Anyone wishing to install and use a greenhouse thermostat in their glasshouse should be aware of the range of thermostats on the market. It is important to know all about the different workings of these thermostats, as they can affect how temperature in the greenhouse is controlled.
The capillary greenhouse thermostat, for example, is traditionally used by amateur gardeners, as it is easy to install and operate. Electronic thermostats are becoming more popular, as they have the ability to sense the temperature anywhere within the greenhouse, and the sensor can be placed between plants, in compost or propagators, or even suspended from the roof. This range of placements allows the greenhouse thermostat to have very accurate control.
Another important detail to remember is that all thermostats loose accuracy as they become older. It is necessary to check their accuracy once a year, at the very least. Checking the thermostat functioning is also a good time to clean the sensor, and use a cleaner to wipe down leads and connections.
Installing a Greenhouse Thermostat
When installing a greenhouse thermostat, choosing a good location is vital. Ensure that the thermostat can feel the temperature around the plants by installing a sensor at plant height. Mounting the thermostat on the walls will not give the best results. You should also ensure that the greenhouse thermostat is not too near to heating pipes, or in direct sunlight.
When choosing a thermostat, you can pick one with a range of sensors, which can then be placed throughout the greenhouse. This is probably the best way of getting an accurate reading on a greenhouse thermostat: the range of readings allow the thermostat to keep the greenhouse at optimum temperature. Place sensors in the compost of the plant, and also in the air at the height of the top growth.
The wires which connect these sensors should then be bound to supports: shelving, for example, if the sensor is in the plant soil, or to the greenhouse frame if the sensor is hanging from the roof. Put a number of ties along the length of the wire to ensure that it does not sag, and pull the sensor out of position, as this can affect the accuracy of the greenhouse thermostat.
Place the control for the thermostat onto a wall near to the front of the greenhouse, so that it can easily be altered without growing plants being damaged. Be careful not to underestimate how much room the plants will need when installing the control: it is probably best to place it as close to the door frame as possible. This control should then be linked to the heating and cooling systems as directed in the thermostat's instructions. Each design of thermostat is different, so following these instructions is essential. Screw the control securely to the wall, and ensure that it cannot be invaded by spiders and other bugs.
Put the cooling and heating systems together in the same location: putting them into a closed, vented box which has been painted white or covered in white paper will help to give more accurate readings.