Use 1" furnace filter instead of 5" ?

At 71 F my chart shows you're still in the comfort range down to 27% humidity, of course people vary.

If your walls are uninsulated masonry you might be losing body heat through radiation to the walls and that can make you feel cold. Radiation loss is a factor of the difference of the two temperatures raised to the 4th power.

There is another consideration. I've just read that the reason we have more colds and flus in cold weather is due to humidity. In low humidity the aerosols you expel quickly evaporate partially, keeping them small enough to travel much farther and stay aloft much longer. In high humidity the larger particles fall or stick to surfaces.

Interesting about the aerosol dynamics. It makes sense.

I think this might be the article I read.

I'm not sure that's a consideration in my circumstances. My husband and I share the same germs anyway.

Cindy Hamilton

I work at home, SWMBO works out in the real world. She works in the medical field and is exposed to a lot of stuff. I do what I can to stay safe, but avoiding the love of my life isn't on that list.

We have easy access to a drive-through Covid testing site. Takes 30-60 minutes (depending on the line) from when we get in our car to when we get back home. It's our weekly date night.