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Keep a Home Assistant heating automation in a stable comfort range by controlling it with the temperature in the occupied part of the room, not the thermostat’s requested setpoint or a sensor beside the radiator. Give the controller separate cold and hot tolerances (hysteresis), require a low temperature to persist before starting heat, and enforce minimum-on, maximum-on, and cooldown times. These safeguards absorb sensor noise and heater thermal lag while placing a hard limit on a stuck-on cycle. Tune the values from several logged heating cycles, then adjust each room independently because sunlight, insulation, radiator size, and occupancy differ.
Why does a Home Assistant heating automation overshoot the target?
Overshoot usually comes from a combination of measurement error, a control band that is too narrow, and heat that continues arriving after the switch turns off. A thermostat can stop calling for heat while a hot radiator, pipe, or heater body is still releasing energy. If the sensor is already warm because it is above the radiator or in sunlight, the controller may also make the wrong decision for the part of the room people occupy.
The controlling sensor is in the wrong place
Use a sensor at representative breathing height in the occupied area. Keep it away from the radiator, direct sunlight, exterior drafts, televisions, computers, and warm hallways. A sensor that reads artificially high can satisfy the target while the sofa, desk, or bed remains cold; a sensor in a cold draft can run the heater long after the rest of the room is comfortable.
Thermal lag hides the result of a switch action
Radiators and other heaters do not change room temperature instantly. The room can continue warming after the relay opens, so an exact-temperature rule tends to overshoot. A bounded cycle and a deadband let the room settle before another decision is made.
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What is the difference between a thermostat setpoint and room temperature?
The setpoint is the temperature someone requested; the measured room temperature is what the sensor currently reports. Home Assistant’s target-temperature-changed trigger watches the requested setpoint, so it is appropriate when a user changes the desired temperature, but it cannot tell you whether the room is cold. Use a measured-temperature trigger for comfort decisions.
Climate entities expose two related states. The requested HVAC mode can be off, heat, cool, or another supported mode, while the current HVAC action can be heating or idle. Around the target, hysteresis creates an intentional ambiguous range; Home Assistant’s developer guidance notes that an integration may not be able to determine whether a variable-power device is still heating or effectively idle. Do not treat an idle report near the band as proof that every warm surface has already cooled.
How should I choose the sensor that controls a radiator?
Choose the sensor that best represents the room’s occupied zone, then validate it against a second thermometer during several cycles. The radiator’s own measurement is often biased because it is close to the heat source.
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- Place the sensor at roughly breathing height where people spend time.
- Avoid mounting it directly over or beside a radiator, in a sun patch, above electronics, or in a draft from a door or window.
- Check that Home Assistant reports the expected temperature unit and a useful precision; excessive rounding can make a narrow band chatter.
- For a room with large temperature gradients, use a room-level remote sensor or valve rather than assuming one wall measurement represents the whole space.
A thermostatic radiator valve (TRV) can measure near its own radiator unless it supports an external room sensor. The SONOFF TRVZB, for example, exposes an external-temperature input and open-window detection; Zigbee2MQTT lists local temperature, running state, frost protection, and smart temperature controls. Configure the external sensor when the valve’s local reading is not representative.
What deadband settings stop rapid heater cycling?
Use two thresholds instead of one equality test. Home Assistant’s Generic Thermostat uses cold_tolerance to decide how far below the target the measured temperature must fall before heating starts, and hot_tolerance to decide how far above the target it must rise before heating stops. This hysteresis prevents a relay from switching every time a reading fluctuates around one value.
The Generic Thermostat documentation gives default cold and hot tolerances of 0.3 in the configured temperature unit. Treat that as a starting behavior, not a universal setting: a radiator with long lag may need a wider band, while a fast heater and a stable sensor may work with less. Increase the band when logs show repeated short cycles; narrow it only after the room remains comfortable and the sensor is trustworthy.
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Use a two-sided comfort band
Define the comfort range explicitly. For a 20–22 °C band, turn heating off when the measured room temperature enters that range, and start it only after the lower threshold has been crossed by the chosen cold tolerance. This is more stable than trying to hold one exact number.
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How do minimum, maximum, and cooldown times protect the heater?
Deadband handles temperature noise, while time limits handle equipment behavior. Generic Thermostat provides three independent protections:
| Control | What it limits | Documented example |
|---|---|---|
min_cycle_duration |
Prevents a newly started heater from stopping immediately, reducing short cycling. | One minute |
max_cycle_duration |
Bounds a continuous on-cycle if the sensor, automation, or heater fails to reach the target. | Ten minutes |
cycle_cooldown |
Blocks immediate reactivation after a cycle ends, allowing residual heat to dissipate. | 30 seconds |
Those durations are examples from the documentation, not prescriptions. Set the maximum shorter than the time that could make the room unsafe or uncomfortably hot, taking the heater’s output and the room’s thermal lag into account. A maximum-on bound is a safety limit, not a substitute for a working sensor, a correctly wired switch, or an independent hardware cutoff.
