"U-value" . "efficiency" . . "R-24" . . . "R0" . "''R''_SI" . "R-values" . "R-40 (RSI-7)" . "U-factor" . "resistance to heat transfer" . . "resistance value" . "insulating value" . "R-value (insulation)" . "comparison" . . . "insulation" . "r-value" . "insulating R value" . "R-60 (RSI-10.6)" . "U-Value" . . "r value" . "R-value" . "insulating value." . . . . "R value" . "R-value (insulation)" . "R-value_(insulation)#U-value" . "''R''-value" . "insulating value of R-33" . "R-Value" . "R-value or RSI value" . "resistance against heat transmission" .