Is It Hot to Live in a Container House?

Whether living in a container house is hot depends on its insulation treatment and air conditioning configuration. Without effective treatment, it can be extremely stuffy in hot climates. Here is a detailed analysis:

Container Houses Without Insulation Treatment Are Prone to Heat Absorption and Temperature Rise

Container houses are modified from metal shipping containers. Metals have low specific heat capacity and high thermal conductivity, allowing them to quickly absorb and transfer heat in hot climates. For example, the container dormitories at the 2026 Nagoya Asian Games faced issues in the humid and hot September weather in Nagoya. The containers absorbed heat, making the rooms very stuffy. Even with air conditioning, it was difficult to maintain a comfortable temperature due to insufficient air conditioning capacity.

Insufficient Air Conditioning Configuration Exacerbates the Stuffiness

The number and power of air conditioners directly affect indoor temperature regulation. In the container houses at the Nagoya Asian Games, each unit (shared by two households) was equipped with only one air conditioner, which had to cover two bedrooms and a living room. With the bedroom doors closed, cool air couldn't enter, making it difficult to sleep due to stuffiness; with the doors open, privacy was compromised. The organizing committee even suggested opening the doors to cool the entire room before going to bed at night and then closing them, highlighting the issue of insufficient air conditioning.

Effective Insulation Treatment Can Improve the Stuffiness Problem

By using insulation materials, installing air conditioners, and implementing proper ventilation systems, living comfort can be significantly improved. For example, residential container houses use a three-layer key structure: an outer layer of anti-corrosion color-coated steel plate to reflect sunlight, a middle layer of over 50mm polyurethane foam to block heat transfer, and an inner layer of fire-resistant gypsum board + moisture-proof film to control humidity and stabilize temperature. This structure effectively enhances insulation performance. The national 'Technical Standard for Steel Structure Integrated Houses' explicitly requires that the heat transfer coefficient of residential container walls should be ≤0.45W/(㎡·K), which is 1.8 times the insulation efficiency of traditional brick-and-mortar walls. Actual measurements show that the temperature rise inside the container is 22 minutes slower than outside at noon in summer.