On 1/16/2020 10:44 AM, TD90 wrote:
We had our windows replaced 3 months ago..It's winter and cold..is it
normal
for Frost to form on the inside of the Windows

Depends on what you have. Single or double pane? Storm windows? Metal
frames? Frost on the glass or frame?

If you live in a cold climate you should have a good double pane window
and you will never see condensation.

What do you have? What state are you in?