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Insulating feeds but not returns?

mikep7777 Member Posts: 13
Just had a new mod/con boiler installed, and the old 2"-3" pipes replaced with 3/4 copper. The basement is unheated, and in the past the (insulated) system still kept the basement warm enough (50-60's). It's pretty much just utility space, and a small shop. There is fiberglass insulation between the basement and first floor.

With the new boiler, I'm trying to figure out if it makes sense to insulate only the feeds, not the returns - the thinking is that the residual heat from the returns would keep the basement warm enough, and also lower the return temps, which should increase efficiency. Is this a dumb idea?

I'm in MA, the house has an 8' stone foundation, with the top 1.5' above-grade granite. Not sure if I should need any heat at all in the basement (especially after next week's project: repointing the foundation and replacing the windows, which should pretty much eliminate any air leakage).



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