Staple-up hydronic heating: air cavity or aluminium exchanger?
I’m getting ready to install the radiant tubing in the floors (staple up from the bottom to the sub floor in between the joist bays). I was planning on getting aluminium heat exchangers, as I imagine they are more efficient for heat transfer. However, I don’t like the added cost of the material and labour. I spoke with my local Upanor rep, and he mentioned that without them, I’d need to do an air cavity at the top of the floor joist bay.
Then I found this article by Big JL stating that the air cavity method (without radiant) makes for warmer floors.
Not sure what the best option is, obviously not adding aluminium is cheaper and quicker for install, but getting some conflicting information here as to what actually more efficient and I’m curious.
Does anyone have any comment or experience with this?