There are over 1,000 NWWDA certified wood windows on the market. Some manufacturers only have some of their window lines certified. Here is a partial list of NWWDA Hallmark Certified wood windows to help you with your decision.

Each component of vinyl windows affects its performance. The quality of vinyl replacement windows varies by maker. Look for certified standard labels with AAMA, NWWDA, NFRC and/or Energy Star to assure you are buying vinyl windows of highest quality. NFRC or Energy Star certified windows reflect high caliber energy efficiency.

Window installation should be done by the company that sold them to you, by their employees -- not a sub-contractor. Whatever company you select for your windows, check insurance coverage and get all promises in writing.

Energy Star windows? AAMA-NWWDA? NFRC? What are all these letters about? Each signal significant quality in Energy Star vinyl windows. Energy Star and NFRC standards signify windows with high energy efficiency. AAMA and NWWDA certify quality materials. Any or a combo of these labels on your vinyl windows should give you great peace of mind.

Spend as much as you can on window glass that has the lowest U value. The insulating properties against heat loss/gain are best accomplished with invisible heat film.

Window film comes in so many varieties that it can be confusing choosing the right one. Check your windows and note what you need to accomplish in the room, whether protection from fading, heat loss/gain, or privacy window film. Purchase the corresponding film for that room that solves the need. Follow these tips for proper cleaning of window film, and how to remove it.

Window films can be clear, colored, reflective or a combo. Each type of film accomplishes a different task. Know what problems you want to solve with window film before buying your new windows.

These three questions about window film are likely buzzing in your bonnet as well.

A listing of window film companies and contact information to find good installers.