Quote:
Originally Posted by BigVanVader
I've found mine does NOT get colder when I leave the ends open. I am also on a slope so the cold air may flow down and away from the coldframe. Either way I keep it opened and use row cover and I still have lettuce alive after weeks in the teens.
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ah ha ....I leave my tunnel unsealed
and both ends open . I have a north/south ends configuration .. and gentle slope
to the east . I have the ability to close both ends to control air flow ..like a Carburetor. The most common thing I do is leave a strip opening on the north and south wide open then of course in prime grow season it is Max. ventilation and everything is open on both ends and even wall partial rolled etc. I still wait a bit later
for getting seedlings going so the protection will be sufficient when placed in tunnel and chances of cold damage are lessened .