Replacement Window FAQ's Categories



  Window Pricing & Estimates  

 

  Replacement Window Basics  

Why should I be concerned about windows?

Windows can be responsible for unnecessary heat loss, high-energy consumption, cold drafts and may contribute to condensation problems within homes. Windows are the biggest single area of heat loss in the home.


Custom replacement windows give you the perfect fit, therefore existing siding and wood trim can remain and do not have to be replaced or modified when installing replacement windows. Conversely, stock windows are available only in standard sizes. If, for example, your window opening is larger than a standard size, you’re left with an opening around the perimeter of the window. This opening is often filled with sheet rock or molding and you are left with extra space to patch and paint. Custom replacement windows allow you to maximize your viewing area without jeopardizing the visual esthetics of your home.

What is a Thermal Break?

Area that can slow the flow of heat or cold.

What is Single Pane Glass?

One pane of glass generally 1/8” thick. Doesn’t have any thermal break. (Double hung window approximately a 1.00 U-factor)

What is Double Pane Glass?

Two panes of glass in frame creating a thermal break. The space between panes normally is filled with Argon gas. Keeps glass warmer. (Double hung window approximately a .30 U-factor window)

What is Double Pane Suspended Film Glass?

Two panes of glass and a center layer of suspended film with Krypton gas in the space in between. This glass unit is 50% lighter in weight than a triple pane unit. This eliminates the strict size constraints and accelerated wear triple pane units experience. (Double hung window approximately a .20 U-factor)

What is Triple Pane Glass?

Three panes of glass often with Krypton gas in the space between panes. Krypton gas is used for thinner/smaller air spaces performing the same function as Argon gas with double panes. Krypton is a better insulator than Argon. (Double hung window approximately a .20 U-factor)

What is U-Factor vs. R-Value?

U-Factor measures how well a window prevents heat from escaping. The rate of heat loss is indicated in terms of the U-factor of an entire window assembly (glass, frame, seals, etc). U-factor ratings generally fall between .15 and 1.20. The lower the U-factor, the greater a window's resistance to heat flow and the better its insulating value.


R-Value is a measure of thermal resistance. How well a material resists flow of heat. It is the inverse of the U-factor (R = 1/U) and is expressed in units of hr-sq ft-°F/Btu. A high-effective R-value window has a greater resistance to heat flow and a higher insulating value than one with a low R-value. R-Values for windows generally fall between .83 and 6.67.


Note: An old single pane glass window with a storm has an R-Value of approximately 1.

What is insulating glass?

Insulating glass consists of two pieces of glass sealed to a spacer. This creates an insulated air space between the two pieces of glass (filled with either Argon or Krypton gas), resulting in better thermal performance. Insulated glass also reduces condensation while keeping the heat in during the winter, and heat out during the summer.

What is Low-E glass?

Low-E (Emissivity) glass is treated with thin, virtually invisible, transparent coatings of various layers including metal oxide and silver. During the winter, Low-E glass allows the sun's natural light and short-wave energy to freely pass through while reflecting long-wave heat energy back inside, keeping your home warmer. In the summer, Low-E glass reflects long-wave heat energy to the outside keeping your home cooler and, reduces the penetration of the sun's ultraviolet (UV) rays, minimizing the fading of carpet, furniture and draperies.

What is Low-E glass with Argon gas? How does it work?

Added inside an insulating glass unit with Low-E Glass, Argon gas is an invisible, insulating blanket that replaces most of the air during the manufacturing process. With Low-E reflecting heat away, Argon gas buffers thermal transfer to enhance the performance of the entire glass unit.

What is Krypton gas?

Krypton gas is an inert, odorless, colorless, tasteless, non-toxic gas that is denser than air. It is used to replace air between the glass panes in an insulating glass unit to reduce temperature transfer and deter convection (heat transfer by currents that flow from a warm surface to a colder surface). Krypton is a better insulator than Argon gas.

What is Conduction?

Conduction refers to the energy transfer from one material to another by direct contact.

How should I evaluate the energy performance of a window or patio door?

