MarkDH102 wrote:Do I also detect a small oscillation of the temperature that is in synch with the humidity oscillation?
Are you sure the AC unit isn't switching on and off in a similar cycle?
What period of time does a complete up/down humidity cycle have? Can you relate that to anything that may be happening externally?
The oscillation, in my opinion, is pretty extreme because the RH (Relative/Humidity) readings can go from 50 range to 70 range in about 15-20 minutes time before it goes back to 50 range again. So that's how long the time frame for each 'spike' usually is
How do you check the AC unit is switching on/off in this time frame ?
This is not the kind of eco-AC that has that automatic on/off feature, I suppose it's everyday standard central AC that you can only set :
1. You want it to cool/dry/fan
2. The temperature
3. Timer for it to switch off after 8 hours for example
The AC people that I invited the other day said that there may be leaks coming from outside air that came into play, and suggest that sealing the leaks may help stabilize the humidity. Well, we just did that but the graph is pretty much the same. There are still spikes ...
For other facts, I live in Indonesia and boy, we are hot and humid down here ... outside temp is usually at 30C and humidity level is about 75%