10–30% reduction in summer cooling costs is typical for commercial buildings. The exact savings depend on building size, insulation, and HVAC efficiency.
Yes. The small reduction in passive solar heating is far outweighed by summer savings. NJ's cooling season is longer and more energy-intensive than its heating season for most commercial buildings.
In most cases, yes. A reflective coating can be applied over existing BUR, modified bitumen, metal, or single-ply membranes without tear-off.