Look for the NFRC Label (National Fenestration Rating Council - http://www.nfrc.org) on the window or patio door. This label may show the U-Factor, Solar Heat Gain, Visible Light Transmittance, Condensation Resistance and Air Leakage values. Look under Replacement Window Energy Efficiency FAQ’s for more information.


The National Fenestration Rating Council (NFRC) is a nonprofit, public/private organization created by the window & door industry in 1989 due to the energy crises in the 1970’s. It is composed of manufacturers, suppliers, researchers, architects/designers, code officials, utilities, and government agencies. The NFRC has developed a window energy rating system based on whole product performance.


The NFRC label provides the only reliable way to determine the window energy properties and to compare products. The NFRC label appears on all products certified to the NFRC standards and on all window and door products which are part of the ENERGY STAR™ program.

What are Air Chambers?

Air Chambers are small spaces within the extruded sash and frame profiles that help to insulate and strengthen the window. Premium windows have insulated chambers.

What are window sashes?

A sash is the part of the window or door that contains the glass. Sashes can be made out of wood, vinyl, fiberglass or aluminum.

What does "fusion-welded" mean?

Fusion-welding is the process of joining materials by melting them together with extreme heat, resulting in the materials bonding into one piece. Vinyl window sashes are fusion welded.

What is a vinyl replacement window?

A replacement window is a window designed to fit into an existing window opening. It’s built to fit precisely and can be installed without disturbing the interior and exterior. High quality vinyl replacement windows are made from 100% uPVC. The combined strength of the multi-chambered insulated frames and sashes and fusion-welded corners, make vinyl windows one of the most reliable and energy efficient windows that you can purchase.

What is PVC vs. uPVC vinyl?

Not all vinyl windows are created equal. The type of vinyl used in the window has a direct effect on the quality of the product. Typically, vinyl windows are made out of a compound known as polyvinyl chloride, or PVC. In general, PVC can be difficult to push through the dies, in order to make the extrusion. To aid the PVC through the dies, plasticizers are added to make the compound more pliable. While plasticizers aid in the production of the extrusion, they can have some adverse side effects as well. Plasticizers can make the vinyl itself very dense and brittle, thus making the final product susceptible to cracking and the effects of ultra-violet light. This is not exactly the type of product most people would want in their home.


However, there is an alternative: Unplasticized-polyvinyl chloride, or uPVC. With this compound, no plasticizers are added. Instead, other additives are mixed with the compound to provide protection from weathering, impact strength, and aid in the processing of the material. The final product is stronger, longer lasting, and will fight the effects of ultraviolet light.


ClearView is proud to offer several lines of windows using uPVC. Over the years, we have come to enjoy the benefits of offering these products, and we think you will too.

What is a Balance System?

A balance system is a device for holding vertically sliding sashes in any position through the use of a spring or weight to counter balance the sash.

What are Grids or Muntins?

Grids are decorative, horizontal or vertical bars installed between the glass panes or on the outside to create the appearance of the sash being divided into smaller lites of glass.

What is Tempered Safety Glass?

Tempered Safety Glass is treated with high heat for strength. If tempered safety glass is broken, it will shatter into very small pieces instead of shards. It is 400 to 600% stronger than standard glass.

end faq

 

  Window Types  

Click on the window type below to visit our photo galleries.

  • Single or Double Hung – raises up and down on a track
  • Casement – cranks out left or right
  • Sliding – slides left and right on a track
  • Awning – cranks out from the bottom
  • Picture – stationary window with no operation
  • Specialty Shape – picture window that is not square or rectangular
  • Hopper – tilts in from the top
  • Bay- see below
  • Bow- see below
  • Garden- see below

Bay Window vs. Bow Window

Bay Windows consist of three windows in a single frame. The center lite is always twice as wide as the sidelites. Generally, Bay Windows are a combination of fixed centers, and two operable flankers (casements or double hung windows). Bay Windows project out from the house wall at 9, 15, 30, 45 or 90 degrees.


Bow Windows consist of 3, 4, or 5 windows in a single frame. All of the windows are equal size, and are generally a combination of fixed centers and two operable flankers (casement or double hung windows.) Bow Windows project from the wall of the house at 9, 15, 30 and 45 degrees. Bow Windows are similar to Bay windows, but the Bow Window's combination of windows has a more circular arch appearance.

