The answer to this question depends on a number of factors, including the age and condition of your house, the type of windows you're looking to install, and your budget.
If your home is older and drafty, replacing single-pane windows with energy-efficient ones can help improve its comfort level and make it more affordable to heat and cool.
And if you live in an area with extreme weather conditions (like high winds or freezing temperatures), new windows can also help protect your home from damage.
On the other hand, installing new windows can be expensive—especially if you need custom sizes or shapes to fit your home's existing openings.
So before making any decisions, it's important to do some research and get estimates from several different companies.