Generic Thermostat prerequisites
Generic Thermostat combines one temperature sensor with one switch-controlled heater. Before configuring it, confirm that the switch really removes heat when turned off and that the sensor updates while the automation is running. A stale or unavailable sensor should trigger an alert and a safe operating policy rather than silently extending a heating cycle.
Illustrative configuration
The following example shows the documented option names and example durations. Replace the entity IDs with the actual sensor and switch in your installation, and tune the temperatures and times from logged behavior.
climate:
- platform: generic_thermostat
name: Living room
heater: switch.living_room_heater
target_sensor: sensor.living_room_temperature
cold_tolerance: 0.3
hot_tolerance: 0.3
min_cycle_duration:
seconds: 60
max_cycle_duration:
minutes: 10
cycle_cooldown:
seconds: 30The tolerance values use the temperature unit configured for that entity. Do not assume that a number copied from a Celsius installation has the same practical meaning in a Fahrenheit installation.
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How do I require a temperature threshold to persist?
Use a temperature-crossed-threshold trigger with a “for at least” duration. For example, require the room to remain below 18 °C for five minutes before starting heat. Home Assistant’s temperature trigger guidance specifically recommends this delay to reject brief dips caused by opening a door or window.
- Select the measured room-temperature sensor as the trigger entity.
- Set the below-threshold condition to the cold boundary used by your comfort band.
- Add a “for at least” duration long enough to ignore a short draft but short enough to respond before occupants notice sustained cold.
- Add a separate in-range or above-threshold trigger to turn heating off when the room reaches the defined comfort range.
- Keep the heater’s cycle protections enabled; a persistence delay does not replace a maximum-on limit.
Use the setpoint-change trigger separately when the goal is to react to someone changing the requested temperature, such as recalculating an occupied schedule. Do not use that trigger as evidence that the room has warmed.
How do I tune a heating automation without guessing?
Change one control at a time and observe several complete cycles. A practical sequence is:
- Log both signals. Record the room sensor and heater state with timestamps. Include a start, the switch-off point, the highest temperature reached afterward, and the next restart.
- Validate the measurement. Check location, unit, update frequency, and precision. Compare the reading with a reliable thermometer in the occupied zone.
- Start with a modest deadband. Use separate cold and hot tolerances. If the relay chatters, widen the band before changing unrelated automations.
- Add a short minimum cycle. This prevents a tiny fluctuation from stopping a heater immediately after startup.
- Set a conservative maximum cycle. Choose a bound that cannot leave the room dangerously hot if a sensor or network condition goes wrong.
- Add cooldown. Prevent a just-stopped heater from restarting while residual heat is still entering the room.
- Add persistence and shutoff triggers. Require the low threshold to last several minutes, and switch off when the room enters the comfort range.
- Repeat per room. Do not copy one room’s values blindly to another; heat gains, insulation, radiator output, and occupancy change the response.
Why is one room cold while another overheats?
A single thermostat or sensor can regulate only the zone it measures. Rooms with different sun exposure, insulation, radiator sizes, door positions, or occupancy can diverge even when they share one target.
Use room-level control when heat gains differ
Give each important room its own representative sensor and control channel. Room-level valves or remote sensors let a bedroom, office, and living room respond to their actual conditions instead of forcing every space to follow a hallway thermostat.
Account for radiator-local measurements
A TRV mounted on a radiator often senses a warmer pocket than the rest of the room. External-temperature support is therefore a meaningful comparison point when selecting hardware. The SONOFF TRVZB is a Zigbee thermostatic radiator valve with schedules, open-window shutoff, external temperature sensing, Home Assistant support, and M30 x 1.5 compatibility; verify the valve thread and your Zigbee coordinator before purchase.
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Which hardware path fits a multi-room setup?
Compare the control location, sensing method, protocol, and safety behavior rather than choosing by the thermostat label alone.
| Approach | Measurement and granularity | Notable functions | Infrastructure or fit checks |
|---|---|---|---|
| Generic Thermostat | One room sensor paired with one switch-controlled heater. | Cold and hot tolerances, minimum and maximum cycle durations, cooldown. | Requires a Home Assistant temperature sensor and a switch entity that controls the heater. |
| SONOFF TRVZB | Radiator valve with optional external room-temperature input; room-level control. | Zigbee 3.0, schedules, open-window shutoff, frost protection and smart temperature controls exposed through Zigbee2MQTT. | Confirm M30 x 1.5 compatibility, the external-sensor setup, and a compatible Zigbee coordinator or hub. |
| Danfoss Ally Room Sensor | Dedicated room temperature and humidity measurement over Zigbee. | Provides a remote measurement for a compatible radiator-control design. | Requires a compatible Zigbee coordinator or hub and an integration path to Home Assistant. |
| Danfoss Ally radiator thermostat | Radiator-level control with its own valve sensing. | PID-accurate control, adaptive learning, open-window function, and frost protection. | Check radiator fit, Zigbee infrastructure, and whether an external room sensor is needed. |
Any Zigbee valve or sensor requires a compatible coordinator or hub. Confirm that the coordinator, integration, and device entity types are supported before buying; a valve that cannot join your network cannot provide useful room control.
