Heat Transfer Coefficient Converter Thank you to unitconversion.org for this table. watt/square meter/K: watt/square meter/°C: joule/second/sq. meter/K: Btu (IT)/second/sq. foot/°F: Btu (th)/second/sq. foot/°F: Btu (IT)/hour/sq. foot/°F: Btu (th)/hour/sq. foot/°F: CHU/hour/square foot/°C: