"pronoun" wrote in message
...
Hi Amber,

You may consider building a bubble wrap dome inside the greenhouse. I
used
this to good effect last winter in a large DIY propagator with heating
cables controlled by a lighting dimmer switch. If this is feasable, try
to
arrange the roof, such that the condensation drips back into the soil
(sand
in my case.) This is by far the most economic method I know.

so the heated cables method won't end up with the bottom warm and the top
too cold?