High Performance WeatherPRO windows exceed the Energy Star standards in the vast majority of cases. (Garden windows have lesser performance). Windows are rated by U Value. The lower the U value the better for energy performance. In the Seattle, Tacoma, Olympia and Western Washington areas a U Value of .35 meets Energy Star Performance Standards. Many of our windows have U Values of .28 which exceed Energy Star standards by 20%!!!
There is variation in the rating by window style. The more opening window vents the lower the U value because the formula takes into account wind infiltration in high speed wind tunnel testing. Most of our opening single hungs still retain an unbelievable U Value rating of .29. That shows near perfect seals.

If you look at U values of many production windows you will find a range of .35 to .49. Another way of looking at these numbers is that they perform 20-60% worse than our WeatherPRO Window design. Our windows perfom quite similar to many triple pane windows on the market which is why can offer a 40% fuel savings pledge.

Check the Window Stickers for Certification (Proof of Performance Statements)

In today's competitive window industry, there is often an incentive to make things as cheaply as possible. There is an incentive to tell people that your windows have great performance values! High performance glass, top of the line sealing systems, gas fill, etc. all cost money. One way for companies to save money is to promise these things and not deliver. The only way a consumer can know he is getting what they paid for is buying a certified window. (One that has been inspected)Some well known window companies have avoided certifying their windows for years. Windows are supposed to be certified and have a gold certification label by an independent testing lab on the frame. When a window manufacturer agrees to become certified they are agreeing to spot checks by an independent agency to prevent the company from cheating homeowners by checking that their energy ratings are honest.

WeatherPRO Windows are built by LBL Windows for Northwest Home Improvement Co.(NWHI) to meet their requirements. WeatherPRO Windows come standard with features NWHI requires in order to offer homeowners the additional warranties and the benefits that NWHI believes homeowners want and need. All windows made for NWHI feature High Performance Glass, Super Spacers(for superior window performance and gas retention between the panes), Argon gas fill, foam filled frames (except Bay, Bow, Garden window frames) for added insulating value, interlocking sash rails for tight seals and great locks. The end result is a fantastic certified performance label and performace that rivals triple panes for a fraction of the cost! Truly a great value for the public on a feature rich, beautiful window.

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