With funding from ‘Kas als Energiebron’, ChrIP and suppliers, four chrysanthemums crops have been carried outat the Delphy Improvement Centre in 2017. These crops had the following targets:• A heat use up to 475 MJ/m2.yr.• This heat must be extracted from harvesting heat (cooling).• A CO2-use of 25 kg/m2.yr.• A yearly electricity usage for lighting of 121 kWh/m2.yr.• 5% more production than professional growers.The most important means to achieve this objective are hybrid lighting, diffuse glass with 2 AR-coatings, anextra energy screen, 8 air handling units, well pumps and a heat pump. The crops are run under the name ‘ThePerfect Chrysanthemum’ (DPC). The realised use of CO2 and heat turn out to be lower than the target. Theamount of heat (cooling) harvested is much higher and the amount of lighting is almost equal to the target.It is concluded that an investment in air handling units, heat pump and source pumps, an extra screen andLED lighting makes it technically possible to grow chrysanthemums without gas, if an alternative is found fordisinfection by steaming.