Best Smart thermostats 2026: 12 Compared (21 Sources)

What are the best smart thermostats in 2026?

Summary

Answer one question before any spec: does your current thermostat have a C-wire? With one, every low-voltage pick here is open to you. Without one, the Google Nest Learning Thermostat (4th Gen) needs none [src1, src2]; the Ecobee Smart Thermostat Premium and Enhanced come with a wiring adapter in the box [src4]; the Honeywell Home X8S comes with a promo code for a free C-wire adapter [src6]; and the Ecobee Smart Thermostat Essential needs ecobee's Power Extender Kit, sold separately for $24.99 [src13]. The Honeywell Home X2S, Sensi Touch 2 and Amazon Smart Thermostat need a C-wire [src15, src3, src7]. And if your heat is 120V or 240V electric baseboard, none of these work at all; that is what the Mysa is for [src18, src9].

Our sources split on the top spot. CNET and Popular Mechanics name the Ecobee Smart Thermostat Premium their best smart thermostat overall [src7, src9]; Bob Vila and TechRadar pick the Google Nest Learning Thermostat (4th Gen) [src1, src8]; Tom's Guide picks the Honeywell Home X8S [src2]; and Reviewed's best overall is still the older third-generation Nest Learning Thermostat [src3]. Consumer Reports scores the Premium strongly across the board and puts the Nest in one of its top spots [src4]. With the two this close, the Premium stays on top for reasons the sources give: it works natively with Apple Home, Alexa, Google Home and SmartThings [src4], it is the top-scoring thermostat in RedRecs' analysis of Reddit threads, which calls the Nest polarizing [src5], and Tom's Guide's stated reservation about the Nest is Google's record of discontinuing products [src2]. If you have no C-wire or live in Google's ecosystem, the Nest is the better buy, and the head-to-head below sets out the trade.

Below the flagships, Tom's Guide and CNET both make the Ecobee Smart Thermostat Essential their budget pick, and Bob Vila scores its value 4.8 out of 5 [src2, src7, src1]; we call it the value pick because two credible thermostats cost less. The Honeywell Home X2S is Reviewed's best value smart thermostat and Bob Vila's best basic model, with a 5 out of 5 for value [src3, src1], and the Amazon Smart Thermostat is the Alexa pick of Reviewed and CNET [src3, src7]. Expect modest savings from any of them: the Department of Energy's estimate, as Tom's Guide reports it, is about 8%, or around $50 a year [src2], well below the up-to-26% ecobee advertises for the Premium [src11].

Top 12 Models Compared

Best for Each Use Case

Best Overall: Ecobee Smart Thermostat Premium ($209.99) — Check price

CNET calls the Premium the top Wi-Fi thermostat that can do everything and says that, if money is no object, it eclipses the competition; Popular Mechanics also makes it its best overall [src7, src9]. Consumer Reports' lab gives it strong scores across the board for manual controls, automated heating and cooling and smart features [src4], and it has the highest signal score (94 out of 100) in RedRecs' analysis of about 5,500 Reddit comments [src5]. It comes with a SmartSensor for a second room, radar occupancy sensing, an indoor air-quality monitor and Siri or Alexa built into its speaker; Consumer Reports notes that Siri needs an Apple HomePod to work [src4, src11]. It works with Apple Home, Alexa, Google Home and SmartThings, and the wiring adapter in the box covers homes without a C-wire [src4, src11]. Tom's Guide adds smoke-alarm detection and a live feed from an ecobee video doorbell on its screen [src2]. ecobee claims savings of up to 26% on heating and cooling; treat that as a ceiling, not a forecast [src11]. ecobee's own store lists it at $209.99, down from a regular $259.99 [src11]. The trade-off is cost: CNET's main complaint is that it is very expensive [src7].

Best Value: Ecobee Smart Thermostat Essential ($109.99) — Check price

Tom's Guide and CNET both make the Essential their budget pick [src2, src7], and Bob Vila names it best for smart features, with 4.8 out of 5 for value [src1]. It keeps the core: a full-color touchscreen, Apple HomeKit, Alexa and Google control, scheduling, and support for ecobee's remote room sensors [src2, src13]. What it drops is the Premium's included sensor; Tom's Guide points out that adding even one sensor brings the cost close to the Premium's, and finds the design a bit cheap [src2]. Two more costs to plan for: the Power Extender Kit is sold separately for $24.99 if you have no C-wire [src13], and Bob Vila found it supports only 2.4GHz Wi-Fi [src1]. Bob Vila's tester installed it in about 15 minutes [src1]. ecobee's store lists it at $109.99, down from a regular $139.99, with a 3-year warranty and claimed savings of up to 23% [src13].

