About Window Medics Plus

Window Defogging FAQs





Q: What is an “IGU?”
A: IGU stands for Insulated Glass Unit. An IGU, double pane or thermal pane window is composed of 2 pieces of glass separated by a spacer bar, which creates a sealed air space between the two panes. Thermal pane windows are manufactured as airtight units that resist fogging due to desiccant in the spacer. It's the dry air space that creates the insulating properties that makes these units so energy efficient. The size of the air-space determines how efficient the window will be. A window with a 3/4" air-space will be more thermally insulating than one with a 1/4" air space. Other factors like Low-E or tinted glass can also increase energy efficiency.

Q: Why have my double pane windows failed?
A: All sealed double or thermal pane windows eventually fail. An average life span of a quality wood window is 20-25 years if painted and caulked every 2-4 years. Expect shorter life spans for aluminum and vinyl windows. There is no such thing as a window that will last a “lifetime.” That is simply a marketing gimmick used by window replacement companies. The "Lifetime" warranty doesn't transfer if the house is sold. The degree of exposure to sun and rain a window gets will determine its lifetime. Windows facing south or west will not last as long a windows facing north that do not get direct sunshine.

Q: What is safety glass and why do I need it? ?
A: "Safety glass" or “tempered glass” is glass that when broken breaks into very tiny pieces in order to minimize injury. Auto glass is tempered glass for instance. Standard glass can be deadly due to the large sharp spear-like pieces that are created when it breaks. The most common types of safety glass are Tempered, Laminated, Acrylic and Polycarbonate. Uniform building codes exist for specific applications for residential and commercial buildings to insure safety. Windows Medics Plus installs the required building codes in order to reduce your risk of harm or liability.

Q: What is Laminated glass?
A: Laminated glass is a form of Safety Glass created by sandwiching a layer of Polyvinyl Butyral (PVB) between two pieces of glass. It is then heated and pressurized to firmly adhere the glass to the inner layer. Laminated glass is used in all vehicle windshields. When broken, the glass is held in place by the inner PVB layer and provides a high level of both safety and security.

Q: What is Tempered glass?
A: Tempered glass is a form of Safety Glass created by heating regular annealed glass then chilling it quickly to create an inner tension in the glass. This tension produces glass this is about four to eight times stronger than annealed glass. However, when it does breaks, it breaks into small pea sized pieces than eliminate the deep wounding cuts caused by regular annealed glass. Tempered glass also withstands higher temperatures and quick temperature changes.

Q: Are all double pane/insulated windows filled with gas or Argon?
A: No. Most dual pane windows are simply filled with plain air. This provides a dry sealed air space which reduces heat transfer. Argon gas is less conductive than air and nitrogen and in extremely cold climates can result in a noticeable difference in heat transfer.

Q:What is Low-E and what does it to for my windows?
A: Low-E stands for Low-Emittance. Low-E coatings are invisible, microscopically thin metallic oxide layers deposited on an inner window or skylight surface primarily to reduce radiative heat transfer entering or exiting the window. Low-E can reduce the heat transfer in a window by up to 60% over a non Low-E window. The difference can be often be felt by warmer rooms in the winter and easier to cool homes in the summer.

Q: Is it possible to repair a failed foggy window without taking out the entire frame?
A: Absolutely. Many people don’t know the difference between Window Replacement and Glass Replacement. Window Replacement is replacing the entire window, frames and all, down to the rough openings. Glass Replacement leaves the frames intact and only involves replacing the glass (IGU) part of the window. All window frames from wood, aluminum or vinyl are designed so that the glass units can easily be removed and replaced without removing the frames. .

Q: How long does it take to get my foggy windows fixed?
A: From the time we order your new glass units to the day we install them is typically one to two weeks.




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