Heater Short Cycling After Installing Mysa

If your heater seems to turn on and off more often after installing Mysa, this is usually normal behavior — not a problem.

Why Cycling Increases With a Smart Thermostat

Older dial thermostats use relatively inaccurate temperature sensors. While they may have a 0.5°C deadband in theory, the actual temperature swing is often 3–5°C because the sensor is imprecise. This leads to fewer on/off cycles, but your room temperature fluctuates significantly.

Mysa uses a much more accurate digital temperature sensor. With the same 0.5°C deadband, Mysa may cycle more frequently because it is actually maintaining your setpoint — not allowing the room to swing several degrees in either direction.

The result: More cycles, but more consistent comfort and fewer cold or hot spots between cycles.

Note If your old thermostat rarely turned on and off, it likely was not maintaining temperature well — it was just inaccurate.

When Cycling Is Actually a Problem

Contact support if you experience any of the following:

• The room never reaches the setpoint
• Energy bills are dramatically higher than expected for your room size
• The heater runs constantly without shutting off

Common Causes of Abnormal Cycling

Wrong Heater Type Setting

Verify that your heater type is correctly configured in the Mysa app.

What to do:

1. Open the Mysa app and select the thermostat.
2. Go to Settings > Heater Type.
3. Select the correct type:

• Baseboard — Proportional control for standard baseboard heaters (most common).
• Fan-forced — Proportional control with adjustable cycle timing for convection heaters.
• Radiant — On/off control for radiant panels (turns on 0.5°C below setpoint).

Tip If you want to reduce cycling frequency, try Radiant mode. It uses simple on/off control (turning on 0.5°C below setpoint) instead of proportional control, resulting in fewer but longer heating cycles.

Higher Energy Bills After Installation

More frequent cycling by itself does not increase energy usage — the heater outputs the same total heat whether it runs in many short bursts or fewer long runs.

However, your bills may increase for a different reason: your old dial thermostat was inaccurate. For example, if you set it to 21°C, your room may have actually averaged 18–19°C. With Mysa, setting 21°C means you are actually getting 21°C — and maintaining a higher true temperature requires more energy.

Note Comparing energy bills month-to-month or even year-to-year is not reliable without weather normalization. For example, January is typically colder than December, so higher January bills do not necessarily mean your thermostat is using more energy — it may simply be colder outside.

To reduce costs:

• Lower your setpoint by 1–2°C.
• Use Away mode when you are out.
• Set up schedules to reduce heating overnight or when rooms are not in use.

Get Support

If abnormal cycling continues after checking your heater type and settings, contact support@getmysa.com. Include:

• A description of the cycling pattern (how often it turns on/off).
• Your heater type and approximate room size.
• Recent changes to your installation or settings.