Best Budget: Honeywell Home X2S ($79.99 at Honeywell Home on 2026-10-06) — Check price

Reviewed calls the X2S a stellar pick for a tight budget and its best value smart thermostat [src3]; Bob Vila names it best basic, with 5 out of 5 for value [src1]; TechRadar picks it as its Matter-certified thermostat [src8]. It looks like a classic Honeywell thermostat, with buttons instead of a touchscreen, and runs through Resideo's First Alert app [src1, src3]. Being Matter certified, it works with Apple Home, Google Home and Alexa [src1, src15]. The limits: no room-sensor support at all, a C-wire required, and an app that is basic next to premium rivals [src3, src15, src1]. TechRadar's tester needed a C-wire adapter and a professional installer, and could not get Siri voice control to work [src8]. Honeywell rates it for up to 2 heat/2 cool conventional systems and 2 heat/1 cool heat pumps, and says it does not work with electric baseboard heat [src15]. Reviewed quotes it at just over $50; Honeywell's own price is $79.99 [src3, src15].

Availability, honestly stated: Amazon showed no purchasable offer for the X2S in our three most recent daily checks, the last on 2026-10-05. Honeywell Home's own store listed it at $79.99 and orderable when we checked on 2026-10-06 [src15]. If you run an Alexa home and need a thermostat this week, see the Amazon Smart Thermostat below.

Best Learning Thermostat: Google Nest Learning Thermostat (4th Gen) ($239.99) — Check price

Bob Vila and TechRadar both make it their best smart thermostat overall, Tom's Guide its best Nest, CNET its best design, and Popular Mechanics its best for Google homes [src1, src8, src2, src7, src9]. Consumer Reports places it in one of the top spots of its ratings and says it aces the lab's tests for automated heating and cooling [src4]. It learns your routine, suggests schedule changes for you to accept or reject, and takes the outdoor weather into account [src2, src8]. It needs no C-wire, comes with a Nest Temperature Sensor (extras are $39), and supports Matter, so it works with Apple Home, Alexa and SmartThings as well as Google Home [src2, src4]. Its Dynamic Farsight screen shows temperature, time and weather as you walk past [src2], and Bob Vila's tester, who used it for six months in a Florida home, gave it 5 out of 5 in all four scoring categories [src1]. Two reservations: Tom's Guide worries about Google's record of ending products, including the shutdown of the first- and second-generation Nest Learning Thermostats [src2, src10], and TechRadar notes that upgrading from the third generation is not as simple as you might expect [src8].

Best for Whole-Home Comfort: Honeywell Home X8S ($259.99) — Check price

Tom's Guide makes the X8S its best smart thermostat overall [src2], Reviewed its best for whole-home comfort control [src3] and CNET its best for whole-house control [src7]. Its 5-inch, 480 x 800 touchscreen doubles as a smart display, and it can show and talk through First Alert VX1 and Ring video doorbells; Tom's Guide found the video worked well but the incoming audio was patchy [src6, src2, src17]. With room sensors you can tell it which room to prioritise at which time of day, and Reviewed says it supports up to 20 of them [src2, src3]. It adds indoor air-quality monitoring with a "feels like" temperature, onboard radar presence detection, and Matter certification for Apple Home, Google Home and Alexa [src3, src17]. It needs a C-wire, but a promo code in the box gets you Honeywell's adapter free [src6]. Installation is the catch: Tom's Guide's tester spent close to two hours on it, and Reviewed found the app setup frustrating [src6, src3]. Honeywell rates it for up to 4 heat/2 cool heat pumps and 3 heat/4 cool conventional systems, with a 2-year warranty [src17]. The listing we link is the black model with one room sensor in the box; when we checked on 2026-10-06, Honeywell's store sold that version at $249.99 and the model without a sensor at $219.99 [src17].

