What does summer mean to you? It may be perhaps the sound of (hopefully) distant lawnmowers, the sight of butterflies darting in the air or bees, industrious and efficient, or maybe the opportunity to sink a few beers and have a barbecue. Whatever the pleasures a sunny day can provide; for gardeners, however, beautiful weather can have a downside. For keen gardeners the greenhouse is an important part of their life, whether they use it for bringing on seedlings, growing exotic plants and hot house vegetables and fruits or just getting a bit of peace and quiet, and for all these things temperature is vital. The easiest way to control the temperature in a greenhouse is simply to open or close the window, but this obvious solution can be more difficult than might first appear for the simple reason that no one may be there to do it. The answer Read more…