Most efficient way to cool down a greenhouse?

[naruto 10]

I'm building a small greenhouse in my backyard and the thing is most people build it to generally control heat and cold weather but in my case since I live in Saudi Arabia I'm not worried about the cold weather but the heat is what I need to reduce. I want to build a greenhouse that control a 50° in the summer without using an AC and a lot of electricity. I don't expect the greenhouse to cold down 25° off but a reduction of 10-15 degrees would be nice. The weather is usually dry but we get 60% humidity sometimes

 

[Kidds]

So why build a greenhouse in the first place?
Shade, reflection of sun, cooling from evaporation (but that uses water you maybe can’t spare).

 

[naruto 10]

So why build a greenhouse in the first place?
Shade, reflection of sun, cooling from evaporation (but that uses water you maybe can’t spare).

Mainly because seedlings can't handle the heat of sun and the hot air burns their leafs and yeah the birds they eat literally every seedlings I plant I can name more reasons too.
We have plenty of water so most efficient way of using the water to cold down the dry air would be what exactly?

 

[DanniAgro]

My friend sprays the water on the floor, and in evaporating it cools the air above it. This must be the simplest way to cool it.

 

[naruto 10]

Yeah I'll definitely do that

 

[solo]

Some garden greenhouses are painted on the inside with whitewash to reduce sunburn on crops like tomato. Presumably the white will also reflect heat too.

 

[Yale]

Would you be better with the plants outside and use a sun shade sail to cut the direct sun light.

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[Princess Pooper]

You can buy a screening mesh which provides a thin shade, I've seen it used to provide shade for livestock in hot countries like South Africa. Just create a frame to hang it from like a loose tent.

 

[Exfarmer]

You need more of a polytunnel with shading. You must get plenty of air flow. Misting can help, but can easily cause disease so take care. Keep the roots moist at all times

 

[Lowland1]

In Sudan we used pad and fan greenhouses water trickled through a cardboard type of screen at one end and a fan at the other. Saudi temperatures will be similar to Sudan and I would be pretty sure all is available there. We had about 10 greenhouses of about 50m long by 50 wide growing cucumbers and tomatoes.

 

[renewablejohn]

Just use solar glass and use the free electric to power the AC unit.

 

[Bogweevil]

Some garden greenhouses are painted on the inside with whitewash to reduce sunburn on crops like tomato. Presumably the white will also reflect heat too.

Best painted on outside. Some paints go translucent in wet weather.

Ordinary limewash works well enough if bone fide paint unavailable.

 

[Bogweevil]

Mainly because seedlings can't handle the heat of sun and the hot air burns their leafs and yeah the birds they eat literally every seedlings I plant I can name more reasons too.
We have plenty of water so most efficient way of using the water to cold down the dry air would be what exactly?

Lath houses often used for propagation in hot countries