ThermostandardThermostats matched to the wires on your wall.

Smart · Programmable · Line-voltage · Sensors · Zoning

Start from the wires, not the box.

Tap the terminals that have a wire behind your current thermostat. The check names your system and shows which thermostats their makers say will run it, C wire or not.

Run the wiring checker Compare smart thermostats
A round smart thermostat on a white wall plate, set to 63 degrees
Wire checkTap the terminals behind your thermostat

Single-stage heat and central air with a fan, no C wire

93 thermostats with maker wiring statements

  1. Aqara W200 Smart Thermostat
  2. Bosch BCC100 Smart Thermostat
  3. Cadet 08121 Programmable Thermostat
  4. Emerson 1F97-1277 Programmable Thermostat
  5. Google Nest BH1252 Learning Thermostat
  6. Google Nest BH1254-US Smart Thermostat
  7. Google Nest CE911542 Learning Thermostat
  8. Google Nest G5AJK GJQ8U Learning Thermostat
  9. Google Nest GA01334-CA Smart Thermostat
  10. Google Nest T3007ES Learning Thermostat
  11. Google Nest T4000ES Smart Thermostat
  12. Google Nest T4002ES Smart Thermostat
  13. Google Nest Thermostat 3rd Gen Learning Thermostat
  14. Heagstat H701 Non-Programmable Thermostat
  15. Heagstat H721 Non-Programmable Thermostat
  16. Heagstat H725 Programmable Thermostat
  17. Honeywell Home CT30A1005 Non-Programmable Thermostat
  18. Honeywell Home CT87K1004 Non-Programmable Thermostat
  19. Honeywell Home RCHT8610WF2006/W Smart Thermostat
  20. Honeywell Home RCHT8612WF Smart Thermostat
  21. Honeywell Home RET97E5D1005/U Smart Thermostat
  22. Honeywell Home RTH111B Non-Programmable Thermostat
  23. Honeywell Home RTH11B Non-Programmable Thermostat
  24. Honeywell Home RTH20B Programmable Thermostat
  25. Honeywell Home RTH221B1039 Programmable Thermostat
  26. Honeywell Home RTH2300B1038 Programmable Thermostat
  27. Honeywell Home RTH2510B1018 Programmable Thermostat
  28. Honeywell Home RTH2CWF Smart Thermostat
  29. Honeywell Home RTH5100B Non-Programmable Thermostat
  30. Honeywell Home RTH5160D1003/E Non-Programmable Thermostat
  31. Honeywell Home RTH6350 Programmable Thermostat
  32. Honeywell Home RTH6580WF Smart Thermostat
  33. Honeywell Home RTH7500D Programmable Thermostat
  34. Honeywell Home RTH7560E1001/N Programmable Thermostat
  35. Honeywell Home RTH7600D Programmable Thermostat
  36. Honeywell Home RTH8500D1013/E1 Programmable Thermostat
  37. Honeywell Home RTH8560D1002 Programmable Thermostat
  38. Honeywell Home RTH8580WF Smart Thermostat
  39. Honeywell Home RTH9580WF1005/W1 Smart Thermostat
  40. Honeywell Home RTH9585WF1004/W Smart Thermostat
  41. Honeywell Home RTH9600WF Smart Thermostat
  42. Honeywell Home TH1100DV1000/U Non-Programmable Thermostat
  43. Honeywell Home TH1110DV1009 Non-Programmable Thermostat
  44. Honeywell Home TH2110DV1008 Programmable Thermostat
  45. Honeywell Home TH2210U4005 Programmable Thermostat
  46. Honeywell Home TH4110U2005/U Non-Programmable Thermostat
  47. Honeywell Home TH6100AF2004 Programmable Thermostat
  48. Honeywell Home TH6210U2001 Programmable Thermostat
  49. Honeywell Home TH6220WF2006 Smart Thermostat
  50. Honeywell Home TH6320WF2003/U Programmable Thermostat
  51. Honeywell Home TH6320ZW2003 Smart Thermostat
  52. Honeywell Home TH8110R1008 Programmable Thermostat
  53. Honeywell Home TH8320R1003 Programmable Thermostat
  54. Honeywell Home TH8320WF1029 Smart Thermostat
  55. Honeywell Home TH8321WF1001 Smart Thermostat
  56. Honeywell Home TH9320WF5003 Smart Thermostat
  57. Honeywell Home THP2400A1027W Programmable Thermostat
  58. Honeywell Home THX321WFS2001W Smart Thermostat
  59. Honeywell Home TL7235A1003 Non-Programmable Thermostat
  60. Honeywell Home TL8230A1003 Programmable Thermostat
  61. Honeywell Home X8VMC9W/W Smart Thermostat
  62. Honeywell Home YTH6320R1001 Smart Thermostat
  63. LUX PSP511LC Programmable Thermostat
  64. LUX TX500E Smart Thermostat
  65. LUX TX9600TS Programmable Thermostat
  66. Levoit LTM-A401S-WUS Smart Thermostat
  67. Miuputake STN601-White Non-Programmable Thermostat
  68. Mroinge M701 Non-Programmable Thermostat
  69. Resideo S900 Smart Thermostat
  70. Resideo T6 Pro Programmable Thermostat
  71. Riseem S3001-White Non-Programmable Thermostat
  72. Riseem STN601-Blue Non-Programmable Thermostat
  73. Riseem STN701W-Blue Smart Thermostat
  74. Sensi 1F87U-42WF Smart Thermostat
  75. Sensi ST25 Smart Thermostat
  76. Sensi ST55 Smart Thermostat
  77. Sensi ST75 Smart Thermostat
  78. Sensi ST76 Smart Thermostat
  79. Venstar T7900 Smart Thermostat
  80. Vine TJ-560-3 Smart Thermostat
  81. Vine TJ-919T Smart Thermostat
  82. Vine TJ550 Smart Thermostat
  83. Vine TJ610E Smart Thermostat
  84. White-Rodgers 1F83C-11NP Non-Programmable Thermostat
  85. White-Rodgers 1F83C-11PR Programmable Thermostat
  86. White-Rodgers 1F95-1277 Programmable Thermostat
  87. White-Rodgers 1F95EZ-0671 Programmable Thermostat
  88. ecobee EB-STATE3LTVP2-01 Smart Thermostat
  89. ecobee EB-STATE6-01 Smart Thermostat
  90. ecobee EB-STATE6L-01 Smart Thermostat
  91. ecobee EB-STATE7-01 Smart Thermostat
  92. ecobee EB-STATe3L-01 Smart Thermostat
  93. meross MTS300 Smart Thermostat
Run the full wiring checker

