Sash windows are strong and can last you a long time, but even they run out of breathe eventually. Depending on the condition of your current window, refurbishment can be just as costly as buying a new one. Sash window refurbishment is expensive and is arguably worse than buying a new window. There are many more advantages to buying a new window than there is for restoring your old one.
Restoration is a very expensive process. Even after you have them repaired, you will still have to spend a considerable amount of money on regular maintenance. Apart from being expensive, restoration is very time consuming. You will have to take a lot of time and effort out of your already busy life to try to find parts, which more often than not have been discontinued.
Restoration is also not very energy efficient. Older windows have poor insulation due to their single pane design. They let too much heat in during the summer and allow too much heat to escape during the winter. This will force your air-conditioner to work overtime to keep you comfortable. Be expected to see an increase on your electric bill because of this.
Refurbishment may seem quick and easy, but it will cost you greatly in the long-run. Older designs demand considerable amounts of money and attention and you will eventually have to replace them anyways. A newer window will require less maintenance and will last longer and serve you better.
Try replacing your old sashes with double-glazed ones. They are safer and will help keep your electric bill down. Some windows are even sophisticated enough to offer climate control features. Double-glazed panes are also tougher than single pane windows and will have better ventilation.
The safety features on newer windows are better than on older ones. New limit stops will prevent the screen from opening past 100mm. This is an excellent feature if you have small children running around in the home. Safety stays do not let the screen tilt inward too far. That inward tilting problem is what caused many previous accidents. Simply restoring your screens will still leave you vulnerable to various safety hazards.
Newer screens also better protect you against intrusion with a complicated mechanism known as cam catches. Cam catches is a locking system that makes it extremely difficult for your screen to be opened with a small knife. They protect you against both front and side entry. They are made with nylon, so they are extremely durable and rust-resistant.