Low E Glass – Savings and Comfort

That Warm Feeling

Those of us who live in colder climates have often felt a draft or cool breeze when sitting near a window. Often there is minimal air actually leaking through or around the window. What in the world is happening?

Different glass assemblies can have widely different R values. (see table 1 in this linked article) You should be able to infer from this that the actual surface temperature of each type of glass might also be different. No doubt about it, they are.

If the surface of a window glass is much cooler than the surrounding room air, a circular convection current actually develops around the window. Room temperature air rubs up against the window, gets cold and this air falls to the floor (cold air is heavier than warm air.) This sets up a sort of spinning wheel of air around the window. If you are sitting near this window, you are in the midst of the moving air! The surface temperatures of different glass assemblies can be dramatic. For example, assume an outside temperature of 0 degrees and a stiff sustained wind of 15 mph blowing against the window. The inside surface temperatures of the different glass assemblies would be as follows:

Single pane 26 degrees
Regular double pane insulated glass 35 degrees
Hard coat Low-E 49 degrees
Soft coat Low-E 62 degrees

Obviously, the closer the glass temperature is to the actual room temperature the less convection there will be near the window. Low-E glass simply works.

Low-E Films

At least one residential window manufacturer - Hurd Millwork - has gone one step further. They have incorporated a special Low-E film in between two pieces of insulated glass. Often the air space between the film and each piece of glass is filled with an inert gas such as argon.

These windows apparently offer higher performance than even the best soft coat Low-E. If I were in the window market now, I would give this system a serious look.

Ultraviolet Light (UV)

All of the Low-E window glass products block UV light. However, some do a much better job than others. If UV degradation of fabrics, carpeting, furniture, etc. is a concern, then be sure to ask specific questions about the amount of UV light that the window blocks.

Some blockage percentages are high. Most of the manufacturers listed offer glass that blocks anywhere from 70 to 99.5 percent of the UV light from the sun. That is impressive.

In Conclusion

If you are shopping for windows, I highly recommend that you spend the extra money for Low-E glass. There is no doubt that you will recapture the extra money in fuel savings. You will also be more comfortable.

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Window Manufacturers and Low E Glass

 

 

 

Ten Window Manufacturers
and
Their Type of Low E Glass

 

 

MANUFACTURER

Soft Coat

Hard Coat

Low E Film

Andersen Windows Yes No No
Windsor Windows & Doors Yes No No
Crestline Windows & Doors Yes No No
Great Lakes Window Yes No No
Hurd Millwork No No Yes
Marvin Windows and Doors Yes No No
Peachtree Doors & Windows Yes No No
Pella Window Corp. Yes Yes - tempered glass No
Jeld-Wen Windows & Doors No Yes No
Weather Shield Windows Yes Yes - tempered glass No

Glass Associations & Organizations

If you would like detailed, technical information concerning Low-E glass, browse the following web sites. They may be able to help you.

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Vinyl – Aluminum Combination Windows

Vinyl / Aluminum Combination Windows

Have you started to talk to replacement window sales people yet? It will be an experience, I can assure you of that! Some of these people could talk their way out of a date with the Devil himself! On the other hand, some of them are highly professional and will treat you with the highest respect. It is very likely that you will readily see the difference between the two.

All you have to listen for are the tall tales, exaggerated claims and the hollow promises. That will be the signal of the imminent shakedown. The professional salesperson will provide you with facts, written documentation of claims, and a list of truly satisfied customers.

The Payback Period

Whatever you do, don't buy vinyl windows because you think they are going to pay for themselves. This claim is simply not true. How do I know this? Here is a very simple example.

What is your average heating bill per season? To calculate this look at your oil bill or the portion of your heating bill that deals with gas (You fully electric people are going to have a tougher time..). The gas portion of my utility bill averages about $110 per month for 7 months during the heating season. Subtract from that the gas for the hot water heater, clothes dryer, and cooktop. Let's say that I'm left with $85. This means that it takes $595 per year to heat my house.

OK. Let's say these super duper new vinyl windows are going to save me 25% (I'm not saying I believe that number, mind you...). A 25% savings represents $148.75. For now, let's forget about inflation.

What are your new windows going to cost you? Let's say that the average house will cost about $8,000 to fit with new high quality windows. How long will they last before you need new ones? How about 25 years?

If my math is right, it is going to take nearly 54 years to pay off the windows.......... ($8,000 divided by $148.75). Hang on, because this gets much more interesting.

