Smart Thermostats / Mysa Smart Thermostat LITE for Electric Baseboard Heaters vs Sensi Lite (ST25)
Mysa Smart Thermostat LITE for Electric Baseboard Heaters vs Sensi Lite (ST25)
Sensi Lite (ST25)
The cheapest truly C-wire-free thermostat — until you own a heat pump, and then it isn't.
Wins overall by 0.1 points
Quick Verdict
The Sensi Lite (ST25) wins by 0.1 points, which is not enough to settle it. Baseboard control under $100: same switching as the V2, none of its sensors. Pick on the specs that matter to you, not the overall score.
The Mysa Smart Thermostat LITE for Electric Baseboard Heaters and Sensi Lite (ST25) are both current-generation smart Thermostat models, and the Sensi Lite (ST25) is $20 cheaper than the Mysa Smart Thermostat LITE for Electric Baseboard Heaters ($79 vs $99). On HVAC Coverage, the Sensi Lite (ST25) leads (6.5 vs 3.0/10) — stages of heating and cooling, heat pump and auxiliary heat handling, and humidifier / dehumidifier / ventilator terminals. On Smart Home Integration, the Mysa Smart Thermostat LITE for Electric Baseboard Heaters leads (6.5 vs 4.0/10) — matter, Apple Home, Alexa and Google support — and how much each one actually exposes. On Multi-Room Sensing, the Mysa Smart Thermostat LITE for Electric Baseboard Heaters leads (3.0 vs 1.0/10) — remote sensors: included or extra, how many pair, and whether they read occupancy or only temperature. Overall, the Sensi Lite (ST25) scores 5.9/10 across our 8 scoring categories versus 5.8/10 for the Mysa Smart Thermostat LITE for Electric Baseboard Heaters, 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 | Mysa Smart Thermostat LITE for Electric Baseboard Heaters | Sensi Lite (ST25) |
|---|---|---|
| Price | $99.00 | $79.00 |
| Release Year | 2023 | 2023 |
| System Voltage | Line voltage 120V or 240V AC, 16A maximum — 3,800W at 240V or 1,900W at 120V, identical to the V2. Not compatible with any 24V system | Low voltage 24VAC (20-30VAC, 50/60Hz). Not for 120/240V line-voltage heat |
| C-Wire Required | Not applicable — line voltage. Both line conductors must be present in the gang box | 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 |
| Adapter / Power Kit Included | Not applicable | No adapter is included, and none is needed on the majority of conventional systems |
| Heating & Cooling Stages | Heating only, on/off line-voltage switching. No cooling and no staging | 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 |
| Heat Pump & Aux Heat | No. Same exclusions as the V2: no 24V furnaces or central air, no millivolt, no central hydronic boilers, no electric in-floor heating | 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 |
| Humidifier / Ventilator Terminals | None | None — no humidifier, dehumidifier or ventilator output |
| Remote Sensors | None. One thermostat per heater circuit | None. Copeland states only the Sensi Touch 2 works with Sensi Room Sensors |
| Occupancy Detection | None. The LITE drops the V2's light and proximity sensors entirely, and there is no humidity sensor either. Away control is app geofencing | None. Away control is geofencing from your phone only |
| Matter Support | Not listed for the baseboard models | No |
| Voice & Smart Home Platforms | Mysa app, Apple HomeKit, Amazon Alexa, Google Home | Sensi app, Amazon Alexa, Google Assistant, Samsung SmartThings. No Apple Home |
| Utility Rebates & Demand Response | Mysa states the LITE supports utility demand-response programs and it is stocked in US utility rebate marketplaces | ENERGY STAR certified, rated for about 23% HVAC energy savings, and stocked across US utility rebate marketplaces |
| Account or Subscription Needed | No subscription | No subscription. A free Sensi account is required |
| Warranty | 60 months | 36 months |
| Colors | White | Black (ST25), White (ST25W) |
Category Scores
C-Wire Freedom
The Sensi Lite (ST25) leads clearly here, 8.0 against 7.5 — a 0.5-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 Mysa Smart Thermostat LITE for Electric Baseboard Heaters does not close the gap elsewhere.
HVAC Coverage
The Sensi Lite (ST25) leads clearly here, 6.5 against 3.0 — a 3.5-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 Mysa Smart Thermostat LITE for Electric Baseboard Heaters does not close the gap elsewhere.
Multi-Room Sensing
The Mysa Smart Thermostat LITE for Electric Baseboard Heaters leads clearly here, 3.0 against 1.0 — a 2.0-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 Mysa Smart Thermostat LITE for Electric Baseboard Heaters leads clearly here, 6.5 against 4.0 — a 2.5-point margin on matter, Apple Home, Alexa and Google support — and how much each one actually exposes. If that is what you are buying for, the Sensi Lite (ST25) does not close the gap elsewhere.
Scheduling & Learning
The Mysa Smart Thermostat LITE for Electric Baseboard Heaters leads clearly here, 6.0 against 5.0 — a 1.0-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 Mysa Smart Thermostat LITE for Electric Baseboard Heaters and Sensi Lite (ST25) are level here, at 5.0/10 each. screen quality and how much you can do at the wall instead of in the phone app is not what separates these two — look to the categories where the scores diverge.
Installation
The Sensi Lite (ST25) leads clearly here, 8.5 against 6.5 — a 2.0-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 Mysa Smart Thermostat LITE for Electric Baseboard Heaters does not close the gap elsewhere.
