We live in a home built in 1859 that is listed on the registry of State and National Landmarks. The home was originally built as a summer home and therefore has no insulation in the walls. The windows we purchased from Indow have made a HUGE difference in the cooling of the house and we are very excited to see how they perform this winter. The change in the feel of the rooms was immediate and within just a few hours, the drafts were gone and the humidity was non existent! The measuring, ordering, and installation was very simple and the representative we communicated with from Indow via email was very responsive! We could not be happier and we highly recommend these windows! Our only regret was that we didn’t make the purchase years earlier! Thank you! Renee & Charlie Parker