The problem
Original steel windows are costing you comfort, security, and value.
Steel frames rust from the inside out and the rust never stops once it starts. The windows scrape and jam. The putty cracks and falls out, leaving glass loose and gaps for wind, dust, and noise. Single-pane glass does nothing for insulation and very little for security. Every year you patch and repaint, the problem gets a little worse and a little more expensive, and the house looks more dated. At some point patching stops making financial sense and a proper aluminium replacement is the only real fix.