Interest Income

For sake of discussion, let's say you were going to extract the $8,000 from your hard earned savings account. At current interest rates, you are probably getting about 5.5% in a one year CD. This means your $8,000 is spinning off $440.00 per year in interest! Think. You could actually keep your $8,000 in the bank and just use part of the interest to pay for the extra fuel!

Comfort & Posterity

The math is great to do and impressive, but comfort and looks are important parts of the equation. Who wants to sit in a drafty house and be miserable. Besides, new windows will enhance the value of your house. So, if you are planning to sell your home (the average family moves every seven years!), then your house will show much better.

The point is this. If you are going to jump in and make the purchase, let's be sure you buy the best money can buy. This is one way to preserve and protect your capital.

Style & Character

One of your biggest challenges in selecting new windows will be to stay in character with your house. The aluminum / vinyl combination windows will help you do this. The aluminum exteriors provide you with infinite exterior color possibilities. This is extremely important if you want to maintain a high value for your house. Don't forget, some vinyl windows can actually detract - or steal - value from your house. Beware of the slick sales presentations by the crooks. They will skirt this issue by making you focus on energy savings and such. Energy is important, but we have already seen from the math that it is not as important as the salespeople would like you to believe.Look at Options

While you are shopping for your vinyl windows, pay attention to the new options and features. Test the motion of sliding windows. Note how easily the vinyl / aluminum windows move. The difference is striking.

Glass... I can't say enough about glass. It is - in many respects - the most important part of the window. You want the best high performance glass you can afford. This will be soft coat Low-E or one with high performance Low-E film in between the panes of glass.

The Low-E films and coatings work hard to reflect heat back to its source. This means savings in both winter and summer months.

Inquire about the air infiltration performance of the windows. This value is given as how many cubic feet of air per minute leak past the window per lineal inch or foot of weather-stripping or crack. It is an important number as the greatest heat loss is caused by air infiltration leaks!

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Vinyl Windows Guidelines

10 Purchasing Guidelines When Shopping for Vinyl Windows

Certification

This is the most important point. Your windows MUST carry the ANSI-AAMA 101-93 certification. If they don't they are also rans. You must have proof from the manufacturer that this is so. All that pass will have a letter of certification. Don't believe VERBAL promises from salespeople!

Installers

Who will install your windows? Company employees or sub-contractors? Sub-contractors can have a different attitude. Speed = more $. Bad ones have no insurance. No matter who installs the windows, get a copy of the paid in advance Workman's Compensation Premium or Certificate!

"Tonight Only" or Immediate Discounts

If your salesperson says that he is "...authorized to give you this 'significant' discount - but only if you sign tonight...", WATCH OUT! This is a high pressure close technique. It is a danger signal that the price of the windows is over inflated.

Broken Glass

What happens if a window breaks in 5 years? If you buy a window where you have to get a new vinyl sash WITH the new glass, this can be trouble. The window company may go out of business. The vinyl may not match in color!

Energy Performance

This is an over used term. The bottom line here is: What is the OVERALL R- factor of the window? The frame may be great but the glass poor. Or the glass may be the best soft coat Low-E available, but the weather-stripping is useless. Ask and obtain specific air infiltration numbers!

Guaranteed Utility Bill Savings

Does the sales presentation come with a utility bill savings guarantee? If so, read it carefully and compare prices. The savings guarantee may not be that much when you really do the computation. In fact, you and all other people who buy those windows are paying for this pledge with higher window pricing........

Low-E Glass

This is an absolute must. Low E glass will save you vast sums of money compared to regular glass. Look for soft coat Low-E glass or one with Low-E films between the glass panes.

Warm Edge Technology

This is a fancy new term. All it really means is the spacer between the pieces of glass transmits cold slower to the inside piece of glass. Aluminum is old technology. Ask about the new coated steel and other warm edge spacers.

Condensation Guarantees

If you get a guarantee against condensation, WATCH OUT! There is a great chance that your new windows WILL fog! If you get new high quality windows, I guarantee that your indoor humidity WILL soar! This can cause some condensation.

Written Contracts / Deposits

Everything that you are buying and are promised MUST be in writing. Watch out for excessive deposits. A 25% deposit for custom ordered windows at the contract signing is not unreasonable. Another check for 25% more is OK when they are delivered. DON'T pay the remaining 50% until you are completely satisfied! Put this pay schedule in the contract.

