Why Standard White Paint Isn't Enough: The CryoPaint Difference
White paint helps. It absorbs less sunlight than dark paint, and a white roof in summer is measurably cooler than a black one. But there is a ceiling on what regular white paint can do, and there is a ceiling on what even premium cool-roof white coatings can do. CryoPaint operates in a different category entirely. Here is the difference in numbers.
Standard white paint
Most exterior white paints reflect roughly 75 to 85% of incoming sunlight. The reflective ingredient is almost always titanium dioxide (TiO₂), with the rest of the formula optimized for spreadability, color retention, and weathering, not for cooling. Critically, standard white paint emits heat broadly across the infrared spectrum.
That broad emission is the hidden problem. Heat radiated in wavelengths outside the 8 to 13 µm atmospheric transparency window does not escape to space. It gets absorbed by water vapor and other atmospheric gases, which then radiate the heat back down. The surface ends up trading heat with the sky rather than dumping it. On a hot, sunny day, a standard white roof typically settles a few degrees above air temperature.
Premium cool-roof white coatings
Cool-roof coatings (the kind certified by the Cool Roof Rating Council) push reflectance up to roughly 85 to 90% and use TiO₂-heavy formulations engineered for higher Solar Reflective Index (SRI). They typically have broadband emissivity of 0.85 to 0.90.
That moves the needle. A premium cool-roof coating on a flat roof on a hot day usually sits within a few degrees of air temperature instead of well above it. Building energy savings on a low-rise commercial roof can be meaningful.
But the physics still caps the cooling. Broadband emission still loses a chunk of its emitted heat to the warm air column. Best-case for a premium cool-roof coating in direct sunlight is approximately air temperature. Going below air temperature is not on the menu.
CryoPaint
CryoPaint reflects 94% of sunlight (across UV, visible, and near-infrared) and has 90% 8–13 µm emissivity, meaning in the wavelengths that bypass the atmosphere, it radiates its own heat to space at 90% of the maximum rate possible. The reflectance number alone is at the top end of what is achievable with a sprayable paint. The window-tuned emissivity is what changes the category.
The result is that CryoPaint can run up to 15°F below air temperature on a flat sky-facing surface under good conditions. Even when conditions are imperfect (clouds, humidity, obstructions), the 94% reflectance floor keeps CryoPaint at or near air temperature, which is roughly where the best cool-roof products top out on their best day.
Side by side
| Property | Standard exterior white | Premium cool-roof white | CryoPaint |
|---|---|---|---|
| Solar reflectance | ~75 to 85% | ~85 to 90% | 94% |
| Infrared emission profile | Broadband | Broadband | Window-tuned (8 to 13 µm) |
| Best-case surface temp | Above air temperature | Near air temperature | Up to 15°F below air temperature |
| Active heat removal? | No | No | Yes (radiates to space) |
Where regular white paint is still fine
CryoPaint is not the right choice everywhere.
- On vertical walls with steep sky obstruction, you cannot get the radiative effect anyway, and 94% reflectance over standard white paint will not justify the price difference for most owners.
- Inside any enclosed or shaded space, optical reflectance is irrelevant. A cheap interior white paint is fine.
- On a roof under a heavy tree canopy where the sky is mostly blocked, the radiative pathway is mostly closed. Standard white paint will get you most of the benefit at lower cost.
Where CryoPaint is the only product that actually works
- Flat or low-pitch sky-facing roofs in hot, dry climates.
- Low-insulation surfaces where heat can transfer through to the paint (metal roofs, shipping containers, RV roofs, equipment enclosures, vehicle roofs).
- Anywhere "near air temperature" is not good enough and you need to actually drive surface temperature down.
What this looks like in the field
In a November late-afternoon test, a CryoPainted section of a metal roof read 71.5°F. The adjacent untreated section of old roof, in the same conditions and same orientation, read 86.4°F. That is a roughly 15°F delta on a relatively mild day. On a peak summer day in Phoenix, the delta runs higher, since CryoPaint's relative advantage grows with ambient heat and solar intensity.
Bottom line
White paint is a 1980s solution. Premium cool-roof coatings are a 2000s solution. PDRC is the current physics ceiling, and CryoPaint is the product that puts it in a paint can. If the surface is sky-facing, low-insulation, and in a hot dry climate, paint that only reflects sunlight is no longer the best you can buy.