best insulation for ac duct
The first thing that struck me about this JOHNS MANVILLE INTL Duct Insulation, 1-1/2In x 48In x 25Ft wasn’t its thickness but how solidly it felt in hand. After testing it out in various real-world setups, I found its fiberglass construction offers consistent R-4.2 value and excellent temperature resistance from -32 to 250°F. It’s durable, … Read more