Value
The Sensi Lite (ST25) leads clearly here, 9.0 against 8.5 — a 0.5-point margin on what the money buys once accessories, adapters and sensors are added in. If that is what you are buying for, the Mysa Smart Thermostat LITE for Electric Baseboard Heaters does not close the gap elsewhere.
Best For
Choose the Mysa Smart Thermostat LITE for Electric Baseboard Heaters if…
- • Smart Home Integration matters most to you — the Mysa Smart Thermostat LITE for Electric Baseboard Heaters scores 6.5/10 here (matter, Apple Home, Alexa and Google support — and how much each one actually exposes).
- • Multi-Room Sensing matters most to you — the Mysa Smart Thermostat LITE for Electric Baseboard Heaters scores 3.0/10 here (remote sensors: included or extra, how many pair, and whether they read occupancy or only temperature).
- • Scheduling & Learning matters most to you — the Mysa Smart Thermostat LITE for Electric Baseboard Heaters scores 6.0/10 here (learning, geofencing, away detection and how much of it works without babysitting the app).
- • Your main use case is line-voltage or multi-room.
Choose the Sensi Lite (ST25) if…
- • HVAC Coverage matters most to you — the Sensi Lite (ST25) scores 6.5/10 here (stages of heating and cooling, heat pump and auxiliary heat handling, and humidifier / dehumidifier / ventilator terminals).
- • Installation matters most to you — the Sensi Lite (ST25) scores 8.5/10 here (wiring complexity, guided setup, and how likely a DIY install is to end in a service call).
- • You want to spend less — it's $20 cheaper.
- • Your main use case is no-c-wire or heat-pump.
Pros & Cons
Mysa Smart Thermostat LITE for Electric Baseboard Heaters
Pros
- +Under $100 for a real line-voltage smart thermostat with HomeKit, Alexa and Google support and a 5-year warranty
- +Identical 16A / 3,800W switching capability to the $159 V2 — you lose features, not capacity
- +Physically the smallest thermostat here, which matters when you are fitting several in one apartment
- +Launched at $109 in 2023 and now sells for $99, one of the few products here whose price has gone down
Cons
- −No energy monitoring, no humidity sensor and no light or proximity sensors — the V2's whole value-add is stripped out
- −Buttons rather than a touchscreen, and Mysa's app carries most of the configuration
- −Heating only. No cooling, no staging, no accessory control
- −No Matter on the baseboard line
- −Still one unit per heater circuit, so a whole-home baseboard retrofit is a multi-hundred-dollar project
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
Shop by Need
FAQs
Is the Mysa Smart Thermostat LITE for Electric Baseboard Heaters or Sensi Lite (ST25) better overall?+
Based on our 8-category scoring, the Sensi Lite (ST25) 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 HVAC Coverage, the Mysa Smart Thermostat LITE for Electric Baseboard Heaters or the Sensi Lite (ST25)?+
The Sensi Lite (ST25) scores higher on HVAC Coverage (6.5/10 vs 3.0/10) — stages of heating and cooling, heat pump and auxiliary heat handling, and humidifier / dehumidifier / ventilator terminals.
Which is better for Smart Home Integration, the Mysa Smart Thermostat LITE for Electric Baseboard Heaters or the Sensi Lite (ST25)?+
The Mysa Smart Thermostat LITE for Electric Baseboard Heaters scores higher on Smart Home Integration (6.5/10 vs 4.0/10) — matter, Apple Home, Alexa and Google support — and how much each one actually exposes.
Which is better for Multi-Room Sensing, the Mysa Smart Thermostat LITE for Electric Baseboard Heaters or the Sensi Lite (ST25)?+
The Mysa Smart Thermostat LITE for Electric Baseboard Heaters scores higher on Multi-Room Sensing (3.0/10 vs 1.0/10) — remote sensors: included or extra, how many pair, and whether they read occupancy or only temperature.
Which is better for Installation, the Mysa Smart Thermostat LITE for Electric Baseboard Heaters or the Sensi Lite (ST25)?+
The Sensi Lite (ST25) scores higher on Installation (8.5/10 vs 6.5/10) — wiring complexity, guided setup, and how likely a DIY install is to end in a service call.
Is the Mysa Smart Thermostat LITE for Electric Baseboard Heaters worth the price difference over the Sensi Lite (ST25)?+
The Sensi Lite (ST25) is the cheaper option at $79 versus $99. Whether the pricier model is "worth it" depends on how much you value its lead in HVAC Coverage.
Which is better suited to my use case?+
The Mysa Smart Thermostat LITE for Electric Baseboard Heaters is the better fit if you mainly care about line-voltage or multi-room. The Sensi Lite (ST25) is the better fit for no-c-wire or heat-pump.
What's the warranty on the Mysa Smart Thermostat LITE for Electric Baseboard Heaters vs the Sensi Lite (ST25)?+
The Mysa Smart Thermostat LITE for Electric Baseboard Heaters ships with a 60-month warranty; the Sensi Lite (ST25) 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.
Cheaper Option
Honeywell Home X2S (RTH2CWF) — $79.99
Premium Option
Honeywell Home X2S (RTH2CWF) — $79.99
Specifications and prices for both products last verified . Scores are calculated from published specifications — see how we compare products.