funny, how you so often need same info many times in one day. i was watching this old house and the guy asked a question i never thought of. why do they never compare the wood windows in the comparisons. because wood is the best and they rarely make because noone can afford. don't get new. get your odd jobs guy to do more insulating, clean all old paint and apply new if needed and you will much happier with the results and pay less probably.

did not think of it. maybe get rid of marble it will transmit temp. and you can apply clear plastic, because it does not transmit temp. I note you have no screens. i would have a frame. slide in screen for summer. plexi for winter.

I would never replace them. It is good that you have the storm insets. A friend of mine had custom made inserts attached to her windows. Another friend has these windows and they have retractable screens. Maybe you can find some of those.

They look like old Pella’s , I just repaired some not. Long ago that still had the roll screens intact. They are beautifull Windows

Find a craftsman in your area who can take down old sashes, rebuild them and re-install them. He may be able to put an extra pane of glass on the outside to insulate them better. Don't replace those, they're gorgeous, rebuild them!

Keep them. Maybe add insulated shades for winter use.

i am sure you can find someone to install screens, more useful.

I had roller screens attached to my windows. I couldn't imagine having windows open without screens. I bought one some time ago but I am sure they were custom as the guy came out took measurements and then a few weeks later came back and installed them.

I lived in an old Spanish Colonial home that did have the original pull down screens. As I recall the windows themselves opened out so pull down screens have been around as a technology for awhile. :-)

You may need to have the spring bronze weatherstripping replaced. It's possible to DIY if you are handy, or check with a local window restoration company or ask your neighbors if they know anyone who does that.

Those windows are incredible and I would never replace them.

What material are these made from?

Please, please do not replace these windows. As others have said, it will devalue your house.

I looked for over 2 years for an older house in my neighborhood that hadn't been remuddled and couldn't find one. If I had found one, I would have gladly paid a premium.

Well, I'm glad I asked the Houzz! Consensus says keep the windows, so keep them we will. They are BEAUTIFUL and drafty as all heck. We purchased Indow Window inserts and they are AMAZING. They also are buffer sound beautifully. Highly recommend them. I will find a specialist to help us restore them - and will post the results. Thank you all for your recommendations!

Oh thank you for not remuddling. Your house thanks you and so will future generations.

I had a 1927 house that the next owner went and put in vinyl windows. The house looks awful now.

What material are these windows made from?

At that age, they are either iron or steel unless they are very special and then bronze (doubtful).

To the OP: Those windows can indeed be made airtight, so do go for it.

The Moorestown Community House has windows like that and dates to a couple of years before your home. They absolutely make that house. It was built by the founder of Victor Talking Machine Co. (later RCA) in Moorestown, NJ, a wonderful town a few miles from their headquarters in Camden. Great building with great windows.

@lyndee lee way too many windows! I'll post some more photos tomorrow - I wish there was a way to select and post multiple photos. We are now in a gut renovation bc all the pipes froze in January (oil in tank gelled and the boiler shut off... we returned from vacation 5-days later to a frozen house). We will have to remove the windows in the basement to put in egress windows but all the other windows will stay. House was built in 1931 so I'm not sure what material that makes the casements. Thank you all for returning me to my casement window senses!

I wish there was a way to select and post multiple photos

I think that at the moment there's a glitch that means only one photo in the OP, but you can post multiple photos in a reply.

I can only hope that window manufacturers are reading this thread. You're considering replacing windows that are 90 +/- years old. The modern versions available to you have a life expectancy of roughly 1/3 that of your current windows.

A couple of ways to improve performance: 1.) inspect and replace weatherstripping as needed; 2.) pop off interior trim and install spray foam sealant and 3.) use a tight fitting insert like the Indow Window as you are doing.

Keep those gorgeous windows!

I think what you have done already is the answer but to really get any real improvement in performance you will need to do all the windows with inserts and the sad part is that without them the heat also comes in so screens are not going to work.

They're so beautiful! Consider some heavy window treatments, perhaps? Here is a good guide: Window Treatments 101

Definitely a candidate for repair and NOT replace here. Too much character to change them out.

Do these windows open INWARD? (Grew up in a house with those kinds of handles that did and the "cure" for these windows was a storm window.)

If your windows do open inward, before you make a final decision, at least check about adding a storm window outside of this window with a frame that surrounds this window frame. Some storm windows open/close, some are just a single solid sheet of thick glass.

Also consider:

Adding an old style solid roll up shade (emphasis on solid) would help to create a "dead air" space between window and shade at night to help minimize "heat exchange".

Adding lined drapes can also help. (Choose two cloth fabrics -- NOT that awful rubbery foam stuff that isn't really washable or dry cleanable and can stick to itself and peel off the fabric ... yeah, been there, done that.)