U-Factor (U-Value) and R-values
U-factor and R-rating both reflect the insulating degree of replacement windows. A lower U-factor corresponds to better-insulating windows. The R-ratings are the inverse of the U-factor. Both U-factors and R-ratings can be given for either full frame or center of glass (COG). It is important to only focus on full frame numbers since the weakest insulation area of a window is the frame. A standard, single-pane window has an R-rating of 1 (U-factor of 1), and a clear glass, dual-pane window has an R-rating of 2 (U-factor of 0.5). Super energy efficient high performance replacement windows with low-e coatings, triple pane glass or suspended film technology with inert gases between the layers of glass will show R-ratings between 5 and 11 (U-factors between 0.22 and 0.09).
Solar Heat Gain Coefficient (SHGC)
Solar Heat Gain Coefficient (SHGC) measures how well the replacement window blocks heat from the sun. SHGC is expressed as a number between 0 and 1. The lower the SHGC, the better a product is at blocking unwanted heat gain. Blocking solar heat gain is particularly important during the summer cooling season.
Installing windows with high SHGC in your home where they receive direct sunlight in the winter, but are shaded in the summer allows the sun to passively heat your home in the winter without overheating in the summer. Prospective buyers of replacement windows should look for product lines that offer both high and low SHGCs. Ask our R-5 replacement windows sales rep which SHGC is best for your home. Keep in mind, leaves fall from the trees in fall thus allowing direct winter sun, however where your home is, it may be in full shade due to foliage and the homes directional orientation.
Visible Transmittance
VT refers to the degree of visible light in the light spectrum that replacement windows let in. VT is a measurement between 0 and 1. A high VT score indicates a window that allows a large amount of daylight into a room. High-performance windows feature VT ranging from 0.28 to 0.64. When evaluating replacement windows in terms of VT is low-E coatings that achieve low SHGC often lower the VT as well. So, look for a good balance between high VT and low SHGC. Your local R5 high performance replacement windows sales rep will be able to help with this decision.
Air Leakage
Measures how much outside air comes into a home or building through the replacement windows. AL rates typically fall in a range between 0.1 and 0.3. The lower the AL, the better a product is at keeping air (and water) out. AL is an optional rating, and manufacturers can choose not to include it on their labels. This label displays AL in U.S. units. Labels on products sold in markets outside the United States may display AL in metric units.
Condensation Resistance
CR is a rating system that evaluates the tendency for replacement windows to resist the condensation on the replacement windows inner surface. The CR potential of a high performance window is measured by a score between 0 and 100, higher numbers corresponding to a better product. Condensation on the interior surfaces of replacement windows can obscure visibility, contribute to the growth of and cause damage to the glass, sash or master frame. The CR rating of replacement windows depends both on the frame type and the glazing method. Windows with aluminum frames and clear glass perform in the lowest range (12-42), with low-e coatings and vinyl or composite frames performance range improves (49-69).
When shopping for the most energy efficient replacement windows only consider R5 high performance replacement windows. Also consider your homes particularities such as the homes directional orientation and climate, then select replacement windows that offers the best combination of the above factors for thermal efficiency and money savings.
“The bitterness of poor quality remains long after the sweetness of low price is forgotten” ...Benjamin Franklin
It is NOT a Luxury
Home energy savings and comfort should be a natural for all of us, just like radial tires. Maybe because we are surrounded by so much glass we never think about it or maybe we don't care enough about it. Is that the answer? Or is it that cheap hallow vinyl double glass replacement windows and R5 high performance replacement windows look alike from ten feet away? When buying replacement windows for your home, lowest priced retail replacement window outlets is the last place you want to be seen at?
It is NOT a luxury to save gas, oil or electricity, it is a necessity.
It is NOT a luxury to increase our homes comfort level.
It is NOT a luxury to be safer in your own home.
It is NOT a luxury to have lower monthly energy bills.
It is NOT a luxury to be able to clean your windows safely.
It is NOT a luxury to have child safety locks, ...that's a necessity.
It is NOT a luxury to have your furniture and drapes not fade or get brittle.
It is NOT a luxury to sit near an air tight window, ...do your walls move?
It is NOT a luxury to keep out 93% of harmful Ultra-Violet light.
It is NOT a luxury to use the Sun's Infra-Red light to help warm our homes.
AND
It is NOT A Luxury
...that your homes Heating and Air Conditioning systems will get many added years of longevity because they will both be working so much less.
Owning R5 high performance replacement windows is a real necessity. We wish there was a home in every community in America with triple pane windows where a homeowner could spend a day and a night. Don't laugh until you have had this experience because it will most certainly change your mind. The comfort level you begin to experience in your own home creates an enviornment you' ll never live without again.
Just think of how many homes are built near highways, freeways, train passings, airports or just busy roads.
What do we do!! We build sound barriers costing millions of dollars per mile. Sound abatement is a major issue for many Americas since 70% of us live in or near a major metropolitan location.
The R5 Window and what you will experience
The optimum thickness of a triple glass IG unit is 1 (one) inch, with 3 (three) pane of glass. Two layers each of soft-coat Low-E2, on two glass surfaces, with "edge-delete" warm edge window glazing spacer technology. Re-enforced master frames and sashes, welded sashes, interior snap-in glazing beads and NOT attached to the lift rail in any way.
Both sashes on double hung replacement windows should have handles top and bottom including a infant child* night safety latch and half screens made of a memory fiber that is also NON conductive. Quality replacement windows also use block-n-tackle balance system for raising and lowering the double hung window sashes, a deep top pocketed cavity for the top sash to fit into securely. Spring tension Wind Jammer technology on the sides on both sashes including a full inter-lock at the meeting rail that goes master frame to master frame with NO fuzz plugs. All IG units to be filled with argon or krypton gas (maybe even Xeon gas however this is very expensive).
This is a triple pane replacement window product that will not only save energy and money but will also give your home the living comfort you never imagined while changing your life forever. If this sounds silly, that a replacement window can do so much, ...think of how American Indians felt when they move from a tepee into a hardened structure.
* This safety latch will only help prevent an infant from opening a double hung or slider window. Also known as a ventilation latch. Allowing homeowners to open a double hung or slider windows about two and half inches and still be secure.