Garden Window

90 degree Bay Window (Box Bay) that has a slanted glass roof with windows that open on each side. They are normally found over a kitchen sink and are used typically to grow plants.

end faq

 

  Assessing Replacement Window Value  

How can new windows pay for themselves?

If you still have old leaky windows, the money you are losing every month would pay for new custom windows!


There are three ways you pay the price:


  • Infiltration - Wood sashes shrink in winter which ultimately opens gaps. In fact, just a very thin 1/16” gap around a window is like having a hole the size of a brick in your wall. How many brick size holes do you have in your house?
  • Radiation - Heat naturally radiates to cold. In winter, heat goes out. In summer, heat comes in. Radiations through window panes cause at least 21% of total energy loss. The result is that your furnace and air conditioner are working overtime, wasting hard earned dollars!
  • Conduction - Conduction is straight energy waves which also seek extreme temperatures. They can waste even more energy than infiltration and eat up your energy dollars without remorse.

How much do windows cost?

Replacement window prices are determined by size, style and the labor involved in removing your old windows and installing your new ClearView Windows. How do I get an Estimate?

What is cost vs. value?

  • Cost- How much you pay for something.
  • Value- How much you get back in relation to that cost in terms of function and energy savings.

Think long-term about your investment in new windows and doors: you want a quality product that will last and provide years of enjoyment and performance, so the lowest price may not be the best choice. To realize a valuable return on investment, look for a product that will perform up to your expectations and add value to your home, and ultimately your quality of life.

Are new windows a bad investment if I plan on selling my home?

No! They should increase the overall value of your home. In most cases, if your windows are outdated at the time of a sale, the Home Inspector will note that they have to be updated (replaced). In this instance the home buyer will look for discounts in the sale price to cover the cost of updating the windows.

What makes a vinyl window better than a wood window?

Vinyl windows are maintenance free, never needing staining or painting, they won't rot or split and are not susceptible to termites, other wood destroying insects or black mold. Click here for comparison chart

How long do replacement windows last?

Click here for comparison chart

What is the difference between Andersen™, Pella™, Marvin™ and ClearView windows?

You may only be considering a window such as Andersen™, Pella™ or Marvin™. Premium Andersen™, Pella™ or Marvin™ windows start at very high prices per installed window (regular size double hung). Today’s wood windows (any manufacturer of wood windows) are made out of farm raised, wide ring, soft pine and don’t last as long as older wood windows (usually made from hard woods or pine naturally grown with tight rings). Farmed wood is soft and more susceptible to moisture damage including rot and mold. Older windows were normally protected by storm windows as well and storms usually are removed when installing new windows. Although most new windows offer metal cladding to protect the outside of the window, we do find that the wood cladded windows that we are replacing are rotting just behind the cladding on the outside and at the bottom of each sash where the glass meets the wood sash frame on the inside.


Big box home improvement suppliers sell Andersen™, Pella™ or Marvin™ windows of a lower grade compared to the local franchise dealer. For example, you can buy a high end Andersen™ window from your local franchise dealer in Madison, but you can’t buy it from a big box store or another non-franchised remodeling contractor in the area. However, you can by a low end Andersen™ window at a big box store or from another non-franchised remodeling contractor in the area.


ClearView’s high quality vinyl windows cost nearly 50% less than the name brands such as Andersen™, Pella™ or Marvin™. Our windows are virtually maintenance free, unlike wood windows that rot & mold, come with a lifetime warranty, are more energy efficient and are available with wood looking interiors.

What are the advantages of custom replacement windows over pre-made, standard-size windows?

Because custom windows are made to fit perfectly, they provide the best energy efficiency and can be installed much more easily and with very little mess. Also, because of the myriad of options available affecting appearance and efficiency, custom windows allow consumers to get exactly the windows they need and want.


Standard windows sometimes cost less in the beginning, but other expenses and factors, such as additional labor and disruption to the home, far outweigh the original savings. For example, installing stock windows often requires removal and reinstallation of siding on the exterior, and removal and reinstallation of interior trim.

Will replacement windows really pay for themselves?

