Polycarbonate roofing is too hot in some cases, but it depends on your climate and how you use it. Polycarbonate lets light through, which makes it great for greenhouses and patios. However, this same quality can trap heat underneath. The temperature under a polycarbonate roof can get very warm on sunny days. If you live in a hot area, you may need extra cooling or shade solutions. Let’s look at what you need to know before choosing polycarbonate for your home or building.
How Hot Does Polycarbonate Get?
Polycarbonate sheets are made to let sunlight pass through. This is good for plants and outdoor spaces. But sunlight also brings heat. On a hot, sunny day, the temperature under polycarbonate can reach 120 degrees Fahrenheit or higher. This heat builds up because the material traps it underneath like a greenhouse.
Cool roofs use reflective coatings to reduce this problem. According to industry data, cool roofs can lower indoor temperatures by nearly 6 degrees Fahrenheit in buildings without air conditioning. If you add a reflective coating to polycarbonate, you can cut down on heat buildup.
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What About in Hot Climates?
Hot climates make polycarbonate even hotter. States like Florida, California, and Arizona get intense sun all year. In these places, polycarbonate roofing may not be the best choice for living spaces.
According to RubyHome (2025), light-colored shingles are better in hot climates. The same idea works for roofing materials. Lighter colors reflect heat away instead of trapping it. If you use polycarbonate in a hot area, choose clear or light-tinted sheets rather than dark ones. You can also add shade structures like pergolas or awnings to block direct sunlight.
Better Options for Hot Areas
Metal roofing is a smart choice for hot regions. Metal roofs have a lifespan of 40 to 80 years, according to RubyHome (2025). They also reflect heat well and stay cooler than polycarbonate.
Other good choices include:
- Cool roof coatings that reduce energy costs
- Standing seam metal panels
- Green roofs that use soil and plants
- Concrete or clay tiles for long-lasting protection
When Is Polycarbonate Ok?
Polycarbonate works well for some uses. It is perfect for greenhouses, skylights, and patio covers in mild climates. It is also great for sheds and storage areas where you do not spend much time. According to the National Association of Home Builders, the average U.S. roof size is 2,647 square feet. For smaller spaces like a 100-square-foot patio, polycarbonate can be fine if you add shade or ventilation.
If you live in a cooler climate and do not need air conditioning inside, polycarbonate may work. Just make sure you have good airflow underneath to let heat escape.