Checkers

Two questions to answer before you buy

Both checkers read the same maker statements as the product pages and say how they decide.

Thermostat wiring checker

Your terminals and system in; the thermostats whose makers support them out, with C-wire needs flagged.

Line-voltage load checker

Heater watts and voltage in; the current your thermostat must carry and the models rated for it.

Five tables

Every control on the wall, and the parts behind it

Each table sets the makers' compatibility statements side by side, with 'Not stated' wherever a listing is silent.

Google Nest GA01334-CA Smart Thermostat48 productsSmart ThermostatsWi-Fi and learning thermostats by C-wire need, heat pump support, stages, sensors and voice assistants.Honeywell Home RTH2300B1038 Programmable Thermostat46 productsProgrammable and Basic ThermostatsProgrammable, non-programmable and millivolt thermostats by schedule, power and system.Honeywell Home CT410B Line-Voltage Thermostat27 productsLine-Voltage ThermostatsThermostats for 120 and 240 V baseboard, wall and floor heat by load, poles and Wi-Fi.Google Nest T5001SF Room Sensor10 productsSensors, C-Wire Adapters and WiringRoom sensors, C-wire adapters, transformers, thermostat wire and wall plates.Aprilaire 4655 Humidistat9 productsZoning and Humidity ControlsZone panels, dampers, humidistats and dehumidistats by zones, voltage and range.

Most-reviewed

Where most shoppers start

See every control
Smart Wi-Fi thermostat · Google Nest

Google Nest GA01334-CA Smart Thermostat

Smart Wi-Fi thermostat

Google Nest
Smart Wi-Fi thermostat · Sensi

Sensi ST55 Smart Thermostat

No C wire needed

Sensi
Programmable · Honeywell Home

Honeywell Home RTH2300B1038 Programmable Thermostat

Heat pump OK

Honeywell Home
Line-voltage · Honeywell Home

Honeywell Home CT410B Line-Voltage Thermostat

120 V · 5,263 W

Honeywell Home

Explainers

Know your wires before you buy

Heat pumpsHeat Pump Thermostats: O/B, Auxiliary Heat and Emergency HeatComfortHot and Cold Rooms: Room Sensors, Zoning and What Each FixesInstallationHow to Replace a Thermostat: The Steps, the Photos and the ChecksComfortHumidistats: Controlling a Whole-House Humidifier or DehumidifierSystemsLine-Voltage vs Low-Voltage Thermostats: Which One Your Heat NeedsSystemsMillivolt Thermostats: Gas Fireplaces, Wall Furnaces and Floor FurnacesIndexAll explainers

Rankings and face-offs

Each ranking states its rule

RankingSmart Thermostats That Work Without a C WireRankingSmart Thermostats for Heat PumpsRankingProgrammable ThermostatsRankingLine-Voltage Thermostats for Baseboard HeatFace-offSensi ST55 Smart Thermostat vs Sensi ST75 Smart ThermostatFace-offSensi ST55 Smart Thermostat vs Sensi ST25 Smart ThermostatFace-offSensi ST75 Smart Thermostat vs Sensi ST76 Smart ThermostatFace-offSensi ST25 Smart Thermostat vs Sensi ST75 Smart Thermostat
A bright modern living room with a grey sofa and large windows

ENERGY STAR puts the average saving from a qualifying smart thermostat at about 8% of heating and cooling bills. The thermostat that delivers it is the one that actually runs your system.

How Thermostandard compares

Your system first, then the maker's word

Wires before features

A thermostat that can't run your system is the wrong one, however good its app. Every page leads with the maker's C-wire, heat pump, stage and voltage statements.

Silence isn't a yes

When a listing doesn't say whether it supports something your system needs, we show 'Not stated' and send you to the maker's checker, rather than guess.

Savings quoted, never promised

ENERGY STAR's smart thermostat figures are quoted as averages from their source. Line-voltage and furnace work is flagged for a licensed pro. How we read a thermostat.