Smart Thermostats
Best Smart Thermostat Under $100 (2026): 4 Models Side by Side
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For a smart thermostat on this list, the Honeywell Home leads: it pairs 7-day programming with a touchscreen display, Smart Response Learning and indoor humidity readouts. The Riseem, Cielo and Nest add Wi-Fi and app control, while the Cielo adds voice control and the Nest adds room sensor support.
Starting out? See the main guide: Best Smart Thermostat
Top picks at a glance
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9.2 View on Amazon
Compare the specs
Ranked on room sensor support, works with alexa / google, energy star, phone app control from each listing, plus how many buyers have rated it. A dash (—) means we could not confirm that figure from the listing.
| Pick | Room sensor support | Works with Alexa / Google | ENERGY STAR | Phone app control | Weight | Warranty |
|---|---|---|---|---|---|---|
| 1. Honeywell Home 7 Day Programmable Touchscreen Thermostat | — | — | — | — | 0.45 lb | 1-year |
| 2. Riseem WiFi Thermostats for Home Smart Thermostat Single-Stage | — | — | — | Yes | — | — |
| 3. Cielo Smart Thermostat Eco for Central HVAC | — | Yes | Yes | Yes | 0.4 lb | 3-year |
| 4. Google Nest Learning Thermostat E 3rd Generation | Yes | — | — | — | 0.79 lb | — |
Honeywell Home 7 Day Programmable Touchscreen Thermostat
Its 7-day programming, touchscreen display, Smart Response Learning and indoor humidity readouts cover daily scheduling in one unit.
- 1-year warranty stated
Good for
- Buyers who want 7-day programming on a touchscreen
- Buyers who want indoor humidity readouts
Skip it if
- You want a thermostat under 0.45 lb
- You want a warranty longer than 1 year
It programs day-to-day, over the weekend or for a full week, and the backlit touchscreen shows indoor temperature plus humidity readouts. Smart Response Learning senses whether the home needs heating or cooling and learns cycle times, and filter change reminders appear on screen. It runs on battery or hard-wire power, keeps settings through a power outage with permanent day and time backup, and covers single-stage and multistage systems, heat pumps, hot water, steam and gas fireplaces. It weighs 0.45 lb and carries a 1-year warranty.
Riseem WiFi Thermostats for Home Smart Thermostat Single-Stage
Its Wi-Fi app control and 7-day or 0-day programming cover remote control of a single-stage 1-heat and 1-cool system.
- Phone app control
Good for
- Buyers who want remote control through an app
- Buyers who want 7-day or 0-day programming
Skip it if
- You need multistage heating and cooling
- You need a free C-wire adapter included in the box
It controls a single-stage 1-heat and 1-cool system over Wi-Fi through an app, with 7-day or 0-day programming. A C-wire is required for installation. It comes in blue.
Cielo Smart Thermostat Eco for Central HVAC
Its Wi-Fi app control, voice control, ENERGY STAR certification and free C-wire adapter cover central HVAC control for most 24V systems.
- Works with Alexa / Google
- ENERGY STAR
- Phone app control
- 3-year warranty stated
Good for
- Buyers who want voice control with Alexa or Google
- Buyers who want a free C-wire adapter included
Skip it if
- You want a thermostat under 0.4 lb
- You want a warranty longer than 3 years
It works with Alexa, Google Assistant, Siri Shortcuts, SmartThings, IFTTT and Home Assistant, and the free iOS and Android app gives control from anywhere. Intelligent weekly scheduling covers Home, Away and Asleep presets, vacation mode guards against extreme temperatures, and energy consumption insights show heating and cooling patterns. It supports conventional systems up to 2-heat and 2-cool stages and heat pumps up to 4-heat and 2-cool stages, and the box includes a free C-wire adapter. It measures 1.02 by 3.94 by 3.94 inches, weighs 0.4 lb and carries a 3-year warranty.
Google Nest Learning Thermostat E 3rd Generation
Its learning schedule, Home/Away Assist, HVAC monitoring alerts and room sensor support cover a system that programs itself.
- Room sensor support
Good for
- Buyers who want a thermostat that learns their schedule
- Buyers who want room sensor support
Skip it if
- You want a thermostat under 0.79 lb
- You want a room sensor included in the box
It learns the schedule and the temperatures you like and programs itself, and Home/Away Assist shifts to an Eco Temperature after you leave. Remote control from a phone, laptop or tablet changes the temperature from anywhere, and HVAC monitoring sends an alert if something does not seem right. The Nest Leaf appears when you choose a temperature that saves energy, Energy History shows how much energy you used, and it works with the Nest Temperature Sensor, sold separately, for one room. It weighs 0.79 lb and works with 95% of heating and cooling systems.
How to choose
Wi-Fi and app control
Wi-Fi and app control separate this group: the Riseem, Cielo and Nest connect over Wi-Fi and work through an app, while the Honeywell Home uses its touchscreen and 7-day programming. If remote control from a phone matters, compare the app options on the Wi-Fi picks, and weigh voice control and room sensor support too, since only the Cielo covers voice control and only the Nest covers room sensor support. Match the control method to how you adjust temperature each day.
Compatibility and C-wire needs
Compatibility decides whether a pick fits your system, so compare the stated system types before ordering. The Honeywell Home covers single-stage and multistage heating and cooling, heat pumps, hot water, steam and gas fireplaces. The Cielo covers most 24V systems, with conventional systems up to 2-heat and 2-cool stages and heat pumps up to 4-heat and 2-cool stages. The Riseem covers a single-stage 1-heat and 1-cool system and requires a C-wire, while the Cielo includes a free C-wire adapter in the box. Check your system type and wiring first.
Scheduling, learning and upkeep
Scheduling is the core job here: the Honeywell Home programs day-to-day, over the weekend or for a full week, the Riseem offers 7-day or 0-day programming, and the Cielo adds Home, Away and Asleep presets. Learning goes a step further, since the Honeywell Home learns heating and cooling cycle times and the Nest learns the schedule and temperatures you like. For upkeep, the Honeywell Home shows filter change reminders on screen, and the Nest sends HVAC monitoring alerts when something does not seem right. Pick the scheduling style that fits your week.
FAQ
Which thermostat works with voice assistants?
The Cielo is the only pick with voice control. It works with Alexa and other voice assistants.
Which picks need a C-wire?
The Riseem requires a C-wire, and the Cielo includes a free C-wire adapter for homes without an existing C-wire.
Which thermostat learns your schedule?
The Nest learns the schedule and the temperatures you like and programs itself. The Honeywell Home learns heating and cooling cycle times through Smart Response Learning.
Which pick shows indoor humidity?
The Honeywell Home shows indoor temperature plus humidity readouts on its backlit touchscreen display.