Best for Alexa: Amazon Smart Thermostat ($56.99) — Check price

Reviewed and CNET both make it their best smart thermostat for Alexa [src3, src7], Bob Vila calls it the best bang for the buck [src1] and Popular Mechanics makes it its best budget pick [src9]. Alexa Hunches adjust the temperature for whether you are home, away or asleep, and CNET notes an Echo Dot (5th gen) can act as a separate room sensor [src1, src7]. It works only with Alexa — not Google Home or Apple HomeKit — has no remote sensors of its own, and needs a C-wire, though Amazon sells a version bundled with an adapter [src3]. Bob Vila found its energy tracking more directional than precise, and CNET flags Amazon's handling of household data as a privacy question some buyers will care about [src1, src7]. Tom's Guide sums it up: not the best smart thermostat, but it does a lot for its budget price [src2].

Best Traditional-Style: Sensi Touch 2 ($159.99) — Check price

Reviewed names the Sensi Touch 2 its best traditional-style smart thermostat [src3], Bob Vila its best touchscreen [src1] and CNET its most user-friendly pick [src7]. It looks and works much like a classic programmable thermostat, with a large, clear touchscreen; Bob Vila praises its app-guided installation and Sensi's stated commitment not to sell personal data [src3, src1]. Bob Vila and CNET list Alexa, Google Assistant and SmartThings support [src1, src7]. It takes up to 15 optional room sensors, and with them Reviewed measured accuracy within 1 degree [src3]. What it lacks, CNET says, is learning and built-in presence sensing [src7]. Reviewed and CNET list a C-wire as required [src3, src7].

Best with Motion Sensor: Ecobee Smart Thermostat Enhanced ($164.99) — Check price

Reviewed names the Enhanced its best with a motion sensor [src3], and Consumer Reports includes it among its top thermostats for furnaces and central AC [src4]. It has most of the Premium's features without the air-quality sensing, the built-in Alexa and Siri, and the included room sensor [src3]; its radar occupancy sensor is built in [src4]. It works with Alexa, Apple Home, Google Home and SmartThings, and ships with a wiring adapter [src4]. Consumer Reports found it performs well for manual operation but is less proficient at learning your routine; it suggests schedule changes instead of making them [src4].

Budget Google Option: Google Nest Thermostat ($99.99) — Check price

Buy with caution. The Nest Thermostat keeps Google's Eco Mode, Home/Away Assist and scheduling at a lower price, but it cannot learn your preferences and does not work with Nest Temperature Sensors [src3]. Tom's Guide finds it about the same price as the Ecobee Smart Thermostat Essential and says you get more for your money with the Ecobee [src2], and CNET says a few things held it back [src7]. Reviewed lists a C-wire as not required for most users, but could not get it to work properly without one, and its first unit had to be replaced [src3]. Reddit threads collected by RedRecs report frequent hardware failures [src5].

Best for Home Assistant: Honeywell Home T6 Pro Z-Wave — Check price

It is the second-highest-scoring thermostat in RedRecs' Reddit analysis, summed up as local control, no cloud dependency, Home Assistant compatible and extremely reliable [src5]. A Home Assistant user who installed one and ran it for months (jpk.io) found it pairs locally in under a minute with no cloud account, keeps running its last schedule if Home Assistant goes down, and covers up to 3 heat/2 cool stages, including heat pumps with auxiliary heat [src19]. It runs on three AA batteries or on 24V power, so a C-wire is optional, though on batteries the screen dims aggressively [src19, src20]. You need your own Z-Wave controller, and it has no humidity setpoint control [src19]. The TH6320ZW2007 version we link is the one with Z-Wave SmartStart pairing [src20]. On 2026-10-05 our Amazon check found it out of stock, offered only by a marketplace seller.

Best for Electric Baseboard Heat: Mysa Smart Thermostat for Baseboards (V2) ($159.00) — Check price

If your heat is 120V or 240V electric baseboard, fan-forced in-wall or in-ceiling radiant, none of the 24V thermostats above can control it. Popular Mechanics names the Mysa its best for baseboard heat, noting that most smart thermostats are not compatible with baseboard systems [src9], and it is the baseboard pick in RedRecs' Reddit analysis [src5]. Mysa rates it for up to 3,800W at 240V or 1,900W at 120V; it needs a neutral or second live (L2) wire and cannot run on a two-wire setup [src18]. The V2 adds energy monitoring and a humidity sensor; the cheaper Mysa LITE drops both [src18]. It works with Google Home, Alexa and Apple HomeKit, with no subscription [src18]. One Mysa replaces one line-voltage thermostat; heaters wired in parallel can share one within its power limit, but a whole-home retrofit usually means several units [src18].

