[Ghost]

Hi

What time of year should I start opening the door to ventilate the Greenhouse? Should I wait till it's warmer? There's a vent in the top of the greenhouse but I can't see a way of keeping it open (The greenhouse was at the house when we brought it). I've just seen an Auto vent opener though so might invest in one.

Thanks

[DD.]

Whenever it gets too warm for whatever you've got in there.

Had mine open yesterday afternoon.

[Ghost]

Not sure how you're supposed to know if it's too warm. I currently have Spring onions and Lettuce in there.

[DD.]

They won't want it too hot. Mid sixties max will do nicely. (^oF, not ^oC)!

[Ghost]

Thanks

[Kristen]

Opening the door will create a draught, and if its much colder outside the greenhouse than in that may stress the plants.

If you can get away with Convection (throw the vents open, but not the door) I think that would be better.

But if the temperature is heading for 70F / 20C then more important to control temperature than worry about draught - but the less you open the door, the less the draught.

[Gandan57]

An auto vent opener is an absolute must for a greenhouse.

[mumofstig]

They're only about £15 on ebay at the moment 

[DD.]

An auto vent opener is an absolute must for a greenhouse.

That's where I've been going wrong for the last 45 years then.

[Kristen]

That's where I've been going wrong for the last 45 years then.

Hehehe ... me too!

I like to open the vents wider on the side away from the wind .. and to leave a couple open a crack at night during the summer.  Hard to do with the automatic ones.

But of course if you can't be there Morning and Evening then Auto-vents are a boon.

[Paul Plots]

Whenever it gets too warm for whatever you've got in there.

Had mine open yesterday afternoon.

Snap.... or should I say "slide"?
       
                Amazing how hot they can get once the sun's out for an hour!! 

[Paul Canning]

I managed to pick up a louvre vent for my greenhouse for £6 at the local auctions so am well chuffed.

However, the main reason for watching out for one is that the greenhouse didnt come with a roof opening window at all :-/

So Im wondering if i need one at all now?

What do people think, I would think that it would be sensible to have a roof one as well as the lower louvre one as theres a better chance of fresh air passage?

I would also be planning to put an auto opener on one if not both for convenience

[Kristen]

Hot air rises

[muntjac]

i must be common then.. i just stick a 1x1inch stick in my windies about now and pull it out if its gonna be frosty.. and if i start to sweat when im in the greenhouse .i go outside and leave the door open till late afternoon 

[Paul Plots]

i must be common then.. i just stick a 1x1inch stick in my windies about now and pull it out if its gonna be frosty.. and if i start to sweat when im in the greenhouse .i go outside and leave the door open till late afternoon 

The simple life for me too. A stick works well. My dad's greenhouse (that I use as well) has side vents that can be slid out of the way altogether - useful when the summer's in full fling.

Needs not to be too much of a fuss as my 91 and 96 year old parents look after the greenhouse when I'm not there (which isn't that often  ).