Hi
My friend just moved house, and realize the humidity is very high (70%).
In the previous house, he got around 40% humidity. He has xiaomi purifier which shows humidty level.
Is it normal for Melbourne house?
Does he need to use dehumidifier?
Thanks
I wouldn't worry that much, 70% isn't too bothersome.
recently had some rainfall (99% RH for a week or more) and some of my home decor made from hyacinth grew mould.. gnarly
Mine normally sits between 70 and 80.
It’s sad watching my childhood possessions get destroyed by mold.
I’m trying to find solutions, but am lazy so I just bought a dehumidifier and started running the heaters more. Seems to help.
I had the same question a few days ago, when my duna felt damp. I got the humidity meter from my humidor, and it went up to 100%.
It was still in that rainy/drizzling period. I managed to get it down to 80% with airing during non rainy day, and kids room turning AC on and dehumidifier in our room. Plus heat fan and extraction fan under our room under the house.
Now with the dry weather it's finally down to ….. ( walking to our room and getting back to the computer ) …. 61% humidity at 13oC ( freeking cold )
Kids rooms with A/C 50% and 23 oC.
like SF3 said, if the outside is humid, your only option to go lower than that is AC and heating.
Ideally it should be around 50% ( heard-say )
I would like to know more about this heat fan. Do you have a link? Thanks.
Heater fan is something like this below, but Bunnings does not have it anymore
https://www.ozsale.com.au/product/Shogun-2000W-2-in-1-Portab…
This is the Extraction fan
https://www.bunnings.com.au/bristol-300mm-extraction-fan-5m-…
Our Netatmo station reports on average around 50% RH indoors.
Without engaging in massive expense of running dehumidifiers, heaters, air conditioners, etc., you're going to have a difficult time changing the inside humidity from that outside. Simple "osmosis" will cause these to balance up fairly quickly.
Relative humidity heavily depends on the temperature of the air.
If you turn on your heater your humidity can go from 70% to 40% RH but there's still the same level of moisture in the air.
As soon as you turn off the heater and the temperature drops the relative humidity will go back up to 70%.
Glad you created this post. I had the same concern. My inside humidity is usually about 10-15 less than outside.
Outside RH for me is 96% now while indoors is 82%. I've seen it much lower, eg, 56% inside when outside RH was around 66%.
I've seen no evidence of mold or mildew.
On a budget, the best you could do is keep the bedroom windows open a few centimetres at night to allow airflow - breathing during the night will increase humidity. Open windows a bit during cooking. And run the bathroom fan when showering.
It all depends on the outside humidity.
Unless cooking/boiling water with windows and doors closed. Or hot shower without exhaust fan and letting the air spread around the rooms…
In NSW was 80%+ for a few months, now it is ~40-60% indoors.
Therefore it depends…
TLDR: Melb current HUMIDITY 66%, your friend seeing 70% seems normal.