YielixCO2 Enrichment for Greenhouses: Costs, Benefits, and Break-Even Analysis
Test enrichment economics with measured inputs
CO₂ enrichment economics depend on enclosed volume, target and ambient concentration, operating hours, delivered CO₂ price, crop value and a stated yield-response range. The calculator compares the annual CO₂ cost with the entered value of that range; it does not predict crop response.
Measure and record the operating window and ventilation conditions. Use the Greenhouse Fan Sizing Calculator for the separate question of ventilation capacity, and use the enrichment calculator for the cost comparison.
Compare your stated CO₂ operating cost with an entered crop-value range
CO2 Enrichment ROI Calculator
Calculate CO2 enrichment annual costs, break-even yield increase requirement, and net ROI range for greenhouse operations.
Separate air replacement from crop-value assumptions
The tool calculates the mass needed to raise one entered greenhouse volume by the entered concentration difference, then applies daily hours, 365 days and price. It assumes that amount for every enrichment hour; it does not model leakage, venting, sensor control, combustion byproducts, distribution or changing crop uptake.
Yield-response percentages and crop value are inputs to a sensitivity comparison. Enter evidence appropriate to the crop, cultivar, stage and local management; do not treat an input range as a universal recommendation.
Formula and units
CO₂ per hour = volume [m³] × (target − ambient) [ppm] ÷ 1,000,000 × 1.96 kg/m³
annual CO₂ cost = CO₂ per hour × hours/day × 365 × $/kg
yield-value change = annual crop value × entered yield change / 100
break-even yield change = annual CO₂ cost ÷ annual crop value × 100
Worked example: 10,000 ft³ enrichment case
Use the live calculator’s verified fixture: 10,000 ft³, target 1,000 ppm, ambient 400 ppm, $0.50/kg, 8 h/day, a 20–30% entered response range, and $50,000/year current crop value.
- Convert volume:
10,000 ft³ × 0.0283168 = 283.168 m³. - Hourly CO₂:
283.168 × 600 ÷ 1,000,000 × 1.96 = 0.333 kg/h. - Annual cost:
0.333 × 8 × 365 × $0.50 ≈ $486.18/year. - Break-even response:
$486.18 ÷ $50,000 × 100 ≈ 0.97%.
The calculator reports positive net values for both entered response ends in this fixture. That result only says the entered value range exceeds this modelled CO₂ cost; it is not evidence that the response will occur.
Enter your greenhouse volume, concentrations, local CO₂ cost and response range
CO2 Enrichment ROI Calculator
Calculate CO2 enrichment annual costs, break-even yield increase requirement, and net ROI range for greenhouse operations.
Interpret break-even as a sensitivity threshold
Compare the break-even percentage against a documented, crop-specific response range and rerun it when price, runtime or crop value changes. A large or poorly controlled air exchange can make this fixed-volume approximation unsuitable; review monitoring and operating controls before spending on equipment. The Greenhouse ROI Calculator can use a chosen annual result as one operating-cost or revenue assumption, but it does not validate it.
Assumptions and limitations
- Entered volume, concentrations and runtime represent the enrichment operation.
- The calculation uses a fixed CO₂ density and repeats the same hourly quantity every operating day.
- It excludes ventilation, leakage, crop uptake, controls, equipment capital, safety requirements and yield biology.
Common mistakes
- Entering floor area instead of enclosed volume or mixing ft³ and m³.
- Using a concentration target without subtracting the ambient input.
- Treating a positive calculator result as a crop-response measurement.
- Leaving CO₂ price, runtime or crop value unchanged after operating conditions change.
Sources
The mass conversion and annual-cost steps above disclose this calculator’s method. Carbon-dioxide identity and reference data are available from the NIST Chemistry WebBook: carbon dioxide. Establish crop response, safety and operating controls with crop- and site-specific primary evidence.