To install uPVC windows is not easy. You can do it yourself if you are an experienced do-it-yourselfer, but for the average home owner it is a task too difficult to attempt. Often when you purchase uPVC windows the dealer will offer an installation service as part of the price.
Typically a 6 sided uPVC bay window with top opening window can cost you $2,000. For $7,000 you can buy and get installed 10 uPVC windows and 2 doors. Obviously the bigger your purchase the greater the discount you can get on individual items and the cost of installation.
This may seem like a lot of money. But you must consider the money you will save.
If you install uPVC double or triple glazing you can expect to save in the region of 20% on your yearly heating costs. This is a big saving. It means that in a matter of 2 or 3 years the uPVC windows have paid for themselves. That is an important consideration when looking at replacing your windows. Buying timber frame windows are also expensive but don't offer the same big energy saving gains that uPVC windows do.
The reason why uPVC saves you money on energy bills is that it has a higher thermal resistance than wood. It doesn't let out as much heat as wood. Combine the high thermal resistance of uPVC with the insulating properties of double and triple glazing and you can see how uPVC windows are more energy efficient than timber frame windows.
Finally, the fact that uPVC windows will last over 30 years means that not only will they pay for themselves, but in the long run they will save you money. In short you cannot afford to not install uPVC windows.