The short version: The Sensi Touch ST75 is a mid-range touchscreen thermostat that undercuts ecobee and Nest by $50-100 while covering most of the same ground: a 5-inch color display, Alexa/Google/HomeKit/SmartThings support, and ENERGY STAR certification. It needs a C-wire, which its cheaper sibling (Sensi Lite) doesn’t, and it skips the room-sensor ecosystem that makes ecobee’s Premium worth the extra money. For a straightforward forced-air home without a lot of hands-on tinkering, it’s a solid buy.

Note: Emerson’s residential thermostat business was acquired by Copeland, so current retail listings show both “Emerson Sensi” and “Copeland Sensi” branding on what is the same hardware line. Don’t be thrown off if the box or listing says Copeland instead of Emerson.

Who It’s For

The Sensi Touch fits:
– Forced-air homes with single or dual-stage gas, electric, or heat pump systems
– Buyers who want a touchscreen without paying ecobee/Nest prices
– Alexa or Google Home households, and to a lesser extent Apple Home users since the ST75 does support HomeKit
– Homes that already have a C-wire, or are willing to run one — this model doesn’t do without it the way the Sensi Lite and ST55 do

It’s not the pick if you want room-by-room sensors (ecobee owns that space) or if you’re avoiding a C-wire installation entirely (look at the Sensi Lite or ST55 instead, both covered in our other reviews).

Design & Build

The Sensi Touch uses a 5-inch color touchscreen, larger than Honeywell’s T9/T10 Pro displays and comparable in size to ecobee’s. The housing is a simple white square that sits flush to the wall, less visually distinctive than ecobee’s rounded-corner design or Nest’s glass dial, but unobtrusive. Reviewers who’ve handled it in person generally rate the build as solid rather than premium — plastic housing, but nothing that feels cheap.

Setup & Compatibility

C-wire required. This is the ST75’s main practical limitation next to Sensi Lite and ST55: it needs continuous power, so a C-wire (or a compatible add-on adapter, sold separately) is mandatory. If your existing thermostat doesn’t have one, factor that into the install.

Installation otherwise runs about 30 minutes for someone comfortable with basic thermostat wiring — Sensi’s app walks through wire labeling and terminal matching. It’s rated for most single and dual-stage forced-air systems, including heat pump setups. Run your specific system through Sensi’s online compatibility checker before buying if you have anything non-standard (zoned, geothermal, high-voltage).

App & Ecosystem

The Sensi app covers standard 7-day scheduling, remote temperature control, and basic energy-usage estimates. It’s less polished than ecobee’s app and doesn’t offer the granular actual-consumption reporting ecobee provides, but reviewers consistently describe it as functional and easy enough for a first-time smart thermostat buyer to figure out without help.

Ecosystem support is broader than most competitors in this price range:
– Amazon Alexa — voice control
– Google Assistant — voice control
– Apple HomeKit — supported (a genuine differentiator; most sub-$200 thermostats skip this)
– Samsung SmartThings — supported

HomeKit support at this price point is unusual — Honeywell’s T9/T10 line doesn’t offer it at all, and it’s one reason the ST75 gets picked over otherwise-comparable Honeywell models by Apple Home households.

Touchscreen & Everyday Use

Independent coverage (Consumer Reports, Best Buy customer reviews, and dedicated thermostat review sites) is generally positive: reviewers describe the ST75 as easy to install, easy to use day-to-day, and reliable once set up, with the touchscreen a clear step up from Sensi’s non-touch models. The most commonly cited drawback isn’t the screen — it’s the C-wire requirement itself, which trips up buyers who assumed the “smart thermostat” upgrade would be battery-powered like the Sensi Lite.

Price & Value

Item Price (USD)
Sensi Touch ST75 ~$130-200
ecobee Enhanced (for comparison) ~$170-250
Nest Thermostat (2020) (for comparison) ~$130-170

Street price on the ST75 typically lands in the $150-180 range, with Best Buy, Home Depot, Lowe’s, and Amazon all stocking it and running periodic discounts. It sits squarely between the Nest Thermostat (2020) and ecobee’s Enhanced on price, while matching or beating both on HomeKit support. Prices shift with retailer promotions, so check current pricing before assuming a figure.

Pros & Cons

Pros:
– 5-inch color touchscreen at a below-ecobee/Nest price
– Apple HomeKit support, rare in this price tier
– ENERGY STAR certified
– Straightforward app-guided install
– Alexa, Google Assistant, and SmartThings support

Cons:
– C-wire required — no battery-power fallback like Sensi Lite/ST55
– No room-sensor ecosystem
– App is functional but less detailed than ecobee’s energy reporting
– Emerson/Copeland brand transition means some retail listings are inconsistently labeled

Sensi Touch ST75 vs Sensi Lite vs Sensi Touch 2 vs Sensi ST55: features, price, and C-wire requirements compared

The Recommendation

Buy the Sensi Touch ST75 if you have a C-wire (or don’t mind installing one), want a touchscreen, and want HomeKit/Alexa/Google support without paying ecobee or Nest prices. If you don’t have a C-wire, look at the Sensi Lite or ST55 instead — see our reviews of both. If you want room-by-room sensors, ecobee’s Enhanced is the better spend.

Frequently Asked Questions

Does the Sensi Touch ST75 need a C-wire?
Yes. Unlike the Sensi Lite and ST55, which can run on batteries, the ST75 requires a C-wire or a compatible add-on adapter for continuous power.

Is Sensi Touch the same as Emerson Sensi or Copeland Sensi?
Yes. Emerson’s thermostat business was acquired by Copeland, so current listings for the same hardware appear under both the Emerson and Copeland names depending on the retailer and when the listing was last updated.

Does the Sensi Touch work with Apple HomeKit?
Yes. It’s one of the few thermostats under $200 with native HomeKit support, alongside Alexa, Google Assistant, and SmartThings.

How does the Sensi Touch compare to ecobee?
ecobee’s Enhanced and Premium offer better app energy reporting and a room-sensor ecosystem the Sensi Touch doesn’t have. The Sensi Touch is generally cheaper and still covers touchscreen control and the major voice assistants, making it the better pick if you don’t need sensors.

Is the Sensi Touch ENERGY STAR certified?
Yes, which is the baseline requirement for most utility and state rebate programs. Check Smart Thermostat Rebate by State before assuming a specific rebate applies, since eligibility varies by state and utility.

Where can I buy the Sensi Touch ST75 in the US?
Best Buy, Home Depot, Lowe’s, and Amazon.com all carry it, with pricing that fluctuates with retailer promotions.