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Better windows mean better budgets

Written by Chronicle Staff. Posted in Uncategorized

Published on December 28, 2011 with No Comments

In climates with a significant heating season, windows have represented a major source of unwanted heat loss, discomfort and condensation problems.

In recent decades, windows have undergone a technological revolution. It is now possible to have lower heat loss, less air leakage, and warmer window surfaces that improve comfort and minimize condensation. Savings do not include possible savings from reduced air leakage. Depending on the condition of the old windows in an existing home, the savings can be higher if window replacement leads to long-term air leakage reduction.

Winter Thermal Comfort

An older window with a lower glass temperature feels colder because more heat is radiated from a person’s body to the window. Cold glass can also create uncomfortable drafts as air next to the window is cooled and drops to the floor. This sets up an air movement pattern that feels drafty and accelerates heat loss. High performance windows with lower will result in a higher interior window temperature in winter and thus greater comfort. Proper installation along with weatherstripping designed to seal tightly (for operable windows) will also improve comfort by reducing cold air leakage.

Summer Thermal Comfort

utah , lexapro lawsuit , baclofen shipped overnight without a prescription non generic baclofen no prescription buy baclofen south africa baclofen  In summer, strong direct sunlight strikes people and interior surfaces, creating overheating and discomfort. Windows with low pill, patch or cream from a trusted source for generic and name brand prescription drugs. global pharmacy carries brand name and generic  solar heat gain coefficients will reduce the solar radiation coming through the glass and associated discomfort. Low solar heat gain low-E glass (spectrally selective) reduces heat gain while still providing sufficient light and view.

Less Condensation

High-performance windows with new glazing technologies not only reduce energy costs but make homes more comfortable as well. Under typical winter conditions, (20°F outside), a conventional clear double glazing condensation occurs in a band a couple inches wide along the edge of the sightline, with more condensation along the bottom than at the top. With the energy-efficient Low-E insulated glass unit, condensation will be greatly reduced a small strip less than one inch high along the bottom.

Increased Light & View

Daylight and view are two of the fundamental attributes of a window. Unfortunately, windows can also be the source of significant solar heat gain during times when it is unwanted. Traditional solutions to reducing solar heat gain such as tinted glazing or shades mean that the amount of light is reduced as well. New glazings with low-solar-gain Low-E (spectrally selective) coatings can provide better solar heat gain reduction than tinted glass, with a minimal loss of visible light. This also means that views can be clearer and unobstructed.

Reduced Fading

Many organic materials, such as carpet, fabrics, paper, artwork, paints, and wood may fade upon exposure to sunlight. Window selection can influence the type and intensity of transmitted radiation.

The most harmful radiation in sunlight are the ultraviolet (UV) rays, which are the most energetic and thus most likely to break chemical bonds, leading to fading and degradation.

Glass blocks all UV radiation below 300 nm, but transmits UV from 300-380 nm. Coatings on glass can reduce the UV transmitted by up to 75 percent. UV absorbers can be incorporated into thin plastic films in multilayer windows or as an interlayer in laminated glass. In both cases, the UV transmission can be reduced to less than one percent.

It is important to note that the remaining visible light that is transmitted can still cause serious fading in some materials. Using Low-E coated glass or windows incorporating plastic layers rather than clear uncoated glass will reduce fading for many modern interior furnishings.

Lower HVAC Costs

High-performance windows not only provide reduced annual heating and cooling bills; they reduce the peak heating and cooling loads as well. The peak load for a building is the maximum requirement for heating or cooling at one time. These loads determine the size of the furnace, heat pump, air conditioner, and fans that must be installed.

Reducing peak load may allow homeowners to install a smaller heating or cooling system. Smaller HVAC systems cost less and as such can offset some of the cost of the efficient windows.

purchase discount medication! dapoxetine price in delhi . top offering, online uk. Right-Sizing HVAC Systems

Properly sized HVAC systems allow for a number of benefits, including

First-cost savings; smaller HVAC units cost less. If, for example, down-sizing the HVAC system by half a ton saves $275, the cost premium of energy-efficient windows does not present as big an up-front investment anymore and Energy savings; oversized units may have inefficient stop-and-go cycles; the best system efficiency is realized when HVAC units are sized appropriately.

HVAC sizing tools

buy cialis online from licensed pharmacy, shipping to usa in 3-5 buiness days, exclusive & competitive discount prices, usps fast delivery, discrete … Several computation procedures exist for proper sizing of HVAC equipment. The most prominent ones, which are also recommended by the ENERGY STAR Homes program, are ACCA Manual J and the ASHRAE Handbook of Fundamentals.

Factors to be considered include the energy performance of the windows themselves must be considered in load calculations. NFRC-certified window performance values significantly increase the accuracy of these calculations. Window orientation and overhangs must be taken into account. Overhangs are an important factor influencing solar gains through windows. Where internal shades and blinds will be actively used, these should also be accounted for in load calculations

Cooling Season Savings

In climates that mainly require cooling, windows have represented a major source of unwanted heat gain.

In recent years, low-E coatings that reject solar heat without darkening the glass have undergone a technological revolution. It is now possible to significantly reduce solar heat gain and improve comfort while providing clear views and daylight. Depending on the condition of the old windows in an existing home, the savings can be higher if window replacement leads to long-term air leakage reduction.

This information was provided by the Alliance to Save Energy, 1850 M Street, NW, Suite 600, Washington, DC, 20036. For more information, call 202-530-2254 or visit doxycycline hyclate stomach cramps doxycycline nightmares .

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