10 Best Smart Thermostats 2025 in the United States

The ecobee Smart Thermostat Premium is a versatile and user-friendly option for smart control of home heating and cooling. It supports Wi-Fi connectivity and integrates well with popular voice assistants like Siri and Alexa, enabling easy voice commands and remote control via your smartphone. A key feature is the included SmartSensor for doors and windows, which monitors entry and motion while adjusting the temperature in key rooms to reduce uncomfortable hot or cold spots. This can improve comfort and potentially save energy, with ecobee claiming up to 26% annual savings on heating and cooling costs.

Additional features include a built-in air quality monitor that alerts you to poor indoor air quality and reminds you when it’s time to change your furnace’s filter, helping maintain a healthy home environment. The thermostat is ENERGY STAR certified, ensuring it meets efficiency guidelines. Installation typically requires hardwiring, so basic electrical work or professional assistance might be necessary. The LCD display with backlight and built-in speaker enhance usability, and smart scheduling features allow customization of temperature settings to fit daily routines.

Some advanced features, such as customizable security alerts for motion or entry, require a subscription to ecobee Smart Security, which is an additional cost. Also, the hardwired power source requirement may limit installation options in some homes. This thermostat is well suited for homeowners seeking a smart, energy-saving device with advanced comfort controls, air quality monitoring, and compatibility with voice assistants or integrated home security.

The Amazon Smart Thermostat is a solid choice for anyone looking to upgrade from a traditional thermostat to a smart option that helps save money and energy. One of its key strengths is its compatibility with Alexa and Ring, which allows for easy voice control and integration into your smart home ecosystem. The thermostat’s learning capabilities are impressive; it can adapt to your schedule and preferences over time, optimizing temperature settings automatically based on your presence at home. The energy-saving features, including potential rebates from energy providers, make it appealing for those looking to lower utility bills.

Installation is designed to be user-friendly, with guidance available through the Alexa app, making it accessible even for those who might not be particularly handy. The ability to monitor energy usage and receive automatic reminders for air filter replacements adds another layer of convenience.

There are some limitations to consider. The requirement for a C-wire for installation might be a hurdle for some users, particularly in older homes where this wiring isn’t always standard. It's also worth noting that while it works with 2.4 GHz networks, it does not support 5GHz connections, which may limit compatibility with some modern routers. Additionally, while the thermostat can work with temperature sensors through compatible Echo devices, it does not include a built-in microphone, meaning you will need to rely on an Alexa-enabled device for voice commands. The reliance on the Alexa app for many features may also deter those who prefer a more standalone experience.

The Google Nest Thermostat is a smart thermostat designed to help you save energy while keeping your home comfortable. It works with most heating and cooling systems—about 85% compatibility—and supports Wi-Fi, so you can control it remotely via your phone, tablet, or laptop. It integrates smoothly with popular smart home assistants like Google Assistant and Alexa, allowing voice control if you have a compatible device. Installation is straightforward for most users, usually taking about 30 minutes with the included hardware and instructions.

One handy feature is that the thermostat automatically lowers the temperature when you leave, helping reduce wasted energy. You can create energy-efficient schedules through the Google Home app and receive suggestions for even more savings via the Savings Finder tool. The thermostat also monitors your HVAC system’s health and alerts you if maintenance is needed, which can prevent costly repairs. For some heating and cooling setups, especially simpler or specialized systems, you may need an additional power accessory called a C wire, which might complicate installation.

The Nest Thermostat offers basic scheduling but lacks advanced learning abilities found in higher-end models that adapt to your habits over time. It is a good choice for people who want an easy-to-use, energy-saving thermostat with solid smart home integration, though those looking for deep learning features or full compatibility with every system might find limitations.