{"items": [{"author": "Danner", "source_link": "https://www.facebook.com/jefftk/posts/923042323662?comment_id=923343500102", "anchor": "fb-923343500102", "service": "fb", "text": "I think your footnotes are off? two [1] and a [3], but no [2] or [4]?", "timestamp": "1517010334"}, {"author": "Jeff Kaufman", "source_link": "https://www.facebook.com/jefftk/posts/923042323662?comment_id=923343500102&reply_comment_id=923343764572", "anchor": "fb-923343500102_923343764572", "service": "fb", "text": "→ fixed!", "timestamp": "1517010397"}, {"author": "Michael", "source_link": "https://www.facebook.com/jefftk/posts/923042323662?comment_id=923456284082", "anchor": "fb-923456284082", "service": "fb", "text": "Since one of the changes was to expand the livable area of the house, which coincided with (though may not have caused) an uptick in costs, I'm surprised that you don't have a column for heating cost/sq. foot as well. Very interesting material as-is, though.", "timestamp": "1517029810"}, {"author": "Jeff Kaufman", "source_link": "https://www.facebook.com/jefftk/posts/923042323662?comment_id=923456284082&reply_comment_id=923611228572", "anchor": "fb-923456284082_923611228572", "service": "fb", "text": "→ Michael: I wouldn't expect things to scale with floor area though, more like scaling with house surface area. And that's much harder to calculate.", "timestamp": "1517056101"}, {"author": "Michael", "source_link": "https://www.facebook.com/jefftk/posts/923042323662?comment_id=923456284082&reply_comment_id=923622001982", "anchor": "fb-923456284082_923622001982", "service": "fb", "text": "→ And because window insulative quality is much lower than wall insulative quality, it's really important to factor in window surface area, not just total house exterior surface area. A U-factor of .25 is a good window, it's equal to R-4. A wall is now insulated to R-20.", "timestamp": "1517058059"}, {"author": "Michael", "source_link": "https://www.facebook.com/jefftk/posts/923042323662?comment_id=923456284082&reply_comment_id=923676363042", "anchor": "fb-923456284082_923676363042", "service": "fb", "text": "→ Jeff Kaufman I was thinking that you were overlooking an important end result -- cost for heat per person, for which \"per livable square foot\" is both a proxy and interesting in itself.
If, as you did, you expanded the usable portion of the house sufficiently to allow additional people to live there, the cost per person goes down, even though the cost per year goes up. I would think that this would be an important end result for you?
I'm also thinking of \"livable square foot\" as a proxy for \"volume enclosed\" -- dormers convert unused, but possibly heated, space into useful and heated space. You could calculate a more accurate volume by looking at the footage of the change in roofline, and the ceiling height, but I don't think that that would be more useful, just more work.
Another \"change event\" that you haven't called out specifically is when additional people moved in, and if the attic was previously unlived in and became lived in after the dormers were added, presumably that would correspond to an increase in heated area above and beyond the space occupied by the new dormers? Was the attic previously partially sealed off (i.e. by a door) and unused except for storage?
I'm looking at improving my own heating system, so I'm very interested in your methodology and will attempt to copy it in evaluating the success or failure of my own changes. I'll be adding local networked control to currently unregulated radiators, which should cut down on overheating and under-heating problems and also save fuel.", "timestamp": "1517070648"}, {"author": "Jeff Kaufman", "source_link": "https://www.facebook.com/jefftk/posts/923042323662?comment_id=923456284082&reply_comment_id=923706437772", "anchor": "fb-923456284082_923706437772", "service": "fb", "text": "→ Michael the dormer post shows the changes layout changes: https://www.jefftk.com/p/adding-dormers-to-our-house
There wasn't unheated attic, but there was some amount of unconditioned uninsulated low eave space that we converted to dormer space.
There wasn't an attic accessible before, but after putting in the dormers and foaming the inside of the roof I made the (now conditioned) attic space available through a trap door.", "timestamp": "1517079333"}]}