This picture shows all three of the film covered beds. The first one nearest the camera has fabric over the film

 This is the second bed with film only.

 This is the third one with film out and fabric in

This picture looks back towards the fabric out film in bed. I have a thermometer in the fabric out film in bed and a remote sensor in the film out  fabric in bed. Sunday the 9th was a sunny day temperature of 62 degrees. The temperature in the film out fabric in bed was 92 degrees. Temperature in the fabric out film in was 82 degrees. This info so far proves what I thought would happen with the fabric. I do not have a thermometer in the film only bed. I will rectify this soon. The chard in the fabric out film in bed has pretty well healed from its foray with two days of sub freezing weather with out covers. I will see if I can harvest this week and compare quantities with another mature bed.