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Manufacturers of Vinyl / Aluminum Combination Windows

Manufacturers of Vinyl / Aluminum Combination Windows

I wrote a column about vinyl windows back in 1995. Manufacturers of vinyl windows at that time were held to standards of ANSI-AAMA 101-93 certified windows. That window certification standard has now been changed to AAMA/NWWDA 101/I.S.2-97. There must have been 100 plus companies across the USA that made vinyl windows meeting this standard. The field was narrowed considerably once another factor was thrown in. When you look for aluminum / vinyl combination window manufacturers, you only find two!

Both make what appears to be an excellent product. The Traco window, I know for a fact, is AAMA/NWWDA 101/I.S.2-97 certified. I believe the Sugarcreek Industries window is certified as well. You will have to check for yourself for BOTH if you decide to buy. Remember, a company can lose this certification if their quality falls off. The AAMA/NWWDA people come and take random windows for testing purposes at their discretion.

These two window companies seem to have significant distribution east of the Mississippi River. You need to contact them and ask for product literature AND the locations of distributors / installers in your area. It is the easiest way to do it. Do NOT call random companies in your yellow pages. If you contact a dishonest company, they may lie to you and pull the famous bait and switch scheme.

  • Sugarcreek Industries, Inc.
    425 South Broadway Street
    Sugarcreek, Ohio 44681

  • Traco
    71 Progress Avenue
    Cranberry, Pennsylvania 16066

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Storing and Installing Wood Windows

Storing and Installing Wood Windows

Wood windows are sensitive products. If you treat them roughly you can damage them. They may rack out of square. Weatherstripping that fit tightly at the factory can shift out of place creating drafts. In other words, make sure your contractor takes care when installing the beasts.

Always store windows in a well ventilated space. Cover them to keep them dry and clean. Beg your contractors to handle them with soft, clean cotton gloves. Oil and dirt from hands can cause blemishes when the painter shows up 2 or 3 months from now with stain and urethane!

ALWAYS install the windows exactly according to the written instructions provided by the manufacturer. It takes only 5 to 10 minutes to read these. Windows MUST be installed level and plumb.

Wood windows must also be square after they are installed. This is easy to check. Simply take a tape measure and check the diagonal measurements (upper left corner to lower right corner - upper right corner to lower left corner) of the outer frame that projects beyond the rough framing inside the house. The measurements should be exact or within 1/8th inch.

Flashing details and shimming windows is critical. Shims need to be placed under the outer side jambs and/or where two windows are mulled together. The weight of the sashes and frames is concentrated at these points. Windows with built-in nailing flanges and flashings need to be installed so the top flange slides under a house wrap or felt paper. This will require you to make a precise slice in a water barrier. Tape the slice when finished.

The sides and bottom of the window must also be flashed. The flashing order resembles that of a chimney going up a roof. The bottom flashing work is done first and then the sides. The side flashings overlap the bottom flashing. Finally the top flashing is done and it overlaps the side flashings. This allows gravity to pull the water over the overlapping flashings, not under them.

Related Articles:  Wood Windows, NWWDA Certified Windows, Certified NWWDA Manufacturers, Buy Certified Wood Windows

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Buy Certified Wood Windows

Certified divers, financial planners, life underwriters, kitchen designers, and so on and so on... It just makes good sense that wood windows should join the club! Thank goodness! Shopping for wood windows you can quickly confound the most organized and logical person.

Tough Standards

The National Wood Window and Door Association's (NWWDA) Hallmark Certification program is not a walk through the park. First the manufacturers have to go the extra mile and build a quality product. They have to test it themselves to assure they meet the minimum standards. Unannounced periodic inspections by the testing labs are a reality. In other words, the certification program is real. The net result is that you can purchase a window that has proven performance.

Slick Salespeople

Watch out when you go window shopping. There is a bountiful supply of polished sales people who can sometimes speak with a forked tongue. They may downplay the importance of certification. They may make excuses that the testing is too expensive. Don't believe them.

The windows you are about to purchase are one of the most important aspects of your home. They are the weakest link in the energy chain that connects your interior comfort from the extremes of weather just inches away. The NWWDA Hallmark certification program and other certification programs like the National Fenestration Rating Council's (NFRC) thermal performance standards help you to quickly segregate the winners from the losers. If you can't find the proper labels with the best performance values, then keep shopping.

