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in2⋅h⋅∘F/BTU\text{in}^{2}{\cdot}\text{h}{\cdot}^{\circ}\text{F/BTU}

square inch hour Fahrenheit per BTU

Areal thermal resistanceexact by definition

The square inch hour Fahrenheit per BTU is 1.222987382 × 10⁻³ m²·K/W, or exactly one 144th of a US R-value. It is the North American thermal interface unit, the imperial twin of °C·cm²/W: a grease at 0.1 °C·cm²/W is about 0.08 in²·h·°F/BTU.

1 in2⋅h⋅∘F/BTU\text{in}^{2}{\cdot}\text{h}{\cdot}^{\circ}\text{F/BTU} 0.0012229874 RSI (m2⋅K/W)\text{RSI (m}^{2}{\cdot}\text{K/W)}

One square inch hour fahrenheit per btu in every areal thermal resistance unit

1,222.99square millimeter kelvin per watt (mm²·K/W)
12.2299square centimeter Celsius per watt (cm²·°C/W)
1square inch hour Fahrenheit per BTU (in²·h·°F/BTU)this unit
0.0122299tog (tog)
0.00789024clo (clo)
0.00694444hour square foot Fahrenheit per BTU (R (h·ft²·°F/BTU))
0.00142138square meter hour Celsius per kilocalorie (m²·h·°C/kcal)
0.00122299square meter kelvin per watt (RSI (m²·K/W))
0.00122299square meter Celsius per watt (m²·°C/W)
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