STYLES • SPECIFICATIONS • PHOTOS

WINDOWS SPECIFICATIONS

Specifications/Performance Since windows are 90% glass it is probably the most important part of any new window. Today glass is used to provide many benefits not available just 10 years ago.
Insulation Value Solar Gain Control Ultra Violet Ray Protection Noise Control
Insulation The R-Value determines the insulating performance of a window. R-Value stands for resistance to heat flow. In the winter you don't want your heat to flow out of your house and in the summer you don't want the heat to flow in. Simply put the higher the R-Value, the better the fuel savings and home comfort.
If you currently have single pane windows with storms or double pane windows more than ten years old, you probably have R-2.0 glass. Comparing this to today's high efficiency glass with LOF Energy Advantage Low-E. Combining Low E with Triple pane and argon gas yields an R-Value of 5.88. When we substitute Krypton Gas for Argon, the R-Value rises to R-7.85. This makes today's glass nearly 400% more efficient. With improved efficiency like this, it's easy to see how new windows will pay for themselves over time.
Glazing Performance Comparison PERFORMANCE CLEAR CLEAR INSULATING CLEAR W/CLEAR STORM SASH CLEAR W/ENERGY ADVANTAGE LOW-E STORM SASH ENERGY ADVANTAGE LOW-E INSULATING CLEAR INSULATING W/ENERGY ADVANTAGE LOW-E SASH LOW-E INSULATING W/ENERGY ADVANTAGE LOW-E SASH GLASS U-VALUE (WINTER)1 Air-filled Argon-filled 1.12 0.49 0.51 0.36 0.34 0.29 0.25 0.19 0.17 GLASS R-VALUE (WINTER)1 Air-filled Argon-filled 0.89 2.04 1.96 2.78 2.94 3.45 4.00 5.26 5.88 SHADING COEFFICIENT 1.01 0.91 0.91 0.76 0.84 0.70 0.67 VISIBLE LIGHT TRANSMITTANCE 90% 82% 82% 76% 76% 69% 64% UV TRANSMITTANCE 74% 60% 60% 48% 48% 40% 32% CONDENSATION RESISTANCE FACTOR2 Air-filled Argon-filled 23 63 63 75 75 79 81 85 87 INSIDE NIGHTTIME SURFACE TEMPERATURE Air-filled Argon-filled 17oF 45oF 45oF 51oF 53oF 55oF 57oF 60oF 61oF NOTES: Performance figures are based on 3/32" glass, 1/2" space for insulating glass unit and 1 1/4" for storm sash spacing. All performance values per LBL Window 4.1. All U-values are center of glass values. 1Winter U- and R- values are based on an outdoor temperature of 0oF (-18oC), an indoor temperature of 70oF (21oC), and a 15 mph (24kph) wind velocity with no sun. 2CRF value is inside center of glass surface temperature - higher value means less condensation.
Solar Gain Control Many Manufacturers of windows produce "one" product and sell it Nationwide. Unlike these Manufactures we install windows designed specifically for Michigan and Northern Indiana. Because this region spends more time heating than cooling, the glass design is more specific to trapping heat in the winter months. If you live in Florida your glass design should be more specific to keeping the hot sun out.
Winter In the winter, Energy Advantage Low-E Glass is designed to work in two ways: First, it transmits the sun's short-wave energy. This means it allows the sun's energy (which provides visible light and invisible heat) in through the windows, which helps heat a home in winter. Second, once the sun's heat is inside a home, the coating works to reduce the amount of heat transferred through the glass to the colder exterior. As a result, less of this heat, as well as the heat produced by a furnace, is transmitted back through the glass to the outside, helping to reduce heating bills in winter.
