The short version: The Ecobee SmartThermostat Premium is the most fully-featured smart thermostat sold in the US, combining a bundled room sensor, a built-in air quality monitor, and native Apple HomeKit support that no Nest model offers. At $329.99, it costs more than most competitors, but for a multi-room forced-air home it’s the thermostat other reviewers keep naming as their top pick.

It’s not the right buy for every home. If you don’t need the air quality monitor or a built-in speaker, the cheaper Ecobee Enhanced gets you most of the same comfort control for less.

Who It’s For

The Premium is built for homes with central forced-air heating and cooling: gas furnaces, heat pumps (including dual-fuel setups), central AC, and most multi-stage systems. It does not work with electric baseboard heaters — for that, line-voltage thermostats like Mysa or Stelpro are the right category.

It’s the strongest pick for:
– Larger homes where the hallway thermostat location doesn’t reflect the bedroom or living room temperature
– Households already invested in Apple HomeKit, since Ecobee is the only major smart thermostat brand with native support
– Anyone who wants indoor air quality tracking (VOC and CO₂) alongside temperature control
– Buyers who want Alexa or Siri voice control built into the thermostat itself, without adding an Echo or HomePod

Design & Build

The Premium uses a 3.5-inch color touchscreen in a white housing about the size of a deck of cards. Ecobee’s current generation added radar-based motion and occupancy sensing directly in the thermostat body, on top of the included SmartSensor puck, so it can pick up on room activity even before a remote sensor does. The screen is bright and legible from across a room, and navigation is swipe-and-tap rather than a dial — it takes a few days to feel natural if you’re coming from an older thermostat.

The mounting plate goes on the wall first, and the thermostat snaps onto it magnetically, which makes it simple to pull off for wiring troubleshooting later.

Setup & Compatibility

C-wire situation: Ecobee includes a Power Extender Kit (PEK) in the box for homes without a C-wire. It installs at the furnace or air handler and takes most people 20–30 minutes. The in-app wiring guide matches diagrams to your actual terminal labels, which is a big part of why Ecobee has a reputation for DIY-friendly installs.

System compatibility: Works with single- and multi-stage gas furnaces, heat pumps (standard and dual-fuel), central AC, and most zoned systems. Run Ecobee’s online compatibility checker first if your system is anything non-standard (dual transformer, high-voltage, or heavily zoned setups).

App setup: The guided install in the Ecobee app is clear about what each wire does and flags likely wiring problems before you finish. First-time installers routinely complete it without calling a pro.

App & Ecosystem

The Ecobee app is consistently rated among the best in the category for schedule building and energy reporting — it shows actual runtime and usage patterns instead of vague “efficiency scores.”

eco+ is Ecobee’s background optimization layer. It uses weather forecasts to pre-heat or pre-cool, adjusts for detected occupancy, and can opt into utility demand-response events where your utility participates. It runs quietly; you notice it in the utility bill more than in day-to-day operation.

Ecosystem support:
– Apple HomeKit: Full native support — Ecobee’s biggest differentiator versus Nest
– Google Assistant: Supported
– Amazon Alexa: Built into the thermostat itself, with a physical speaker and mic
– Samsung SmartThings: Supported

Room Sensors and Air Quality: The Premium’s Real Differentiators

A SmartSensor is a small puck that reads temperature and occupancy in whichever room you place it. Since the thermostat itself usually sits in a hallway, this is what lets Ecobee prioritize comfort in the bedroom at night instead of chasing the hallway temperature. One SmartSensor ships in the box; additional ones run about $79 each, and larger homes benefit from two or three placed in the rooms you actually use.

The built-in air quality monitor tracks VOCs and CO₂ and surfaces the readings in the app. It’s a genuine extra for households with allergies, asthma, or wildfire-smoke concerns, though it’s a monitoring feature only — it doesn’t drive HVAC behavior the way temperature sensing does. Buyer feedback on the built-in speaker is mixed: it’s functional for Alexa and Siri Shortcuts, but reviewers and owners commonly note the audio quality is closer to a smart speaker on a budget than a dedicated Echo or HomePod.

Price & Value

Ecobee SmartThermostat Premium
Price (USD) $329.99
Included sensors 1 SmartSensor
Warranty 3 years
Subscription required No

Retailer ratings for the Premium tend to sit in the mid-4-star range with review counts in the hundreds on sites like Walmart — worth checking current numbers before buying since they shift over time. The Premium is frequently named a top pick by independent outlets like Wirecutter and CNET for households that want the most complete feature set in one box.

For rebate eligibility, Ecobee shows up on more US utility qualifying lists than most competitors thanks to its ENERGY STAR certification across the current lineup. See Smart Thermostat Rebate by State for what’s available where you live — specific dollar amounts vary too much by utility to generalize here.

Pros & Cons

Pros:
– Best-in-class scheduling app and energy reporting
– Native Apple HomeKit support, unmatched by Nest
– PEK included, so most homes skip a separate C-wire install
– Included SmartSensor addresses the classic “hallway thermostat, bedroom comfort” mismatch
– Built-in Alexa/Siri speaker means no separate smart speaker needed
– 3-year warranty, longer than Nest’s

Cons:
– $329.99 is a real premium over the Enhanced ($170–250) for features some households won’t use
– Built-in speaker’s audio quality draws mixed feedback
– Air quality monitor is informational only, doesn’t adjust HVAC behavior
– Doesn’t support electric baseboard heat

Ecobee models compared: Premium, Enhanced, and Ecobee3 Lite, with features, price, and rebate eligibility

The Recommendation

Buy the Ecobee SmartThermostat Premium if you want the most complete smart thermostat available, you’re in the Apple ecosystem, or you’ll actually use the air quality monitor and built-in speaker.

Consider the Enhanced instead if you want Ecobee’s core comfort features — HomeKit, PEK, solid scheduling — without paying for the sensor, air monitor, and speaker bundled in.

For comparisons: Ecobee Premium vs Nest Learning Thermostat and Ecobee Premium vs Enhanced: Which Should You Buy?

Frequently Asked Questions

Is the Ecobee SmartThermostat Premium worth the extra cost over the Enhanced?
It depends on whether you’d buy a SmartSensor separately anyway. A single sensor costs close to the price difference between the two models, so if you know you need one, the Premium effectively includes it for close to the same total cost. If you don’t need a sensor or the air quality monitor, the Enhanced is the better value.

Does the Premium require a C-wire?
No. It ships with a Power Extender Kit that handles power in homes without one, with step-by-step in-app installation.

Does it work with Apple HomeKit?
Yes, natively, on both the Premium and Enhanced. This is Ecobee’s main advantage over Google Nest, which doesn’t support HomeKit at all.

Does the Premium work with heat pumps?
Yes, including dual-fuel systems that pair a heat pump with a gas furnace. You set the outdoor balance point for auxiliary heat in the app and Ecobee manages the switchover.

How good is the built-in air quality monitor?
It reliably reports VOC and CO₂ trends in the app, but it’s a monitoring feature, not a control feature — it won’t automatically run your HVAC system differently based on air quality readings.

Is there a monthly subscription fee?
No. Scheduling, the included sensor, eco+, and remote access are all included with no subscription required.