The microclimate of a greenhouse is not just one number on the screen. Temperature, air humidity, substrate moisture, light and ventilation change together. If you look only at the current temperature, it is easy to miss condensation at night, overheating during the day or drying out too quickly after turning on the hood.
To get started, it’s enough to control a few basic parameters and keep a history. There is no need to immediately install a complex weather station. It is more important to understand what happens on a typical day: when the greenhouse heats up, how quickly it cools down, how the air humidity changes after watering, whether there are any communication failures among the sensors.
Temperature: see peaks and duration
One brief peak in temperature may not be as dangerous as several hours of overheating. Therefore, in GrowerHub it is useful to look not only at the maximum, but also at the duration of exceeding the operating range. If the temperature rises every day after the lights are turned on or by midday, the cause may be ventilation, shading, or too tight a planting.
The temperature sensor is placed at plant level, in the shade and not close to the wall of the greenhouse. For an elongated space, one sensor shows only part of the picture. If the zones are different, it is better to separate them in monitoring and not build a general conclusion based on one point.
Air humidity and risk of condensation
High humidity at night is often unnoticeable without a schedule. During the day, the greenhouse is ventilated and looks normal, but at night condensation appears on the surfaces. This increases the risk of disease and makes watering more difficult: the top layer may remain wet, although the root zone behaves differently.
Automation here does not always have to turn on the fan immediately. Sometimes a notification is enough: “nighttime humidity is above normal for more than two hours.” Such a signal helps to change ventilation, planting density or watering time. Ventilation is discussed in more detail in the article ventilation and exhaust.
Light and watering
Light affects evaporation. On a bright day, plants use more water and the soil sensor shows a faster drop in moisture. On a cloudy day, the old watering schedule may become redundant. Therefore, it is useful to look at light data next to watering and temperature, especially if the greenhouse is in the sun or additional lighting is used.
It is not necessary to immediately build a complex model. It is enough to note important events in the journal: changing the film, installing shading, moving plants, changing the watering schedule. Then the graphs become clearer. The article history of microclimate and graphics shows how to read such connections without overload.
Automation priorities
In a greenhouse, it is worth automating first where the cost of an error is high and the action is clear. Overheating is a good candidate for notification and ventilation. Leakage - for emergency stop. Watering - only after checking sensors and limits. But many subtle recommendations are best left in the form of hints while there is little data.
If the greenhouse grows to several zones, it is more important not to add random sensors, but to keep the structure: zone, sensors, rules, log, responsible. This approach is described in the article greenhouse automation: what to control.
Conclusion
Climate control is about monitoring connections. Temperature, humidity, light and watering should be visible on the same timeline. Then GrowerHub automation helps not only to turn on the devices, but to understand what exactly is changing in the greenhouse and what actions really improve conditions for the plants.