Smart Thermostats / Sensi Lite (ST25) vs Sensi Touch 2 (ST76)
Sensi Lite (ST25) vs Sensi Touch 2 (ST76)
Sensi Touch 2 (ST76)
Deep multi-stage and heat-pump wiring for under $200, with no Matter and no Apple Home.
Wins overall by 0.1 points
Quick Verdict
The Sensi Touch 2 (ST76) wins by 0.1 points, which is not enough to settle it. The cheapest truly C-wire-free thermostat — until you own a heat pump, and then it isn't. Pick on the specs that matter to you, not the overall score.
The Sensi Lite (ST25) and Sensi Touch 2 (ST76) are both closely matched smart Thermostat models, and the Sensi Lite (ST25) is $110 cheaper than the Sensi Touch 2 (ST76) ($79 vs $189). On C-Wire Freedom, the Sensi Lite (ST25) leads (8.0 vs 2.0/10) — how likely this thermostat is to run on the wiring you already have — whether it needs a common wire, and whether the workaround is in the box, sold separately, or an electrician's visit. The single biggest cause of returns in this category.. On Multi-Room Sensing, the Sensi Touch 2 (ST76) leads (4.5 vs 1.0/10) — remote sensors: included or extra, how many pair, and whether they read occupancy or only temperature. On HVAC Coverage, the Sensi Touch 2 (ST76) leads (9.0 vs 6.5/10) — stages of heating and cooling, heat pump and auxiliary heat handling, and humidifier / dehumidifier / ventilator terminals. Overall, the Sensi Touch 2 (ST76) scores 6.0/10 across our 8 scoring categories versus 5.9/10 for the Sensi Lite (ST25), though the gap is close enough that your specific use case should decide it. Below, we break down the full spec sheet, category-by-category scores, and exactly who should buy which one.
Side-by-Side Comparison
| Spec | Sensi Lite (ST25) | Sensi Touch 2 (ST76) |
|---|---|---|
| Price | $79.00 | $189.00 |
| Release Year | 2023 | 2022 |
| System Voltage | Low voltage 24VAC (20-30VAC, 50/60Hz). Not for 120/240V line-voltage heat | Low voltage 24VAC — gas, oil, electric, heat pump, boilers. Not for 120/240V line-voltage heat |
| C-Wire Required | Mostly no — and Copeland is unusually honest about the exception. Its own product title reads 'C-Wire Not Required, Except On Heat/Cool Only and Heat Pump Systems', and the manual confirms heat-only, cool-only and heat pump systems all need a common wire | Yes. Copeland's spec sheet requires 20-30VAC between RH/RC and C, and every retail listing is labelled 'C-Wire Required' |
| Adapter / Power Kit Included | No adapter is included, and none is needed on the majority of conventional systems | No — the Sensi C-Wire Kit is a separate purchase at roughly $28 |
| Heating & Cooling Stages | 2H/1C or 1H/2C, single and multi-stage, gas, oil or electric. Ten terminals: R, C, W/E, G, Y, O/B, Y2, W2, L and AUX, rated 1.5A per terminal and 2.5A total | 1H/1C, 2H/2C multi-stage, and up to 4H/2C on heat pumps |
| Heat Pump & Aux Heat | Yes — heat pump 2H/1C, and the manual lists dual fuel and zone valve configurations. A heat pump does need a C wire on this model | Yes — up to 4 heat and 2 cool including auxiliary stages, the widest heat-pump staging here alongside the ecobee Premium |
| Humidifier / Ventilator Terminals | None — no humidifier, dehumidifier or ventilator output | ACC+/ACC- terminals drive a humidifier or dehumidifier, with a humidify range of 5-50% RH and dehumidify 40-95% RH |
| Remote Sensors | None. Copeland states only the Sensi Touch 2 works with Sensi Room Sensors | Sensi Room Sensors at about $40 each, sold separately. Copeland states only the Touch 2 (ST76 / 1F96U series) supports them and does not publish a maximum count |
| Occupancy Detection | None. Away control is geofencing from your phone only | None. TechHive's review notes the Sensi Room Sensor reads ambient temperature and humidity and has no motion detection, unlike competitors' sensors |
| Matter Support | No | No. TechHive states the Touch 2 supports neither Matter nor Apple HomeKit |
| Voice & Smart Home Platforms | Sensi app, Amazon Alexa, Google Assistant, Samsung SmartThings. No Apple Home | Sensi app, Amazon Alexa, Google Assistant and Samsung SmartThings. No Apple Home |
| Utility Rebates & Demand Response | ENERGY STAR certified, rated for about 23% HVAC energy savings, and stocked across US utility rebate marketplaces | ENERGY STAR certified; Copeland runs Sensi demand-response partnerships with utilities and the thermostat is widely rebated |
| Account or Subscription Needed | No subscription. A free Sensi account is required | No subscription, and Copeland markets an explicit 'we do not sell your data' privacy position |
| Warranty | 36 months | 36 months |
| Colors | Black (ST25), White (ST25W) | Black (ST76), White beveled edge (ST76W) |
Category Scores
C-Wire Freedom
The Sensi Lite (ST25) leads clearly here, 8.0 against 2.0 — a 6.0-point margin on how likely this thermostat is to run on the wiring you already have — whether it needs a common wire, and whether the workaround is in the box, sold separately, or an electrician's visit. The single biggest cause of returns in this category.. If that is what you are buying for, the Sensi Touch 2 (ST76) does not close the gap elsewhere.
