Many types of buildings could benefit from duct sealing, according to a study from a Minneapolis-based environmental organization. 

Hardcast now has an e-course on duct sealing mastics.

With a passion for sealing ductwork, Mr. Hardcast knows his way around the HVAC industry. He believes in products that reduce ductwork air leakage, energy loss, and moisture intrusion.

Spectronics Corp. says it has introduced a hassle-free way to quickly and permanently seal refrigerant leaks in compressors, condensers, evaporators, O-rings and hoses with its Spectroline Cool Seal AC leak sealer.