[clkeiper]

I agree about the ventilation... $$$$$ electricity $$$$$...... you will be using to run the fans? Your fans will run all day everyday without the sides rolled up. I have 3 high tunnels with NOTHING but side ventilation and 3 greenhouses with automatic fans and continually running haf fans. One of those has a roll up side the other doesn't the third one is for starting seeds and is attached to the house. They run all the time during the Summer. The side roll up is much easier to keep the diseases down in too, because there is way more air movement than the non-roll up sided one. I also grow in mine clear into the Fall or even winter if I can. If you aren't growing in them... (which is a waste of space to not grow in them) then I understand not needing side rollups. Sometimes my electric bill runs about 400.00 during July/August/ Sept. This is just my perspective from having both and using them to earn money, too.