10 Best Thermostat Controlled By Phone 2026 in the United States

The Honeywell Home RTH9585WF1004 Wi-Fi Smart Color Thermostat offers a user-friendly experience with its bright, customizable color touchscreen that makes manual control straightforward and visually appealing. It supports a wide range of heating and cooling systems including gas, oil, electric forced air, hot water, steam, and heat pumps, but it does require a C-wire for power and isn’t compatible with electric baseboard heating. This means you should check your home’s wiring before buying.

The thermostat connects via Wi-Fi and works well with popular smart home systems like Amazon Alexa, Google Home, and others, allowing you to control your home temperature from your phone or via voice commands. It features flexible 7-day programming to match your schedule, along with Smart Response Technology to adjust temperature smoothly. Energy Star certification and monthly energy reports help you track and reduce energy use, and the option to join local utility demand response programs can save you money if available.

Installation may be somewhat technical if you require a C-wire adapter or have an uncommon heating system, so some users might want professional assistance. This thermostat is ideal for homeowners seeking strong compatibility, easy app and voice control, and energy-saving tools, while those looking for more advanced learning or geofencing features may want to consider other products.

The Google Nest Learning Thermostat (4th gen) is a smart thermostat designed to make managing your home's heating and cooling easy and energy-efficient through your phone or voice commands. It works with most common heating systems without needing extra wiring, which simplifies installation for many homes. You can control it from the Google Home app or with Alexa, Siri, or Google Assistant, giving flexible options to fit your smart home setup.

Its user interface is very user-friendly, featuring a large, bright, and clear round display that you can customize with different designs and which automatically adjusts brightness based on your room lighting. The thermostat learns your schedule over time and suggests energy-saving changes, but it always asks for your approval before making adjustments, helping you stay in control. It also uses outside weather information to optimize heating and cooling, which can help save on energy bills by about 12% for heating and 15% for cooling. The included Nest Temperature Sensor lets you monitor and control temperatures in different rooms, tackling hot or cold spots effectively. Geofencing features automatically switch the system to energy-saving modes when you leave and return, making it convenient without needing manual changes.

Installation is relatively straightforward, especially since it usually doesn’t require a common wire (C wire), though checking compatibility with your system beforehand is recommended using Google's Compatibility Checker. The thermostat requires battery replacement (one CR2 battery included), which adds minor maintenance. While it supports many smart home platforms, some users might find the Google Home app less intuitive initially if new to smart home tech. Additionally, very complex or unusual HVAC systems may not be fully compatible. This thermostat is a strong choice for homeowners wanting an easy-to-use, smart, and energy-saving system controllable from their phone, with added comfort through learning capabilities and multi-room sensing.

The Google Nest Thermostat is a user-friendly smart thermostat ideal for homeowners who want to control their heating and cooling remotely through their phone. It connects via Wi-Fi and works with both iOS and Android devices through the Google Home app, making it accessible for most users. The thermostat is ENERGY STAR certified, helping reduce energy use by adjusting settings when you leave home, and includes a feature called Savings Finder to suggest ways to save more. It supports voice control with Google Assistant and other smart home platforms, adding convenience for hands-free operation.

The interface is simple with a touchscreen and a clear LCD display, which is easy to read and operate. Installation is mostly straightforward and doesn’t usually require a common wire (C wire), though some heating or cooling systems will need additional wiring or accessories. The Nest Thermostat also monitors your HVAC system and can alert you to potential issues, providing a helpful layer of maintenance support. However, it may not be compatible with all HVAC systems, so checking compatibility before buying is important.

With programmable schedules and geofencing for automatic adjustments based on your location, the device lacks the advanced learning features found in higher-end Nest models. Its sleek, compact design with a glossy finish fits nicely on most walls. This thermostat is a solid choice for those seeking easy phone control, energy savings, and basic smart features without complex setup or high cost, but ensuring your system’s compatibility and wiring needs beforehand is recommended.