Room-Sensor Pick, Discontinued by Honeywell (checked 2026-10-06): Honeywell Home T9 — Check price

Bob Vila calls the T9 the best sensor-based thermostat it tested [src1], Consumer Reports says it scores near the top for automating heating and cooling [src4], and Popular Mechanics names it best for saving energy [src9]. It comes with a room sensor and lets you choose which room to prioritise; extra sensors cost around $40 each or $75 for two [src1, src4]. It needs a C-wire and has a 3.5-inch color touchscreen [src1]. But Honeywell Home lists the T9 as discontinued and no longer available for sale (checked 2026-10-06) [src16], and Amazon had no in-stock offer when our check last looked, on 2026-10-05. Buy one only from remaining stock; the Honeywell Home X8S above is Honeywell's current thermostat with room-sensor support [src17].

Key Market Trends (2026)

• Honeywell's lineup has turned over: Honeywell Home now lists the T9 as discontinued (checked 2026-10-06); its current smart thermostats are the X8S and the X2S, which Honeywell says replaces its RTH6580 Wi-Fi thermostat. [src16, src17, src15]
• Matter is common but not universal: the Honeywell X8S and X2S and the Google Nest Learning Thermostat (4th Gen) are Matter certified [src6, src15, src2], while ecobee's own product pages list Alexa, Google Assistant and Apple Home (plus SmartThings on the Premium) but not Matter [src11, src13].
• Thermostats are becoming small smart displays: the Honeywell X8S shows and talks through Ring and First Alert doorbells, and the Ecobee Premium shows an ecobee doorbell feed and listens for smoke alarms. [src6, src2]
• ENERGY STAR moved and federal rebates thinned: Tom's Guide reports the program moved from the EPA to the Department of Energy in early 2026 and that federal rebates for smart thermostats are largely gone; some utilities still offer them. [src2]
• The subscription layer moved around the thermostat, not onto it: Google replaced Nest Aware with Google Home Premium in October 2025 ($10 or $20 a month), and ecobee's Smart Security plans run $5 or $10 a month; neither is needed for heating and cooling control. [src12, src14, src2]
• Vendor longevity is a purchase criterion: Google ended support for the first- and second-generation Nest Learning Thermostats on 25 October 2025, and said in April 2025 that it would stop selling Nest thermostats in Europe; Tom's Guide advises not to expect more than ten years from any smart thermostat. [src10, src8, src2]

Important Caveats

• Prices in this text are the Amazon prices our daily check recorded, except where another store is named; the table at the top of this page shows each pick's current price and stock. Thermostat prices change often, so re-check before you buy. Each price is for the exact configuration named in the comparison table (finish, and whether a sensor is in the box).
• The C-wire, not the brand, decides most of this purchase. The Honeywell X2S, Honeywell T9, Sensi Touch 2 and Amazon Smart Thermostat need one; the Ecobee Premium and Enhanced ship an adapter, the Honeywell X8S a promo code for one, and the Ecobee Essential's adapter is sold separately; the Nest Learning Thermostat (4th Gen) needs none. If you are unsure, photograph your existing wiring and ask an HVAC technician before buying. [src15, src1, src3, src4, src6, src13, src2]
• HVAC compatibility varies by model; see the matrix above. Of the picks here, only the Mysa handles 120V/240V line-voltage heat; never wire a 24V thermostat to a line-voltage circuit. [src18, src15]
• Energy savings vary widely. Vendors advertise up to 23-26%; the Department of Energy's estimate, as Tom's Guide reports it, is about 8%, or around $50 a year, and depends on how you used your old thermostat. Treat any single-number payback claim sceptically. [src11, src13, src2]
• Google ended support for the first- and second-generation Nest Learning Thermostats on 25 October 2025; they no longer work in the Google Nest or Google Home apps. [src10]
• Two products on this card are hard to buy new right now: Honeywell Home lists the T9 as discontinued (checked 2026-10-06) [src16], and Amazon showed no purchasable offer for the Honeywell X2S in our three most recent daily checks, the last on 2026-10-05, while Honeywell Home's own store listed it at $79.99 on 2026-10-06 [src15].
• Sensors, adapters and multi-unit line-voltage retrofits are real costs the sticker price hides: $39-$50 per room sensor, $24.99 for ecobee's Power Extender Kit, and one Mysa per line-voltage thermostat. Budget the installed system, not the box. [src4, src13, src18]