Mermaid Sea vs Thermal Spring
Where Mermaid Sea belongs to Behr's range, Thermal Spring is a Sherwin-Williams color. Both sit in the blue family, which is useful context if you're narrowing within a single hue direction. Thermal Spring (LRV 21) reflects noticeably more light than Mermaid Sea (LRV 13), a difference of 8 points that becomes especially apparent in rooms with limited natural light. Mermaid Sea runs green and blue while Thermal Spring is decidedly cool, which means they'll respond very differently to warm vs cool light sources. The ΔE 6.7 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.
Color Details
Mermaid Sea vs Thermal Spring Simulated Comparison
5 simulated room previews — drag the slider on each to see Mermaid Sea on one side and Thermal Spring on the other.
Digital color is approximate. These simulations are generated from the manufacturer's hex values and overlaid on grayscale room photos — your screen's calibration, brightness, and viewing angle all affect how they render. Before committing to either color, test physical samples in your own space under the light you actually live with.
More Mermaid Sea comparisons
See how Mermaid Sea stacks up against other well-photographed colors across different brands and tones.
