Ask for the CPD number and the structural test reports. I don't know the window but I can give you some more directed feedback based on the data of those two items.

I just realized I spelled the name wrong in the "title". I corrected it. Aeris

@ windows on washington--I'll see what I can find out. Thank you very much!

This is the reply I got from the company.

I'm sorry. I'm not familiar with a CPD number. Can you tell me more about what that might be? I do have structural test results, but I'd need to know specifically what you're looking for and then provide you that information. I cannot sent out the full report. I'm sorry. Let me know what you need, thank you!

I found this on their website. Does it tell you anything?

They are the CX 900 Series double hung.

Here is a link that might be useful: Aeris Technical Sheet

Data looks pretty good.

Air numbers are average, not great, but not bad.

Same for the thermal data.

Unfortunately I don't have any personal experience with the window so that is all I can offer in this case.

@ windowsonwashington--thanks so much for your help & taking the time to reply!

Well, we ordered the windows. My husband thought they were good, so we will see. I'm pretty sure they will be better than what we have now. They were pretty close to Marvin in price.