Relative Humidity

Today was chilly, but refreshingly sunny out, and the high winds (gusts of 40-50+ miles per hour) of the last several days finally calmed.  By the time I got home from work today the sun had warmed the porch enough again so that the cats really wanted out there.  They always want out these days when the sun is out because they know it can get even warmer than the house.  The porch does face south and the sun is starting to get higher in the sky and warmer, surely spring is coming!  I let them have access for, oh, maybe 90 minutes or so until the sunbeams left us.  My wife was home by then and they were inside, anyway.

When I went to shut the door I saw something I had never seen before.  Well, not like this.  The porch windows had condensation on the inside.  It was 24ºF (about -4ºC) outside the single pane cheap porch windows and 72ºF (about  24ºC) inside the house, the porch felt similar when I let them out, slightly cooler when I went to shut it.  The humidity outside, according to my weather app, was 24%, while inside I got a reading of 43% relative indoor humidity from the humidifier controller on the air return vents downstairs, and a reading of 37% upstairs in the computer room off the porch.  That's a lot of numbers.  I found it interesting to check for those numbers when I saw the effect.  Like I said, I have never seen this before.  I've seen the condensation on the outside, making it look similar, but never the inside.

The humidifier we had installed just after the beginning of the year has been a very good investment for our cold, dry, winter air.  The best part is that we never have to think about it.  No constantly filling up the tank, changing expensive filters every 10 days, no dripping water on the floor.  No muss, no fuss.  Twice a year I have to move the damper from 'summer' to 'winter' or back, and once a year change the water pad.  I think we made a very good investment, indeed.

Other than that, all has been well enough, I guess.  I have a few things I could mention, but I should have time this weekend that I may post another This-And-Thats.  Outside, there's no snow around, really, and just a few inches in the forecast for Monday.  Now if we can just get temperatures to stay above freezing...  I mean, really, there's already plants coming up!