A greenhouse climate control system should coordinate heating, ventilation, shading, cooling and irrigation-related inputs against agreed crop and equipment limits. Start with the operating sequence and the conditions the greenhouse must handle. A controller cannot compensate for equipment that lacks the required capacity.
Write an operating brief
List the crop and production stage, day and night operating requirements, local weather data, available utilities and proposed equipment. Identify which measurements represent the crop environment and which protect equipment. An outdoor weather station and a sensor exposed to direct sunlight inside the greenhouse answer different questions.
Record who owns each setting. Give the grower authority over approved crop recipes, while limiting changes to equipment protections and safety functions to qualified personnel. Require an export of the accepted settings at handover.
Check interactions before comparing quotations
| Operating condition | Question for the supplier |
|---|---|
| Heating with ventilation | How will humidity management avoid uncontrolled simultaneous heating and vent opening? |
| Strong wind or rain | Which vent positions are permitted, and what provides cooling when those positions are restricted? |
| Cooling equipment unavailable | Which alarm appears, who receives it, and what manual response is feasible? |
| Sensor fault | Does the controller detect an implausible or stale value, and what operating state follows? |
| Power or network loss | Which functions continue locally, and which require a person on site? |
Make acceptance tests observable
Agree a written test for each sequence. Identify the input, expected output, delay, alarm and recovery condition. Test simulated inputs on approved test equipment where possible. Moving vents or starting fans during a live crop cycle needs an agreed safety procedure.
Compare displayed readings with suitable reference instruments. Check sensor locations with the installer rather than treating a calibration certificate as proof that a sensor represents the whole growing zone. Keep test results alongside the configuration version.
What to ask for in the RFQ
Request the zone plan, sensor schedule, equipment interface list, alarm routing, user permissions, data export format and local operating instructions. State whether remote support needs an internet connection, a subscription or a separate gateway. Ask which party supplies networking, wiring and commissioning labor.
Ventilation and cooling performance depend on the building and outside conditions. The University of Florida's greenhouse design guidance explains these physical constraints; use it as background, not as a substitute for a site-specific design.
Questions buyers ask
Can one sensor control the whole greenhouse?
That depends on the zones and expected variation. Ask the designer to justify sensor coverage and validate representative locations during commissioning.
Is remote access essential?
Remote access can help with supervision. Essential crop-protection functions should have a documented operating plan for a failed connection.
Prepare the project discussion
Send the location, crop plan, zone layout and equipment schedule. Ask Chengfei Greenhouse to identify the interfaces included in its supply and the work that must be provided locally.
Further reading
University of Florida: Florida Greenhouse Design. The checklists are proposed operating and procurement tools; project limits require qualified review.