It's never been more important to replace drafty windows in your house. Design technology has advanced to the point that you can experience significant and often dramatic changes in your home's comfort and, most importantly, energy savings.
There are many options for replacement windows.
1. Wood: Wood is one of the most expensive and potentially high-maintenance alternatives, especially if you want wood exteriors on the windows. Many manufacturers offer wood for the interior and composite or fiberglass exterior. They can be ordered in a variety of colors, so you don't have to paint them. You can buy windows in Kitchener at https://windtek.ca/kitchener-windows-and-doors/.
2. Vinyl: Vinyl windows have advanced a lot in the past few years. They are strong, attractive, and easy to maintain. They still need to be washed. You can also choose from a variety of colors. They can't be painted so the outside and inside will match. Vinyl windows are also a cost-effective option.
3. Fiberglass/Composite: These windows are available in many colors and they never have to be painted. You can also paint them any color you like. The frame is made from glass fibers so it expands and contracts at exactly the same rate that the insulated glasses hold. This reduces stress on seals and decreases the risk of them breaking. Vinyl and wood or wood-clad are generally the prices.
Find a reliable contractor that will give you the options that you need.