenChoice
Energy-Efficient Home

Smart Thermostats for Energy Savings: Features and Setup

Compare smart thermostat schedules, occupancy controls and room sensors, with equipment-specific setup advice and practical ways to assess savings claims.

By GreenChoice Updated September 4, 2026
Affiliate disclosure: We may earn a commission if you buy through links on this page. This guide is based on published research and product information. Confirm current product details and terms with the retailer.

Research-based guidance · Sources and editorial standards

Start with a buying question: what should a new thermostat do that your current control does not? You might want to change settings remotely, automate away temperatures or include a room sensor. Use those needs to choose features—not to predict a particular reduction in your bills.

ENERGY STAR-certified smart thermostats have demonstrated energy savings through independently assessed field data. That is a useful purchasing criterion, but it is not a household-specific savings forecast. ENERGY STAR thermostat guidance

Compare how each thermostat manages your schedule

ecobee Smart Thermostat Premium combines editable Home, Away and Sleep settings with occupancy-based adjustments. Its Schedule Assistant learns your routine and recommends schedule changes. A SmartSensor is included; ecobee describes it as sensing room temperature and occupancy for comfort adjustments. This is an option to compare when you want both a visible schedule and room-sensor input in the initial package. ecobee Premium features

Google Nest Thermostat and Nest Learning Thermostat are not interchangeable scheduling choices. The model named Nest Thermostat lets you create and edit a temperature schedule but does not use Auto-Schedule. Nest Learning Thermostat, 4th generation, uses Smart Schedule, a different learning system from earlier models. Google’s Auto-Schedule instructions apply to Nest Thermostat E and the 3rd-generation-or-earlier Learning models. If you want to set the schedule yourself, compare the basic Nest Thermostat; if learning is the attraction, match the feature and instructions to the exact generation. Google’s explanation of Nest learning

Sensi Touch 2 offers a schedule for each day of the week, remote adjustments and geofencing based on smartphone location. Its app reports heating, cooling and fan runtime. Compatible room and outdoor sensors are sold separately. It is worth comparing when your priorities are setting your own weekly routine and reviewing when equipment runs. For a room-sensor setup, compare the thermostat-plus-sensor purchase with ecobee’s included-sensor package, rather than comparing thermostats alone. Sensi Touch 2 features

Keep sensor types straight when comparing extras. ecobee’s included room SmartSensor is not the accessory required for its open-door/window heating-and-cooling pause feature. That feature requires door/window SmartSensors and an ecobee Smart Security subscription. Do not count it as part of the included room-sensor functionality. ecobee feature requirements

For power, network and smart-home compatibility considerations, see the Wi-Fi thermostat buying guide.

Match the setup to your equipment and household

Resolve equipment compatibility before choosing automation. ENERGY STAR recommends checking the heating and cooling system and suggests considering a controller from the equipment manufacturer for the very highest-efficiency equipment. Ask the installer whether that advice applies to your system before choosing a replacement. ENERGY STAR buying guidance

Then work through the decisions that determine your daily settings:

  • Write down the routine you actually want. Include work-from-home days, weekends and regular absences. Decide whether you want to edit that routine yourself, receive suggested changes or use a learning schedule.
  • Plan away settings for the household, not just one phone. Before enabling location-based automation, decide what should happen when one person leaves but another remains home. Sensi explicitly describes its geofencing as using smartphone location. Sensi scheduling and geofencing
  • Agree on how to handle exceptions. Decide who will edit the schedule and how to restore the normal routine after guests or travel. For ecobee users, Vacation Mode lets you enter trip dates and temperatures without replacing the regular schedule. ecobee scheduling and vacation controls

Ductless mini-splits need a different starting point from an away-setback plan. ENERGY STAR’s ductless guidance recommends maintaining a steady comfortable temperature. It also recommends selecting heating or cooling rather than automatic mode switching; that is separate from the fan setting, for which it allows automatic operation or a suitably low speed. Keep this advice specific to the mini-split use case and follow your equipment’s operating instructions. ENERGY STAR ductless operating advice

Read savings claims against their baseline

The comparison behind a savings claim matters. ecobee’s advertised savings comparison uses a constant temperature hold. Copeland’s Sensi calculation compares runtime among users making temperature adjustments with users making none; it also says results vary with equipment, insulation, climate and the size and frequency of adjustments. Neither comparison establishes what your household would save over its existing schedule. ecobee savings notes · Copeland savings methodology

Use runtime reports to investigate when equipment operates, not as a substitute for an energy-meter reading. Sensi separates heating, cooling and fan runtime. ecobee reports system activity and also documents preheating and precooling to reach a temperature at the scheduled time. An early start can therefore be intentional rather than evidence that the schedule was ignored. Sensi usage reports · ecobee reports and preconditioning

For a household before-and-after check, record utility energy units and billing-period lengths alongside settings, occupancy, weather, equipment changes and rates. Treat the comparison as an observation, not proof that the thermostat alone caused a difference.

Also separate reduced consumption from cheaper timing and utility incentives. ecobee describes preheating or precooling under eligible time-of-use rates, while ENERGY STAR notes that utility programs may offer incentives. Track those financial benefits separately from changes in energy use. ecobee time-of-use features · ENERGY STAR utility-program guidance

The practical buying rule is simple: choose a compatible control whose features you intend to use. If the main attraction is remote convenience, evaluate it on that basis rather than making advertised savings the purchase justification.

Sources