I don’t mean to be argumentative but my Father worked in heating and air conditioning at Eglin AFB for just about 40 years.
A lot of that time was spent at the climatic laboratory.
He installed the AC/Heating in our house when I was younger. He used no tape at all. We (my brothers and I) helped him install the duct work. He is the one who told me not to use duck tape on anything which was going to be subjected to any stress, wear or the elements and certainly not for long term use.
The phrase “duck tape” goes back way the hell before there was any air conditioning ducts. There was a duck tape story in Invention and Technology magazine twenty odd years ago about the development of the MOISTURE RESISTANT tape for sealing ammunition and other boxes going overseas. IIRC, the story had the contract numbers of the original order to Johnson and Johnson for production. It had absolutely nothing whatever to do with HVAC ; the duct tape name did not come along until the 50s.