BUT also can build one long geothermal tunnel/vent system that helps cool air for all. Below ground the air balances to a constant temp and it can help cool during day and desert does sometimes get really cold at night too, but below ground stays more stable.
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How to Keep Your Shipping Container Home Cool
As with a metal shed, a bare shipping container home can quickly heat up and stay hot during the summer months. Luckily, you can make your container home cooler and more energy efficient with the following steps:
Choose the right insulation
Install heat-resistant roofing
Optimize the ventilation systems
The insulating value of a product is listed as the R-value per inch:
Batting (standard rolls of blanket insulation) 3.1 to 3.4
Blown-in fiberglass insulation 3.7 to 4.3
Blown-in mineral wool 3.1 to 4.0
Blown-in cellulose 3.2 to 3.9
Rigid insulation boards 3.8 to 6.5
Open-cell spray foam 3.5 to 3.6
Closed-cell spray foam 6.0 to 6.5
Closed-cell spray foam offers the most insulation per inch. Unlike blown-in insulation, it also maintains coverage. Blown-in insulation tends to settle in wall cavities, keeping it from insulating the upper portions of the walls after several years. Rigid boards or rolls of insulation are often used under the roof.
Install Heat-Resistant Roofing to Reflect Heat
Some of the latest metal roofing products can reflect over 70% of the suns rays. The typical asphalt roof only reflects about 30% of solar rays. Reflecting more heat helps cut energy costs and increases the lifespan of your roof.

Optimize Ventilation Systems to Improve Airflow
Keeping your container home cool depends on the airflow inside your home. The placement of vents, windows, and doors should be optimized to avoid blocking the flow of air.
Allowing air from the vents to pass through the home unrestricted makes it easier to cool during the summer and heat during the winter.
You may also want to consider installing energy-efficient appliances. For example, choosing a multi-stage air conditioner unit instead of a single-stage AC unit allows it to run at lower speeds and gradually cool your home instead of constantly running at full speed.