Best Nest Alternatives 2026: 7 Smart Thermostats

The ecobee Smart Thermostat Premium earns a normalized 8.6 composite on the SHE Thermostat ROI Score, the top tier of this roundup. The weighted formula rewards feature depth, not raw dollars: it supports up to 32 sensors, ships one SmartSensor that heats occupied rooms, and adds an air-quality monitor reading VOCs, CO2 and humidity. The Power Extender Kit produces a clean install on systems missing a C-wire. Ecobee's published 23% savings, projected across a 3-year window, anchors the savings factor.

TechGearLab calls it "a feature-packed smart thermostat that lives up to its premium in its name but has the premium price tag to match," and Tom's Guide names it "the most feature-packed smart thermostat money can buy." PCMag notes the built-in Alexa speaker "is good enough to stand in for an Echo Dot in the hallway."

Compared to the field, the ecobee Smart Thermostat Enhanced delivers the same ecosystem breadth for less, and the Honeywell Home T9 outperforms it on sensor range — but loses HomeKit. Versus a household leaving Google that still wants Apple, the Premium yields the cleanest answer.

The ecobee Smart Thermostat Enhanced earns a normalized 8.5 composite on the SHE Thermostat ROI Score — effectively tied with the Premium because the weighted formula values what it keeps: HomeKit, Alexa, Google and SmartThings all working with no Google account. The Power Extender Kit produces the same C-wire-free install the Premium delivers.

Where it lands depends on one decision: do you want occupancy-aware comfort on day one? If yes, the Premium's included SmartSensor is worth the step up, or a separate SmartSensor reaches near-parity. If you only cared about phone and voice control — which describes many Gen 1 and Gen 2 Nest owners — the Enhanced is the value tier. ENERGY STAR certification also enables utility rebates of $50-$100 in many US markets, projected against the DOE 3-year savings baseline.

Compared to the Amazon Smart Thermostat it costs more but adds three ecosystems; versus the ecobee Smart Thermostat Premium it drops the sensor and air-quality monitor. The Enhanced is the middle that most multi-ecosystem migrators should start at.

The Honeywell Home T9 earns a normalized 8.5 composite on the SHE Thermostat ROI Score, and the weighted factor that carries it is sensor support: it's the multi-room comfort specialist. Nest's single-point reading heated to whatever the hallway felt like; the T9 reads occupancy across rooms and biases the HVAC target toward where people actually are, which yields real savings in homes that never heat evenly.

TechHive's verdict is blunt: "Honeywell's sensors, however, are the best we've tested." Tom's Guide adds that "the T9's sensors, price, and ease of use make it one of the best smart thermostats around." The advantage shows on the spec sheet: the 900 MHz radios reach up to 200 ft, where Ecobee's sensors top out near 60 ft, so the T9 covers a basement or detached bedroom Ecobee can't. Dual-band Wi-Fi also produces a clean join to a modern mesh network.

The hard limit is ecosystem: no HomeKit. Compared to an Apple Home setup, the ecobee Smart Thermostat Premium is the multi-room pick instead despite shorter range. For Alexa or Google households, the T9 is the focused tool.

The Honeywell Home T6 Pro Z-Wave earns a normalized 8.0 composite on the SHE Thermostat ROI Score, the only pick aimed at the local-control crowd Nest never courted. It speaks Z-Wave Plus with S2 Security and nothing else — no built-in Wi-Fi, no app account, no cloud. Every schedule runs through your hub on your own network, which is the point for buyers who left Nest over Google's data pipeline. Against the DOE baseline it still delivers smart-setback savings across a 3-year window.

SmartStart QR pairing enables adding it to Home Assistant, Hubitat or SmartThings before it's mounted, and the UWP snap-on system produces a quick install. The touchscreen differentiates it versus button-array Z-Wave rivals. The honest trade-offs are structural: it requires a Z-Wave hub, voice control only happens if the hub bridges it, and there's no room-sensor support.

No tier-1 outlet in our registry reviewed this exact Z-Wave SKU, so this section leans on verified Honeywell specs and the SHE score rather than outlet quotes. Compared to the cloud-connected picks above, this is the thermostat that fits a local-first house.

The Mysa Smart Thermostat for Electric Baseboard Heaters 240V earns a normalized 8.0 composite on the SHE Thermostat ROI Score, and it solves a problem none of the 24V picks can touch. Nest, Ecobee and Honeywell are low-voltage thermostats — they cannot wire into the line-voltage circuits that electric baseboard, fan-forced and in-floor heaters run on. Mysa handles loads up to 3.8 kW and delivers geofencing, 7-day scheduling and per-zone kWh tracking. Mysa's published 26% savings, projected across a 3-year window, drives the savings factor on an expensive baseboard bill.

It's unusually well-connected for line voltage: HomeKit, Google Home and Alexa all work, where most baseboard thermostats are dumb dials. The honest part is the math. Each Mysa is its own zone, so a baseboard house often needs three to six units, and line-voltage wiring deserves more respect than 24V control wiring — if it makes you hesitate, hire an electrician.

No second tier-1 outlet in our registry covered this SKU, so the section leans on verified Mysa specs and the SHE score rather than stacked quotes. Compared to a standard forced-air system, where the ecobee Smart Thermostat Premium wins, baseboard heat makes Mysa effectively the category.

The Amazon Smart Thermostat earns a normalized 7.6 composite on the SHE Thermostat ROI Score, and its rank is honest: the lowest-cost factor on this list, the narrowest feature envelope. The value goes deeper than the sticker — Amazon licenses Honeywell/Resideo's HVAC platform, so scheduling and aux-heat handling are inherited from the same T-series logic that powers the Honeywell picks, not a from-scratch budget controller. Smart-setback savings still accrue across a 3-year window.

Reviewed calls it "one of the best smart thermostats money can buy, offering similar money-saving smarts and intuitive, habit learning features you'll find on more expensive thermostats." Tom's Guide sums it up as "affordable, attractive and intuitive," and PCMag notes it's "the least expensive model we've tested." ENERGY STAR rebates of $50-$100 can produce an effective price under $40 in many markets.

The trade-offs draw the buyer line cleanly: Alexa-only, no touchscreen, no room-sensor support, and a required C-wire with no adapter in the box. Compared to the breadth picks, it's the budget call. For ecosystem breadth, step up to the ecobee Smart Thermostat Enhanced.

The Sensi Touch 2 earns a normalized 7.5 composite on the SHE Thermostat ROI Score and fills a specific niche: three-ecosystem coverage from the most privacy-forward vendor in the category. Emerson/Copeland's data policy is among the clearest here — they state they do not sell your data — exactly the reassurance a buyer leaving Google over account lock-in wants. You get HomeKit, Alexa and Google together at a mid-range price, with a color touchscreen and a roughly 30-minute DIY install.

TechHive calls it "a very solid high-tech smart thermostat" that "improves on the previous generation and works well," and Reviewed rates it "one of the best smart thermostats we've tested." Two corrections matter, because older roundups got them wrong: the Touch 2 requires a C-wire — a ~$28 adapter kit is sold separately — and its room sensors track temperature and humidity only, with no occupancy detection.

Compared to the Honeywell Home T9 it loses multi-room comfort, and versus the ecobee Smart Thermostat Premium it yields less ecosystem-plus-sensor breadth. But for privacy posture and a familiar interface across all three ecosystems, Sensi is the considered pick.