Thermal (Behr S440-7)
Illustrative room. Screen colors vary; test a sample before you paint.
Thermal (Behr S440-7) is a very deep, neutral gray from Behr: LRV 7.4, so it reflects about 7 percent of the light that hits it.
Colors that go with Thermal
Three Behr colors picked for Thermal by this site's color math: a trim white, a quiet contrast from another family, a dark accent. Behr did not choose these pairings.
Closest match in every other brand
Each brand's closest color to Thermal, ranked by CIEDE2000 (deltaE): under 1.0 is indistinguishable, 1.0 to 2.3 very close, 2.3 to 5 noticeably different, over 5 clearly different.
| Brand | Closest color | Code | LRV | deltaE | How close |
|---|---|---|---|---|---|
| Sherwin-Williams | Tarragon | SW 9660 | 7 | 3.3 | noticeably different |
| Benjamin Moore | Amazon Green | 2136-30 | 10.2 | 1.5 | very close |
| Valspar | Deep River Green | 5010-3 | 7 | 1.3 | very close |
| PPG Paints | Mountain Pine | 1034-7 | 8 | 2.2 | very close |
Lighter and darker in Behr
The Behr gray colors nearest to Thermal (LRV 7.4 (estimated)) by LRV.
Lighter than Thermal
Darker than Thermal
Color data
| Brand | Behr |
|---|---|
| Color code | S440-7 |
| Hex | #3F5052 |
| RGB | 63, 80, 82 |
| HSL | 186°, 13%, 28% |
| LRV (light reflectance value) | 7.4 (estimated from the hex) |
| Lab L*, a*, b* | 32.7, -6.1, -3.4 |
| Undertone | Cool |
| Temperature | neutral |
| Color family | Gray |
Same paint, two kinds of light
Thermal (Behr S440-7), published as #3F5052
#2E4750
#4F5952
These swatches and the rooms above are a simulation, not a measurement. How the visualizer works
Similar shades from Behr
More from Behr
Common questions
- What is the LRV of Thermal (Behr S440-7)?
- Thermal has an LRV of 7.4 (estimated from its hex value). LRV runs from 0 (black) to 100 (pure white) and measures the share of light a surface reflects, so Thermal is a very deep color.
- What is the closest match to Thermal in another brand?
- Deep River Green (Valspar 5010-3) from Valspar, at a deltaE of 1.3 (very close).
- Is Thermal warm or cool?
- Behr lists Thermal as neutral, with a Cool undertone. Its Lab b* value is -3.4; a higher b* is warmer and yellower, a lower one cooler and bluer.
Sources: hex as published by the manufacturer, via PaintDB (CC BY 4.0); LRV is not published by Behr for this color and is estimated here from the color's own hex value. Color differences are CIEDE2000 values computed by this site from the hex values (data snapshot 2026-10-01). Color names and codes belong to their manufacturers.