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Energy efficiency is not just low-hanging fruit; it is fruit on the ground. Stephen Chu, US Secretary of Energy

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  • Because supplementary lights also produce heat, they can have a sudden impact on the temperature balance of a greenhouse when they are turned on. Get your control strategy right and the ‘waste heat’ from the lights can make a useful contribution to the heating needs of the greenhouse. Read More...
  • This article explains some set points you can use with your climate control computer to control when your greenhouse screens open and close in relation to time of day and light level..   Starting set points for your climate control computer: (Click on table to see a larger version)           Set point 1: Absolute light limit Definition: If the light level is higher than this, the screen will open regardless of how cold it is outside. Read More...
  • In our article 'Optimising screen and vent control with lights',  we explained the importance of gapping when screens are used over supplementary lights. But during spells of extreme cold weather, is it still correct for your screen to gap — and wouldn’t a fully closed screen help to save energy? Read More...
  • Click to see a larger version                   The greenhouse temperature dropped pretty quickly and the screen closed. The end result was a lower pipe temperature than before the screen closed and a warmer greenhouse. Read More...