Indoor Humidity

[Marko]

It’s currently-2 here. What’s peoples indoor humidity readings been like?

 

We’ve had our system operational for around two weeks and I suspect various elements have been drying out over that time. We’re sitting at 55% at the moment. 

[SteamyTea]

While you are at it, why not see how it correlates with outside temp and RH from nullschool.net

 

[marshian]

Between 55 and 60 in all areas except the loft - thats crazy high

[FarmerN]

Zender MVHR unit currently showing

Extract air                             18 deg C                              53% RH

Outdoor/ Sullpy  air         -0.5deg C                             94% RH

 

Various digital RH meters round house showing all sorts of ridiculously low figures-

kitchen                                 21.5 deg C                           39% RH                

I don’t trust any of the digital readings really and keep meaning to buy a Wet/Dry bulb thermometer to see what that says.

[JohnMo]

Currently at 39%, 2 of us and a dog. Which pretty normal when is been cold for a few days.

 

But it's been very cold, mostly at about zero and downwards.

[ProDave]

34% in the living room here.  It's been sub zero for several days now, not much moisture left in the air.

[Beau]

PWS readings. Outside RH 94%  0.8C 

 

 

Got a couple of monitors that read the same when in the same room. 

 

Kitchen 20C   47%RH

Utility    18C   35%RH

 

 

[Conor]

-2c outside. 91% RH

18.5c inside. 41% RH 🫣

 

And that's with laundry drying upstairs and the mvhr on min fan speed. Heating off most of the day, just back on there at 5pm when we dipped down to 18c. My lips are drying and cracking as I type 😄

 

Edited Wednesday at 21:42 by Conor

[Jilly]

20.8c 47% RH inside. Cold and damp outside. 

Edited Wednesday at 21:40 by Jilly

[marshian]

3 hours ago, FarmerN said:

Various digital RH meters round house showing all sorts of ridiculously low figures-

kitchen                                 21.5 deg C                           39% RH                

I don’t trust any of the digital readings really and keep meaning to buy a Wet/Dry bulb thermometer to see what that says.

I have two sonof temp and humidity meters and following some helpful advice from @Sparrowhawk on how to calibrate the sensors I trust them much more than I did

 

All you need is a bit of salt

[Kelvin]

Varies from room to room with a high of 43% and a low of 31% (this sensor is right by the back door). Most rooms are around 38%. These are readings from the Loxone light switches which can measure temp and RH. What I’ve noticed is the temp readings between the Loxone switch and the Heatmiser thermostat (both near each other) can vary by as much as 2°C with the Loxone switches always reading lower. The MVHR extract RH says 32%. House temp is 21°C downstairs and 17.5°C upstairs. Outside temp has been below freezing for two weeks or so. No problems with dry skin etc though. 

We had some large chopping boards made by a local guy both of which curled very slightly (about 1mm or so) enough that they rocked very slightly. He makes loads for the local area and it’s never happened before as they all generally go into older properties where the RH is higher. I fitted wee silicone feet to them. 
 

I have bought a humidifier to use in the TV room where I also keep my guitars although I’ve put them all back in their cases. 

 

 

[JohnMo]

2 hours ago, Kelvin said:

large chopping boards

I made one, it also slightly warped. Was drying outside for 3 years. Made in the summer and had time to slowly dry out. Board is pretty big 50mm thick and 400 x 600.

 

Made a smaller one over Christmas and that cracked all over after a week inside, no time given to slowly dry.

[Kelvin]

He stores the wood for at least a year before working it. He took the larger one away to refinish it so it’s very nearly flat now. The smaller one is butcher’s block style  using the end grain which is just used for meat isn’t showing any other signs apart from the slight warping. I was concerned it might start to come apart. He also made our dining table but he said it will need refinishing after being in the house for 6 months or more. 

 

I have a large oak off cut sitting in the garage left over from the utility room worktop that I intend making into a chopping board. 

[Mike]

12 hours ago, marshian said:

I have two sonof temp and humidity meters and following some helpful advice from @Sparrowhawk on how to calibrate the sensors I trust them much more than I did

 

All you need is a bit of salt

That is worth doing. Last year I calibrated a batch of 16 SHT31-Fs temperature-humidty sensors (though they're not currently recording) and while the temperature recorded by of all was consistent (within 0.1°C of each other), the humidity reading was out (too low) by between 0.6% and 2.55% compared to the expected result.

 

[Kelvin]

https://ruuvi.com/how-to-calibrate-a-hygrometer-or-air-humidity-sensor/