Residential HVAC Installation Practice Exam 2025 - Free HVAC Practice Questions and Study Guide

Question: 1 / 400

If a material has an R-value of 30, what would the corresponding U-value be?

.033

The correct answer is A. If a material has an R-value of 30, the corresponding U-value can be calculated by taking the reciprocal of the R-value (1/R). In this case, the U-value would equal 1/30, which simplifies to 0.033 or 0.0333 when rounded. The U-value represents the measure of the rate of heat transfer through a material - the lower the U-value, the better the material is at insulating against heat loss or gain.

The other options are incorrect because:

- Option B (30) is the R-value given in the question, not the corresponding U-value.

- Option C (3.3) and Option D (0.03) are not the correct calculations for determining the U-value from the given R-value.

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30

3.3

0.03

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