The best time for you to finance new windows is when the cost of these windows is large and the need for them is immediate. Instead of putting down all the money at once and impacting your wallet, you should look for a financing plan that will allow you some financial breathing room and leave you and your home and family more comfortable. Often, a replacement window is an emergency procedure that needs to be done as soon as possible. This gives you even more reason to look at a financing deal instead of paying the entire amount outright. A broken window gives you enough of a headache, you don't need more of a hassle with the financial burden.