According to the DOE, the minimum R-value for a ceiling in a home located in Zone 5 is what?

The correct answer reflects the U.S. Department of Energy's (DOE) recommended insulation levels for residential buildings, particularly in relation to energy efficiency. In Zone 5, which experiences colder climates, the minimum R-value for ceiling insulation should be at least 49.

This high R-value is essential for reducing heat loss in colder months, helping to maintain indoor temperatures and increase comfort. Proper insulation also contributes to energy savings by reducing the workload on heating systems, thus lowering energy bills over time.

Choosing the right insulation R-value is critical for performance. Each zone has different requirements based on climate conditions, and for Zone 5, an R-value of 49 is necessary to achieve the desired thermal resistance.