Greenhouse condensation

we live in a frost pocket in Oxfordshire and get frosts as late as June. This year in an attempt to keep all my outdoor planrs, I bubble wrapped the entire greenhouse. This proved successful as it kept the unheated greenhouse at 5C when the outside dropped below 0c (last night). However I am concerned about the condensation.
Bearing in mind that I cannot afford to heat the greenhouse, and opening the windows wouls seem to defeat the object of keeping any heat in, is there any remedy for this condensation?

 

Hi peedee7 and welcome.
I have just finished bubble-wrapping our greenhouse today. However, it is important to cut out holes for the roof vents and then tape a separate piece over them so that they can open on sunny days to allow air circulation as it can get very hot if it's sunny, causing condensation. I just lift up the bubblewrap to allow the side louvres to be opened. Good luck.

 

Make sure the bubblewrap is airtight at all joints.. if the warm moist interior air has any path to the cooler surfaces of the glazing/frame you will get condensation.

In the perfect case you will get condensation on the inside surface (greenhouse side) of the bubblewrap as it will still be somewhat cooler than the air temperature.

Consider that in the process of fitting bubblewrap you effectively reduce the number of airleaks in the greenhouse and i suspect that is the main reason for any noticable improvement in performance..not so much the "insulation value"

 

With mine I think that the condensation was worst at the start when the plants and their compost were still pretty wet. I think it comes during the day when the sun heats the inside up a lot. It is essentially drying out the contents. The only thing to do is to leave the door or vents open. They don't need to be open at night when its cold.