If you select high-quality, energy-efficient windows, your windows will "pay back" your investment in savings realized with lower heating and cooling bills. Well engineered windows have been proven to lower home energy consumption. According to the Department of Energy, R-5 windows (windows with a U-Value of .20 or less) reduce average heat loss through windows by 30-40%.

What features make ClearView replacement windows so good for Wisconsin weather?

ClearView’s replacement windows minimize winter heat loss while allowing free solar energy into your house, reducing heating costs. In the summer, specially designed glass systems keep your interior glass cooler (as compared to clear glass), reducing air conditioning loads. Moreover, this glass system reduces damaging UV rays and helps prevent damage to interior drapes, upholstery and carpet.

Is there a big difference in how ClearView vinyl replacement windows are manufactured?

Absolutely. If you've sat through a sales presentation on windows, you know there are dozens of different vinyl, glass and insulation options, types of reinforcements and qualities of hardware. Some companies will "hook" you with a low price, then up-sell you on features like "better" glass, installation details, UV coatings, custom color and screen options. At ClearView we do not play price games. We feature the best performing window products available for a fair price. How do I get an Estimate?


Vinyl withstands assaults from moisture, heat, cold, humidity, salt, pollutants and acid rain; assaults that can and do affect wood and metal. Vinyl windows and patio doors never flake, blister, stick, rot, rust, peel or corrode. Vinyl’s color is integrated throughout the material, so scratches go virtually unnoticed. You never have to paint, strip and sand or lubricate vinyl windows or patio doors. Vinyl is truly the most durable, lowest maintenance window and patio door material available.

What is the difference between the cheap vinyl windows I see advertised versus quality custom vinyl windows?

There are different qualities of windows available. The glazing technology, glass system, vinyl composite, profile and construction of the rails, are just a few things contributing to final performance and price.

end faq

 

  Replacement Window Energy Efficiency  

Why should I be concerned about windows?

Windows are one of the most important aspects of regulating home temperatures. Most windows in older homes were designed when energy was cheap and new energy efficient materials were unknown. Today’s newer energy efficient windows are designed with overall thermal efficiency in mind; keeping the heat in and the cold out. Typically, an older home can lose 30 to 40 percent of its energy through leaky, drafty windows and doors.


If you still have old leaky windows, the money you are losing every month would pay for new custom windows!


There are three ways you pay the price:


  • Infiltration - Wood sashes shrink in winter which ultimately opens gaps. In fact, just a very thin 1/16” gap around a window is like having a hole the size of a brick in your wall. How many brick size holes do you have in your house?
  • Radiation - Heat naturally radiates to cold. In winter, heat goes out. In summer, heat comes in. Radiations through window panes cause at least 21% of total energy loss. The result is that your furnace and air conditioner are working overtime, wasting hard earned dollars!
  • Conduction - Conduction is straight energy waves which also seek extreme temperatures. They can waste even more energy than infiltration and eat up your energy dollars without remorse.

Energy efficient windows increase the comfort level in your home by reducing cold drafts and making a house feel warmer in the winter and cooler in the summer. They help control condensation because the interior surfaces of energy-efficient windows stay warmer, allowing you to maintain a higher level of humidity without worrying about condensation on your windows. They also last longer because condensation can cause premature deterioration of windows, walls and finishes leading to high maintenance and replacement costs. (EPA: Moisture, Condensation & Humidity in Homes)


Most importantly, energy efficient windows save a lot of money. By minimizing air leakage and improving thermal performance of your windows, you could reduce heat loss through windows by up to 500% and reduce your energy costs by up to 40%. (Entire Window R-1 improved to R-5)

How can I tell if a window or door is energy efficient?

Look for the NFRC Label (National Fenestration Rating Council - http://www.nfrc.org) on the window or patio door. This label may show the U-Factor, Solar Heat Gain, Visible Light Transmittance, Condensation Resistance and Air Leakage values.


The National Fenestration Rating Council (NFRC) is a nonprofit, public/private organization created by the window & door industry in 1989 due to the energy crises in the 1970’s. It is composed of manufacturers, suppliers, researchers, architects/designers, code officials, utilities, and government agencies. The NFRC has developed a window energy rating system based on whole product performance.


