Question 1

What is RSI?

Accepted Answer

RSI (m²·K/W) is the metric thermal resistance value. Higher RSI means better insulation.

Question 2

What is a clo?

Accepted Answer

A clo is a unit of clothing insulation. 1 clo = 0.155 m²·K/W, roughly equal to a business suit.

Question 3

How do you convert between R-value (imperial) and RSI (metric)?

Accepted Answer

1 RSI (m²·K/W) = 5.678 R-value (h·ft²·°F/BTU). Divide imperial R-value by 5.678 to get RSI. For example, R-19 insulation ≈ RSI 3.35.

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