Invisible Protection

Did you know that several wood window manufacturers also treat the wood used in the windows with a special water repellent preservative? This is a great feature for windows that might not get the long term care and attention they deserve once they are installed. The NWWDA also has a very stringent test for these products as well. Those manufacturers who currently incorporate a certified water repellent preservative in their windows are:

  • Andersen Corporation
  • BiltBest Windows
  • Eagle Window & Door
  • Kolbe & Kolbe
  • Malta Windows
  • Marvin Windows & Doors
  • Norco Windows
  • SealRite Windows
  • SNE Enterprises Inc.
  • Sun Windows

Some other manufacturers may include a water repellent but it may be a lower quality product. Or for some reason, they decide not to subject their windows or the water repellent to the NWWDA for testing. If you want piece of mind, then I suggest you go with one of the listed companies.

Be aware that the list can grow and shrink depending upon who decides to join and abandon the program. If a manufacturer or salesperson says they are certified in one way or another, then make them prove it to you in writing. If they don't do this or produce promises that evaporate into thin air, then walk. The proof should be a copy of the letter they received from the certifying body like AAMA or the NFRC.

Related Articles:  Wood Windows, NWWDA Certified Windows, Certified NWWDA Manufacturers, Storing & Installing Wood Windows

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Certified NWWDA Wood Window Manufacturers

Hallmark Certified NWWDA Wood Window Manufacturers

There are a minimum of 67 wood window manufacturers in the United States. That is how many I have been able to identify over the years. Would you believe that of these 67 manufacturers only 10 of them (at the time this was authored) have taken the initiative to have all and/or a portion of their product line certified under the new NWWDA Hallmark Certification program!

In fact, when you review the list below of the 10 manufacturers who have gone the extra mile, you will be shocked at some of the big name manufacturers who are missing from the list! My take on this is that they manufactures feel the certification is not worth it or the power of their brand will get them through a sales presentation. They may be right, but as time goes on, more and more people demand quality.

Windows and doors are probably one of the most important aspects of your home when it comes to comfort, energy savings, and performance. You should absolutely invest as much money as possible in your windows and doors.

You want ones that will save you money over time. I recommend that you check out the windows made by the companies below. If you aren't satisfied and you decide to go with a company that is not listed, don't blame me if you have a problem at a later date.

  • Andersen Corporation

  • Eagle Windows/Doors
  • Kolbe & Kolbe
  • Malta Windows
  • Marvin Windows/Doors
  • Norco Windows
  • Sealrite Windows
  • SNE Enterprises
  • Sun Windows Inc.

Related Articles:  Wood Windows, NWWDA Certified Windows, Buy Certified Wood Windows, Storing & Installing Wood Windows

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NWWDA Hallmark Certified Wood Windows

100 ... Oooooops! I Meant 1,000 Plus Certified Wood Windows

I was aiming to deliver to you 100 wood windows that carry the NWWDA Hallmark Certification. Guess what? There are actually well over 1,000 available and more will be available each month as more manufacturers see that they must participate in this program to remain competitive.

Some of the manufacturers only have a portion of their windows certified. Others have their entire product line certified. For example, BiltBest has only one portion of its line certified. It is the Spirit Clad and Wood Casement Windows Product category. There are a total of 91 windows in different sizes just from this single manufacturer.

Certain manufacturers - believe it or not - did not respond to my requests for a listing of their products that are certified. I hope you don't run into the same difficulties when you call them!

Here is a partial list of NWWDA Hallmark Certified Wood Windows:


Andersen Corporation

Their marketing manager called me and said that every single wood window in their product line carries the certification. I opened my most recent Andersen Window catalog and lost count at 314 windows...... I know there are more! You can call Andersen for a full line catalog or visit one of the hundreds of distributors across the nation.


BiltBest Windows

At this time, just the Spirit Clad and Wood Casement Windows are certified. These include roundtop units and transom windows. There are a total of 91 windows with this manufacturer.


Eagle Windows & Doors

Several of Eagle's product lines are certified. they are as follows:

  • Aluminum Clad Wood Casement Vent
  • Aluminum Clad Wood Casement Picture
  • Aluminum Clad Wood Tilt-in Vent Double Hung
  • Aluminum Clad Wood Fixed Double Hung

I was not able to get a quantity count, but I suspect that they have a minimum of 125 wood window products in these combined lines.


