Hey chillout!
Replacing windows on your home can save you up to 25% in air conditioning and heating costs a year. This reason alone makes new windows one of the most attractive investments for your home.
When you hear "aluminum windows, The very properties of aluminum that are a real asset in other situations - the fact that it's a very efficient conductor of heat and cold - aren't such a boon here, as it very efficiently conducts the outside temperature into your home instead of keeping it out. In cold weather, this also leads to condensation of moisture on the chilled glass, or even frost.