Help to built external room

[tarta4ever]

Hi guys, I ve a place in my garden that seems useful to grew my pp for a couple of years, it measures are 130x180x80h, but I have to make some changes for example the hole for aeration, my fear is that the cold air could enter in the box and causes problems.what should I do?
Thanks

 

[Yvonne G]

We use some sort of flexible covering over the door to keep cold air out and warm air in. I use a vinyl strip door. Put "vinyl strip door" in the search engine on Google and it comes back with many places where you can buy it. I think you can also buy it at home improvement stores.

You have to insulate the box too.

 

[tarta4ever]

Thanks for the advice but I've changed idea, I'm going to build a bigger internal cage so I can control it in more precise way.