I have a thermometer on the wall in the basement and noticed the temp of the room would be a couple degrees higher on average after I was done installing the sub floor.
I would think having that trapped air pocket between the cement and the wood is similar to how a double paned window works (other than the window being filed with a gas other than regular air).
The wood floor can't transfer heat as quickly as cement either, which is why it should feel warmer than just standing on the cement directly.
Plus the Delta-FL is acting like a vapor barrier which is never a bad thing to have in a finished basement.
What is not debatable is how much better the wood floor feels than standing on cement.
I'm also hopeful that I'll get a fuller bass response with this sub floor in place vs just having a carpeted cement floor.
