this post was submitted on 11 Jul 2026
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I have a ground floor brick apartment so I'm pretty well insulated from the summer heat for most of the day. If I can get the apartment cold enough at night by running fans (ventilation), I can often make it through the day without turning on the A/C.

That small room is the best case scenario because it has the box fan blowing in directly opposite the door which has a fan at it to pull the air out of that room.

The closest I get to the coldest night temperature is 4 degrees farenheit in that room. I'm guessing the walls are retaining some heat.

Is 4 degrees a respectable delta for $20 Lasko box fans or could I do better?

I'm cross ventilating as much as I can, but I have a weirdly shaped, weirdly windowed apartment and think I need about 3 more fans to circulate the air completely, but I don't think I do better than what I have for that one room.

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[–] fullsquare@awful.systems 4 points 20 hours ago (1 children)

I’m guessing the walls are retaining some heat.

Guesstimate your own numbers, but the way my flat is built walls have heat capacity some 150x more than air inside. (reinforced concrete building, walls/floor/ceiling counted as half if shared with other flats) You will need to run a lot of air through, at at least couple C temperature difference, to make a dent in that

[–] IcedRaktajino@startrek.website 3 points 18 hours ago* (last edited 18 hours ago)

Yep. My house is block and brick and just soaks up heat all day and very slowly releases it at night. Unless there's a 20-30 degree (F) difference, it just doesn't cool down at all. It's even worse when the night time temps don't drop significantly until just an hour or two before dawn when it starts heating back up again.

That's great in the winter since a sunny day can "store" heat for the night, but it's miserable in the summer and you basically just have to pump it out with A/C.