Honeywell Home T4From real comments

Verdict distilled from 57 mentions across 11 aspects in comments under product review videos.

Positive sentiment19%
PROS 19%
CONS 81%

Rank based on 57 mentions across 11 aspects

View the verdict as

Buy this if...

  • You're comfortable digging into ISU advanced setup menus or watching tutorial videos to unlock full functionality
  • You want optimum start/stop scheduling that can lower heating bills over time
  • You don't mind troubleshooting quirky auto-mode cycling behavior yourself

What users love

Skip this if...

  • You want an intuitive out-of-box experience without hunting for third-party tutorials
  • You've had reliability issues with other T-series Honeywell stats or want to avoid service callbacks
  • You just want simple manual on/off control without complex scheduling logic

What users complain about

Compare in seconds

Based on user comments

Best choice
1Mid
Honeywell Home T9
Helpful installation videosRoom sensor priority switchingHome automation integrationSensor pairing failuresNo Apple HomeKit supportHardware and display defects
Honeywell Home T9
Helpful installation videos
Room sensor priority switching
Home automation integration
Sensor pairing failures
No Apple HomeKit support
Hardware and display defects
2Mid
Honeywell RTH8580WF
Fixable Connector IssuesCommunity Setup Guidance HelpfulAdjustable Temperature GraphsFrequent WiFi Connection Lost ErrorsLoose Internal HardwareConfusing Initial Setup
Honeywell RTH8580WF
Fixable Connector Issues
Community Setup Guidance Helpful
Adjustable Temperature Graphs
Frequent WiFi Connection Lost Errors
Loose Internal Hardware
Confusing Initial Setup
3Budget
Sonoff TRVZB
Strong Home Assistant / Zigbee integrationAffordable price and valueQuiet operation for some usersOnly on/off valve control, no position modulationNoise complaints from many unitsNo external sensor pairing or temperature offset
Sonoff TRVZB
Strong Home Assistant / Zigbee integration
Affordable price and value
Quiet operation for some users
Only on/off valve control, no position modulation
Noise complaints from many units
No external sensor pairing or temperature offset
4Mid
Honeywell RTH9585WF
Easy DIY installation with video guidanceGood value at discount pricingConvenient WiFi and app controlConfusing wiring for non-standard setupsC-wire dependency causes installation headachesFan won't shut off properly
Honeywell RTH9585WF
Easy DIY installation with video guidance
Good value at discount pricing
Convenient WiFi and app control
Confusing wiring for non-standard setups
C-wire dependency causes installation headaches
Fan won't shut off properly
5Mid
Honeywell Lyric T5
Straightforward Wi-Fi thermostat installationApp-based remote temperature controlAutomatic heat/cool changeover availableDifficulty setting up Wi-Fi and finding CRC codeInconsistent HVAC controlWi-Fi connectivity and 'offline' issues
Honeywell Lyric T5
Straightforward Wi-Fi thermostat installation
App-based remote temperature control
Automatic heat/cool changeover available
Difficulty setting up Wi-Fi and finding CRC code
Inconsistent HVAC control
Wi-Fi connectivity and 'offline' issues
6
Honeywell RTH6580WF
Factory reset recovers stuck unitsHelps catch tampering or misconfigurationSimple once configured correctlyLockout and other settings hard to locateConfusing system-type configurationWi-Fi and screen reliability issues
Honeywell RTH6580WF
Factory reset recovers stuck units
Helps catch tampering or misconfiguration
Simple once configured correctly
Lockout and other settings hard to locate
Confusing system-type configuration
Wi-Fi and screen reliability issues
7Mid
Honeywell Home T4 Pro
Effective once properly configuredAdjustable via ISU advanced settings7-day programmable schedulingConfusing setup and poor manualCycling and fan running issuesTemperature control and sensor problems
Honeywell Home T4 Pro
Effective once properly configured
Adjustable via ISU advanced settings
7-day programmable scheduling
Confusing setup and poor manual
Cycling and fan running issues
Temperature control and sensor problems
8Premium
Google Nest Learning Thermostat
Easy InstallationGood Value with DiscountsAttractive, Well-Built DesignWiring and Compatibility ConfusionUnreliable Software and SchedulingDiscontinued Support for Older Generations
Google Nest Learning Thermostat
Easy Installation
Good Value with Discounts
Attractive, Well-Built Design
Wiring and Compatibility Confusion
Unreliable Software and Scheduling
Discontinued Support for Older Generations
9Budget
Sonoff TRV
Affordable priceEasy Home Assistant/Zigbee integrationAdaptive mode improves quiet operation and efficiencyOn/off-only valve controlMotor noise during operationConnectivity and pairing issues
Sonoff TRV
Affordable price
Easy Home Assistant/Zigbee integration
Adaptive mode improves quiet operation and efficiency
On/off-only valve control
Motor noise during operation
Connectivity and pairing issues
10Mid
Honeywell Home T3
Helpful once understoodFlexible scheduling conceptReset resolves some display/mode glitchesConfusing wiring for heat pump/aux systemsConfusing programming/schedule logicShort-cycling behavior
Honeywell Home T3
Helpful once understood
Flexible scheduling concept
Reset resolves some display/mode glitches
Confusing wiring for heat pump/aux systems
Confusing programming/schedule logic
Short-cycling behavior
You are here
12Mid
Honeywell Home T4
Advanced ISU settings unlock hidden functionalityHelped many after installer or previous owner left it misconfiguredManual override and reset possibleConfusing setup and poor manualErratic temperature behavior and short-cyclingAC or heat not reaching set temperature
Honeywell Home T4
Advanced ISU settings unlock hidden functionality
Helped many after installer or previous owner left it misconfigured
Manual override and reset possible
Confusing setup and poor manual
Erratic temperature behavior and short-cycling
AC or heat not reaching set temperature

Who wins on what

Ranked by what users actually praise

Overall Impression

Setup is the single biggest pain point reported by users. Numerous commenters, including several elderly users and even professional installers and HVAC technicians, describe the included manual as confusing, incomplete, or written only for professionals. Many say they turned to third-party video tutorials because the official instructions omitted key ISU parameters or factory reset steps. Some installers reportedly gave incorrect information about override capabilities, suggesting even trained techs struggle with this thermostat's non-intuitive menu system.

Temperature control behavior confuses and frustrates many owners. Multiple users report the thermostat short-cycling, failing to reach set temperatures, or drifting to unexpected numbers like 83 or 91 degrees without explanation. Others describe the AC or heat running continuously without shutting off, or shutting off prematurely a few degrees from target. Some resolved issues via adaptive recovery or scheduling settings buried in advanced menus, but many were left with ongoing frustration and no clear fix.

When properly configured, some users see genuine benefits. One long-term user described the optimum start and stop features as AI-driven and noted noticeable gas savings compared to a previous mechanical thermostat. Others successfully used advanced ISU settings to enable auto heat/cool switching or fix scheduling quirks after watching tutorials. However, these positive outcomes generally required significant extra research beyond the box contents, and one HVAC company reported frequent T-series failures requiring replacement.

Outdated / Not-accurate data?