Kolbe & Kolbe

These people supplied me with information that stated that a portion of their product line is certified. Here is what they told me:

  • Clad Magnum Casements
  • Wood Magnum Casements
  • Clad Magnum Double Hungs
  • Wood Magnum Double Hungs
  • Wood Magnum Tilt-Turn
  • Wood Magnum Hopper
  • Casement Single Sash
  • Traditional Double Hung
  • Royal Double Hung

Marvin Windows

I was told by a Marvin executive that a majority of their entire wood window product line is Hallmark certified. This represents possibly well over 500-750 wood window products. If you operate under the assumption that they will incorporate the same quality in their custom made windows - then they offer an infinite amount of certified products! Marvin will make any window you want. They have made many custom window units for me.

Here is a listing of the Marvin Window categories that are certified:

  • Wood Casemaster
  • Wood Awning
  • Wood Double Hung
  • Wood Glider
  • Wood Round Top
  • Wood Polygon
  • Clad Casemaster
  • Clad Awning
  • Clad Double Hung
  • Clad Glider
  • Clad Round Top
  • Clad Polygon
  • Wood Magnum Double Hung
  • Wood Magnum Historical Double Hung
  • Wood Magnum Single Hung
  • Wood Magnum Tilt-Turn
  • Wood Magnum Hopper
  • Clad Magnum Double Hung
  • Clad Magnum Tilt Turn
  • Clad Magnum Hopper

Sun Windows

Sun Windows offers a huge variety of certified products. They are located in western Kentucky and distribute all over the nation. The following lines are certified:

  • Clad Wood Double Hungs
  • Clad Wood Casements
  • Clad Stationary Units

The Clad Stationary Unit category includes hundreds of windows - fixed picture windows, circle tops, octagons, etc.


Malta, Norco, Sealrite, and SNE did not respond to my request for certified products.

Related Articles:  Wood Windows, Certified NWWDA Manufacturers, Buy Certified Wood Windows, Storing & Installing Wood Windows

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Vinyl Windows – Purchasing Quality

Vinyl Windows - Buy Quality

Cold drafts in the winter from windows are really an uncomfortable feeling. The drafts can be direct air leaks caused by inferior weather-stripping and/or old technology glass. Believe it or not, you can buy brand new vinyl windows today in your town that have both! The sales presentations are often slick and some of the claims made by the salespeople are not always the complete truth. So how do you buy a quality vinyl window? It is not as hard as you may think.

Ingredients are Important

Every part of a vinyl window contributes to its performance. If you want the actual vinyl to not fade and crack, then you better get vinyl that has the best titanium dioxide in it. This chemical blocks and absorbs ultraviolet (UV) radiation.

Glass is glass, right? No way! Insulated glass has come light years from its inception. First we had standard insulated glass, then hard coat Low E, then soft coat Low E, and now Low E with invisible heat films.

The two pieces of glass are actually separated with a spacer that can directly affect inner glass temperatures. Old spacers were made with aluminum. Aluminum quickly conducts heat and cold. This is bad. New steel and plastic glass spacers slow down energy transfer. This is good!

The actual vinyl window frame and sash components vary in type and efficiency. Some windows have minimal chambers, others have lots of individual chambers. Some are hollow, others are foam filled.

How do you keep all of these parts straight in your mind? How will you know if you are getting a bad deal?

Vinyl Windows - Independent Testing

There are always good manufacturers in every product category. These are the ones who want to make a good product and strive for perfection and supplying great value to us, the consumer.

The vinyl window industry is no different. Because quality can vary from very poor to excellent, the good manufacturers banded together years ago to develop testing standards that allow high quality to be quantitatively measured.

There are three testing organizations. All of the testing standards are very technical - so much so that the average person can't begin to understand the testing methods and raw numbers that result from the test procedures. That is what engineers go to school for. Once the test data is refined and charted, it begins to make sense to us common folk.

The three testing organizations are: AAMA - NWWDA (American Architectural Manufacturers Association - Window & Door Manufacturers Association), NFRC (National Fenestration Rating Council) and Energy Star. If a vinyl window company goes to the effort to get tested by any one of these organizations, it is "trying harder." If it passes the tests, it is a great accomplishment. Suffice it to say that if you can find a vinyl window company that sells windows that have passed any or all of these standards,you have a great product. If you are looking for windows that save the most energy, then look for windows that are NFRC or Energy Star certified.

Related Articles:  Vinyl Windows Certification, Window Glass Performance Comparisons, Energy Star Windows, Window Installation,

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