What should happen when a sensor or network becomes unavailable?
Design the failure behavior explicitly. A missing temperature update is not the same as a cold reading. Treat an unavailable or stale sensor as a fault, notify yourself, and ensure the heater cannot remain on indefinitely; the maximum cycle is the last-resort bound, not the whole safety plan.
- Alert when the controlling sensor becomes unavailable or stops updating.
- Alert when the heater switch state does not match the command.
- Keep a maximum-on duration shorter than the time that could overheat the room.
- After a network or coordinator outage, verify actual valve and heater states instead of trusting a cached dashboard value.
- For rooms at frost risk, use the equipment’s documented frost-protection behavior and a separate monitored policy rather than disabling all safeguards.
How can I diagnose overshoot, chatter, or a cold room?
Match the symptom to the signal and timing in your history.
| Observed symptom | Likely cause | Targeted correction |
|---|---|---|
| Temperature rises well above target after shutoff. | Sensor is too close to heat, the deadband is too narrow, or the heater has substantial thermal lag. | Relocate or externalize the sensor, widen the hot tolerance, and add or lengthen cooldown. |
| Relay turns on and off repeatedly. | No hysteresis, excessive sensor rounding, or no minimum cycle. | Use separate tolerances, verify precision, and set a minimum cycle duration. |
| Heater runs continuously. | Sensor is too cold or unavailable, the heater cannot meet the load, or no maximum cycle is configured. | Check sensor placement and availability, verify heater output, and enforce a maximum-on duration. |
| One side of a room is cold. | The control sensor represents a warmer area, often near the radiator or sunlight. | Move the sensor to the occupied zone or add a remote room sensor. |
| Automation starts when someone changes the target but the room is not cold. | A setpoint-change trigger was used for comfort control. | Trigger heating from measured temperature; reserve setpoint triggers for user-request changes. |
Dashboard shows idle while surfaces still feel warm. |
Residual heat and the integration’s hysteresis make current action ambiguous near the target. | Use measured temperature and heater state history, not the action label alone, to judge the cycle. |
What settings should I review after moving a sensor?
Moving a sensor changes the controlled variable, so revisit the entire loop rather than keeping old timings automatically. Confirm the new reading against the occupied area, watch one complete warm-up and cool-down period, and then retune tolerance, persistence, and cooldown in that order. A room that previously appeared to heat quickly may reveal a longer real warm-up once the sensor is no longer beside the radiator.
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Open-window shutoff and frost protection are equipment-level safeguards that complement, rather than replace, Home Assistant hysteresis and cycle limits. A TRV may stop heating when it detects a sudden temperature drop from an open window, while frost protection can maintain a low protective temperature. Verify how those states are exposed by your integration and decide which system has authority when an automation also requests heat.
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What is the reliable design pattern?
Use the occupied-room sensor as the control signal, a two-sided comfort band for hysteresis, a persistence delay for brief disturbances, and cycle timing that matches the heater’s lag. Separate rooms when their conditions differ, verify Zigbee infrastructure for valves and sensors, and monitor failures so an unavailable sensor cannot become an unnoticed continuous-heat command.
Frequently Asked Questions
Can I use the thermostat’s setpoint as the room-temperature sensor?
No. The setpoint is only the requested temperature and can remain unchanged while the room warms, cools, or becomes unoccupied. Keep a measured temperature entity as the control input and use setpoint events only for actions caused by a user changing the request.
Why does a radiator feel hot after Home Assistant turns it off?
Water, metal, and nearby surfaces retain heat and continue releasing it after the switch or valve closes. Log the room temperature after shutoff and use cooldown and hot tolerance to prevent an immediate restart while that residual heat is dissipating.
Can Zigbee radiator valves work without a coordinator?
They need a compatible Zigbee coordinator or hub to join the network and expose their controls to Home Assistant. Check the coordinator and integration path before purchasing a valve or room sensor.
How long should I wait before changing the tolerances again?
Wait through several complete heating cycles that include startup, shutoff, post-shutoff warming, and the next restart. There is no universal waiting interval because heater output, insulation, and sensor placement determine how quickly a change becomes visible.
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