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Our video on how to keep a polytunnel warm shows our three attempts at retaining day time heat during the night. Eventually we managed to warm our polytunnel by around 4 degrees celcius.
We compared our polytunnel temperature to the temperature of an outside thermometer in our garden. This enabled us to benchmark improvements to our polytunnel temperature by comparing the difference with our garden thermometer.
Music: YouTube audio library ‘Accidents Will Happen’ by Silent Partner.