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You'd be surprised what a couple degree difference can feel like. In Queensland we turn the AC to only 3 degrees below the outside temp and it feels way colder

You'd be surprised what a couple degree difference can feel like. In Queensland we turn the AC to only 3 degrees below the outside temp and it feels way colder inside.

harperlee 7y ago
3 degrees is indeed a lot, but you will only have the temperature sensor that regulates indoor temperature in a specific place so, depending on placement, other areas of the room can get way colder. Also they typically have builtin hysteresis so they only react when they go below a threshold of difference. Lastly most HVAC systems also manage humidity so heat sensation varies more.
zaarn 7y ago
The AC also removes moisture from the air, which makes it feel much cooler as sweating becomes more effective (if moisture is low enough, you can feel comfortable at 35C with no wet spots)
- masklinn 7y ago
  > if moisture is low enough, you can feel comfortable at 35C with no wet spots Conversely if moisture is high enough, you can be dying at 35C (35C WBT is the point at which the human body can't shed heat to the environment anymore).
  - zaarn 7y ago
    Atleast according to Kachelmann, a german weather reported with some controversy behind him, stated that most heat-related deaths could have been prevented if moisture had been lower; if people who only vent during the night would pull in extra moisture and just make it hard on them. He recommends to always leave the window open so fresh air can move in and out. (Note that this is in germany, we don't have regular AC so leaving your window open or tilting it is the only option) But yeah, at WBT 35°C you're going to start running into thermal problems. At that point your best bet is lots of cold water (careful you don't overhydrate, that's equally dangerous as dehydration in the heat), that can probably push you to 37C WBT. But beyond that it's basically a race against stress shutdown of your body to get some effective method of cooling going.
- 0xdeadb00f 7y ago
  Good point! Can't believe I didn't consider that. QLD is very humid too.
  - zaarn 7y ago
    Atm I'm fighting a 25C/80% humidity weather, during the heatwave the worst was 44C/70% (measured on my own station, officially my location had 39C, and it could have been higher but my sensor isn't designed for more than 45C)

You'd be surprised what a couple degree difference can feel like. In Queensland we turn the AC to only 3 degrees below the outside temp and it feels way colder inside.

harperlee 7y ago

3 degrees is indeed a lot, but you will only have the temperature sensor that regulates indoor temperature in a specific place so, depending on placement, other areas of the room can get way colder. Also they typically have builtin hysteresis so they only react when they go below a threshold of difference. Lastly most HVAC systems also manage humidity so heat sensation varies more.

zaarn 7y ago

The AC also removes moisture from the air, which makes it feel much cooler as sweating becomes more effective (if moisture is low enough, you can feel comfortable at 35C with no wet spots)

masklinn 7y ago
> if moisture is low enough, you can feel comfortable at 35C with no wet spots Conversely if moisture is high enough, you can be dying at 35C (35C WBT is the point at which the human body can't shed heat to the environment anymore).
- zaarn 7y ago
  Atleast according to Kachelmann, a german weather reported with some controversy behind him, stated that most heat-related deaths could have been prevented if moisture had been lower; if people who only vent during the night would pull in extra moisture and just make it hard on them. He recommends to always leave the window open so fresh air can move in and out. (Note that this is in germany, we don't have regular AC so leaving your window open or tilting it is the only option) But yeah, at WBT 35°C you're going to start running into thermal problems. At that point your best bet is lots of cold water (careful you don't overhydrate, that's equally dangerous as dehydration in the heat), that can probably push you to 37C WBT. But beyond that it's basically a race against stress shutdown of your body to get some effective method of cooling going.
0xdeadb00f 7y ago
Good point! Can't believe I didn't consider that. QLD is very humid too.
- zaarn 7y ago
  Atm I'm fighting a 25C/80% humidity weather, during the heatwave the worst was 44C/70% (measured on my own station, officially my location had 39C, and it could have been higher but my sensor isn't designed for more than 45C)