HVAC Coverage
The Sensi Touch 2 (ST76) leads clearly here, 9.0 against 6.5 — a 2.5-point margin on stages of heating and cooling, heat pump and auxiliary heat handling, and humidifier / dehumidifier / ventilator terminals. If that is what you are buying for, the Sensi Lite (ST25) does not close the gap elsewhere.
Multi-Room Sensing
The Sensi Touch 2 (ST76) leads clearly here, 4.5 against 1.0 — a 3.5-point margin on remote sensors: included or extra, how many pair, and whether they read occupancy or only temperature. If that is what you are buying for, the Sensi Lite (ST25) does not close the gap elsewhere.
Smart Home Integration
The Sensi Lite (ST25) and Sensi Touch 2 (ST76) are level here, at 4.0/10 each. matter, Apple Home, Alexa and Google support — and how much each one actually exposes is not what separates these two — look to the categories where the scores diverge.
Scheduling & Learning
The Sensi Touch 2 (ST76) leads clearly here, 6.5 against 5.0 — a 1.5-point margin on learning, geofencing, away detection and how much of it works without babysitting the app. If that is what you are buying for, the Sensi Lite (ST25) does not close the gap elsewhere.
Display & On-Device Control
The Sensi Touch 2 (ST76) leads clearly here, 7.5 against 5.0 — a 2.5-point margin on screen quality and how much you can do at the wall instead of in the phone app. If that is what you are buying for, the Sensi Lite (ST25) does not close the gap elsewhere.
Installation
The Sensi Lite (ST25) leads clearly here, 8.5 against 7.0 — a 1.5-point margin on wiring complexity, guided setup, and how likely a DIY install is to end in a service call. If that is what you are buying for, the Sensi Touch 2 (ST76) does not close the gap elsewhere.
Value
The Sensi Lite (ST25) leads clearly here, 9.0 against 7.5 — a 1.5-point margin on what the money buys once accessories, adapters and sensors are added in. If that is what you are buying for, the Sensi Touch 2 (ST76) does not close the gap elsewhere.
Best For
Choose the Sensi Lite (ST25) if…
- • C-Wire Freedom matters most to you — the Sensi Lite (ST25) scores 8.0/10 here (how likely this thermostat is to run on the wiring you already have — whether it needs a common wire, and whether the workaround is in the box, sold separately, or an electrician's visit. The single biggest cause of returns in this category.).
- • You want to spend less — it's $110 cheaper.
- • Your main use case is budget or no-c-wire.
Choose the Sensi Touch 2 (ST76) if…
- • Multi-Room Sensing matters most to you — the Sensi Touch 2 (ST76) scores 4.5/10 here (remote sensors: included or extra, how many pair, and whether they read occupancy or only temperature).
- • HVAC Coverage matters most to you — the Sensi Touch 2 (ST76) scores 9.0/10 here (stages of heating and cooling, heat pump and auxiliary heat handling, and humidifier / dehumidifier / ventilator terminals).
- • Display & On-Device Control matters most to you — the Sensi Touch 2 (ST76) scores 7.5/10 here (screen quality and how much you can do at the wall instead of in the phone app).
- • Scheduling & Learning matters most to you — the Sensi Touch 2 (ST76) scores 6.5/10 here (learning, geofencing, away detection and how much of it works without babysitting the app).
- • Your main use case is multi-room.
