2 ms·

Walls may be better insulated, but to accumulate a high temperature you need a source of heat. Where is the source of heat in a wall? For attics you might be on

by ajb 6y ago

Walls may be better insulated, but to accumulate a high temperature you need a source of heat. Where is the source of heat in a wall? For attics you might be on to something as heat rises. Still, 30 degrees seems a lot to me.

zxwx 6y ago
The sun is the heat source.
NeutronStar 6y ago
It's 30 degrees outside all the time. Do you expect every house ever built to have been using AC?
crooked-v 6y ago
> Where is the source of heat in a wall? The rooms around it.
- ajb 6y ago
  The claim is that the walls can be hotter than the room around it. By the second law of thermodynamics, heat doesn't naturally move from a cooler object to a hotter object, or as Flanders and Swann would put it, "heat don't move from a cooler to a hotter" (https://youtu.be/VnbiVw_1FNs?t=127 https://youtu.be/VnbiVw_1FNs?t=127) [1]
GordonS 6y ago
Have you ever been in a house attic on a hot day? It's absolutely stiflingly hot! It was perhaps 22C at my home yesterday, and by chance I had to get something from the loft - I'd be surprised if it wasn't 30C.
- ajb 6y ago
  Okay, I concede that Attics could be 30 degrees, at least some of the time :-) Mine probably isn't because the insulation is on the 'floor' of the attic, so it should be approximately the same temperature as the outside air (well, if it were ventilated properly). This is one of the design choices of an attic. Still, I do wonder if this provides enough hot spaces for mice to have evolved to expect a 30 degrees environment. Maybe they do in some places.
  - GordonS 6y ago
    > Mine probably isn't because the insulation is on the 'floor' of the attic Hmm, mine too. > Still, I do wonder if this provides enough hot spaces for mice to have evolved to expect a 30 degrees environment Yeah, this does seem quite questionable to me too, at least for temperate countries.

2 ms·

Walls may be better insulated, but to accumulate a high temperature you need a source of heat. Where is the source of heat in a wall? For attics you might be on

by ajb 6y ago

zxwx 6y ago
The sun is the heat source.
NeutronStar 6y ago
It's 30 degrees outside all the time. Do you expect every house ever built to have been using AC?
crooked-v 6y ago
> Where is the source of heat in a wall? The rooms around it.
- ajb 6y ago
  The claim is that the walls can be hotter than the room around it. By the second law of thermodynamics, heat doesn't naturally move from a cooler object to a hotter object, or as Flanders and Swann would put it, "heat don't move from a cooler to a hotter" (https://youtu.be/VnbiVw_1FNs?t=127 https://youtu.be/VnbiVw_1FNs?t=127) [1]
GordonS 6y ago
Have you ever been in a house attic on a hot day? It's absolutely stiflingly hot! It was perhaps 22C at my home yesterday, and by chance I had to get something from the loft - I'd be surprised if it wasn't 30C.
- ajb 6y ago
  Okay, I concede that Attics could be 30 degrees, at least some of the time :-) Mine probably isn't because the insulation is on the 'floor' of the attic, so it should be approximately the same temperature as the outside air (well, if it were ventilated properly). This is one of the design choices of an attic. Still, I do wonder if this provides enough hot spaces for mice to have evolved to expect a 30 degrees environment. Maybe they do in some places.
  - GordonS 6y ago
    > Mine probably isn't because the insulation is on the 'floor' of the attic Hmm, mine too. > Still, I do wonder if this provides enough hot spaces for mice to have evolved to expect a 30 degrees environment Yeah, this does seem quite questionable to me too, at least for temperate countries.