Heating Season Energy Performance The energy efficiency of residential windows can be evaluated by the conductive heat loss through the glazing unit and window frame (U-value), the beneficial solar heat gain through the glass (Solar Heat Gain Coefficient) and the air infiltration losses around the perimeter of the window. It is important to recognize that all three factors should be taken into account when determining the overall heat flow through a window unit. For example, the overall window U-value measure, taken alone, only indicates the conductive heat loss of the window, without taking into account the positive solar heat gain for that window, as measured by the Solar Heat Gain Coefficient. Therefore, a sum total of the energy flows through the window during the heating season would be simply the summation of the conductive heat loss through the window (negative value) plus the solar heat gain (positive value). Examples of residential windows glazed with glass options which include both pyrolytic low-E and soft coat low-E products are shown in the chart. For reference, the option of glazing the window, openings with clear monolithic glass, a clear insulation glass unit, and an R 19 opaque window would be equivalent to two plywood sheets filled with approximately six inches of fiberglass insulation. The U-value and corresponding conductive heat loss (in kBtu) are slightly lower for a sputtered (soft) coated low-E glass window unit. However, LOF Energy Advantage Low-E Glass will allow more of the solar heat gain(in kBtu) through the glazing unit as noted by the Solar Heat Gain Coefficient. LOF Energy Advantage Low-E Glass window units will have the "lowest" net heat loss value of all the products noted in the table.
Heating Season Energy Performance PRODUCT (Coating Surface) OVERALL WINDOW VALUES CONDUCTIVE HEAT LOSS (kBtu) SOLAR HEAT GAIN (kBtu) NET HEAT LOSS (kBtu) U-VALUE (WINTER) SOLAR HEAT GAIN COEFE. LOF ENERGY ADVANTAGE LOW-E GLASS (#3) 0.31 0.51 -10,541 9,547 -967 R 19 OPAQUE WINDOW 0.05 0 -1,790 0 -1,790 STANDARD SOFT COAT LOW-E2 (#3) 0.30 0.44 -10,201 8,005 -2,196 STANDARD SOFT COAT LOW-E2 (#2) 0.30 0.39 -10,201 6,808 -3,393 LOW SOLAR SOFT COAT LOW-E3 (#2) 0.28 0.30 -9,521 4,773 -4,748 CLEAR/CLEAR I.G. 0.89 0.71 -30,263 16,563 -13,700 CLEAR MONOLITHIC 1.30 0.79 -44,204 22,775 -21,429 NOTES: 1Units: kBtu = 1000 Btu Ranch house in Madison, WI with 1540 square foot (ft2) of floor area and a 10% window/floor ratio. Total of 154 ft2 of window area with 38.5 ft2 of window area per elevation. Energy analysis program - RESFEN (Version 2.4) with window air infiltration = 0.10 ft3/min./linear ft. Low-E Insulating Glass Units: 3/4" overall with two lights of 1/8" glass and a 1/2" argon-filled cavity with a butyl-metal spacer. Window frame material is vinyl with a U-value = 0.30 Btu/(hr - ft2 - oF). Heating Degree Days (HDD 70 oF) = 9200 oF-day 2PPG Sungate 100 3Cardinal LOE2-72
Better Than an R 19 Opaque Window ! The selection of windows with LOF Energy Advantage Low-E Glass will result in "lower" winter heating costs than if the window Openings were glazed with an R 19 opaque window.
Summer In the summer, heat enters a house through ordinary clear glass to the cooler interior. This happens in two ways: first, through direct short-wave sunlight; and second, by long-wave radiation generated by sidewalks, driveways, and other elements which have absorbed heat from the sun. Energy Advantage Low-E Glass effectively reduced this unwanted radiant heat gain by reflecting a significant portion of long-wave radiation back to the outside, helping to keep homes cooler and reduce cooling costs in summer.
Ultra-Violet Protection
UV Radiation is thought to be increasing as a result of the depletion of the earth's ozone layer. This UV Radiation is also thought to increase our risk of skin cancer and is known to cause carpets, drapes, and furniture to fade. Reducing UV Radiation in your home is not only healthy, but will make your carpet, drapes, and furniture look better longer. LOF Energy advantage glass reduces UV transmission by 68% (See Chart A).
Noise Control The world is louder and busier than ever. By the end of the day we all want a place to retreat for 10 minutes of peace and quiet. A place to escape the noise and chaos of everyday life. The Double and Triple Pane windows we offer combined with Low E, Argon and Krypton can reduce outside noise transmission by 40%.