Pros & Cons
Sensi Lite (ST25)
Pros
- +One of only three thermostats here that runs without a C wire on ordinary conventional systems, and by far the cheapest
- +Ten terminals including AUX and L, with dual-fuel and zone-valve support that no other sub-$100 model here documents
- +Copeland spells out the C-wire exception in the product title itself instead of burying it in a compatibility checker
- +$79 street against $89.99 list, with heavy utility-marketplace rebate availability
Cons
- −The C-wire exemption evaporates exactly where it matters: heat-only, cool-only and heat pump systems all need one
- −No Apple Home and no Matter, so it is Alexa, Google or the Sensi app and nothing else
- −No room sensor support at all — Copeland reserves Sensi Room Sensors for the Touch 2
- −No humidifier or ventilator terminals despite the generous terminal count
- −No trim plate and no battery backup — the manual states there is no battery option, so a blown 24V fuse leaves the screen dark
Sensi Touch 2 (ST76)
Pros
- +4H/2C heat pump staging plus humidifier and dehumidifier terminals — genuinely serious HVAC coverage for under $200
- +3-year warranty and a published privacy stance that no other brand here makes explicit
- +Street price has settled around $189 against a $209.99 list, and it periodically drops much further
- +Real multi-stage and dual-fuel handling that the similarly priced Nest Thermostat and ecobee Essential do not offer
Cons
- −No Matter and no Apple HomeKit — the Touch 2 dropped the HomeKit support the original Sensi Touch had
- −C wire required and the C-Wire Kit is a ~$28 extra, where ecobee includes an equivalent kit free
- −Sensi Room Sensors are $40 each, sold separately, and detect temperature and humidity only — no occupancy
- −No decorative trim plate in the box, so old paint outlines and screw holes show
- −Copeland does not publish how many room sensors can pair, which makes planning a multi-room setup guesswork
Shop by Need
FAQs
Is the Sensi Lite (ST25) or Sensi Touch 2 (ST76) better overall?+
Based on our 8-category scoring, the Sensi Touch 2 (ST76) comes out ahead overall. See the full breakdown in the scores section above — the right pick still depends on which categories matter most for your use case.
Which is better for C-Wire Freedom, the Sensi Lite (ST25) or the Sensi Touch 2 (ST76)?+
The Sensi Lite (ST25) scores higher on C-Wire Freedom (8.0/10 vs 2.0/10) — how likely this thermostat is to run on the wiring you already have — whether it needs a common wire, and whether the workaround is in the box, sold separately, or an electrician's visit. The single biggest cause of returns in this category..
Which is better for Multi-Room Sensing, the Sensi Lite (ST25) or the Sensi Touch 2 (ST76)?+
The Sensi Touch 2 (ST76) scores higher on Multi-Room Sensing (4.5/10 vs 1.0/10) — remote sensors: included or extra, how many pair, and whether they read occupancy or only temperature.
Which is better for HVAC Coverage, the Sensi Lite (ST25) or the Sensi Touch 2 (ST76)?+
The Sensi Touch 2 (ST76) scores higher on HVAC Coverage (9.0/10 vs 6.5/10) — stages of heating and cooling, heat pump and auxiliary heat handling, and humidifier / dehumidifier / ventilator terminals.
Which is better for Display & On-Device Control, the Sensi Lite (ST25) or the Sensi Touch 2 (ST76)?+
The Sensi Touch 2 (ST76) scores higher on Display & On-Device Control (7.5/10 vs 5.0/10) — screen quality and how much you can do at the wall instead of in the phone app.
Is the Sensi Lite (ST25) worth the price difference over the Sensi Touch 2 (ST76)?+
The Sensi Lite (ST25) is the cheaper option at $79 versus $189. Whether the pricier model is "worth it" depends on how much you value its lead in C-Wire Freedom.
Which is better suited to my use case?+
The Sensi Lite (ST25) is the better fit if you mainly care about budget or no-c-wire. The Sensi Touch 2 (ST76) is the better fit for multi-room.
What's the warranty on the Sensi Lite (ST25) vs the Sensi Touch 2 (ST76)?+
The Sensi Lite (ST25) ships with a 36-month warranty; the Sensi Touch 2 (ST76) ships with a 36-month warranty. Always confirm current terms on the manufacturer's site before buying.
Should I wait for the next model instead of buying either of these?+
If either model is more than two years old, a successor may be close — check the "Latest Model" link on each product page. Otherwise, both are current, well-supported options and there's no strong reason to wait.
Premium Option
ecobee Smart Thermostat Enhanced (EB-STATE6L-01) — $199.99
Specifications and prices for both products last verified . Scores are calculated from published specifications — see how we compare products.