The NFRC label provides the only reliable way to determine the window energy properties and to compare products. The NFRC label appears on all products certified to the NFRC standards and on all window and door products which are part of the ENERGY STAR™ program.



NOTE: This information and the information under Replacement Window Energy Efficiency about U-Factor, Solar Heat Gain, Visible Light Transmittance, Condensation Resistance and Air Leakage is from the Energy Efficient Windows Collaborative website and has been modified for Sunrooms & Replacement Windows by Ben Kripps, Owner of ClearView Sunrooms & Windows. For more information visit http://www.efficientwindows.org

What is U-Factor?

The rate of heat loss is indicated in terms of the U-factor of the whole window including the glass, seals, frame and spacers. The lower the U-factor, the greater a window's resistance to heat flow and the better its insulating properties.


High-performance (Low-e with Argon Gas) double pane replacement windows usually have U-factors of .28 to .35, while some triple pane and double pane suspended film windows can achieve U-factors as low as .15 to .20.


Low U-factors are most important in heating dominated climates like Wisconsin. Energy Star rated windows in the Northern region (Wisconsin) must have U-factors ≤.30.


NOTE: U-Factor information is from the Energy Efficient Windows Collaborative website and has been modified for Sunrooms & Replacement Windows by Ben Kripps, Owner of ClearView Sunrooms & Windows. For more information visit http://www.efficientwindows.org

What is U-Factor vs. R-Value?

U-Factor measures how well a window prevents heat from escaping. The rate of heat loss is indicated in terms of the U-factor of an entire window assembly (glass, frame, seals, etc). U-factor ratings generally fall between .15 and 1.20. The lower the U-factor, the greater a window's resistance to heat flow and the better its insulating value.


R-Value is a measure of thermal resistance. How well a material resists flow of heat. It is the inverse of the U-factor (R = 1/U) and is expressed in units of hr-sq ft-°F/Btu. A high-effective R-value window has a greater resistance to heat flow and a higher insulating value than one with a low R-value. R-Values for windows generally fall between .83 and 6.67.


Note: An old single pane glass window with a storm has an R-Value of approximately 1.

What is Solar Heat Gain Coefficient (SHGC)?

The SHGC is the fraction of incident solar radiation admitted through a window, both directly transmitted and absorbed and subsequently released inward. SHGC is expressed as a number between 0 and 1. The lower a window's solar heat gain coefficient, the less solar heat it transmits. SHGC numbers include the entire windows glass & framing.


Finding a balance between providing free heat in the winter and reflecting solar heat in the summer can be done with numbers between .25 and .40. SHGC depends upon the climate, sun orientation, shading conditions, window locations and other factors. Energy Star rated windows in the Northern region (Wisconsin) are allowed to have any SHGC number.


NOTE: Solar Heat Gain Coefficient information is from the Energy Efficient Windows Collaborative website and has been modified for Sunrooms & Replacement Windows by Ben Kripps, Owner of ClearView Sunrooms & Windows. For more information visit http://www.efficientwindows.org

What is Visible Transmittance (VT)?

The visible transmittance (VT) is an optical property that indicates the amount of visible light transmitted. VT numbers include the entire windows glass & framing. While VT theoretically varies between 0 and 1, most values among double and triple pane windows are between 0.30 and 0.70. The higher the VT, the more daylight is transmitted.


Energy Star does not reference the VT number.


NOTE: Visible Transmittance information is from the Energy Efficient Windows Collaborative website and has been modified for Sunrooms & Replacement Windows by Ben Kripps, Owner of ClearView Sunrooms & Windows. For more information visit http://www.efficientwindows.org

What is Air Leakage (AL)?

Heat loss and gain occur by infiltration through seals in the window assembly. It is indicated by an air leakage rating (AL) expressed as the equivalent cubic feet of air passing through a square foot of window area. The lower the AL, the less air will pass through seals in the window assembly. Select Windows with an AL of .30 or less, but high quality windows have AL numbers of .10. The lowest number achievable from testing on the NFRC label is .10.


Energy Star does not reference the AL number. AL numbers are optional on the NFRC label.


NOTE: Air Leakage information is from the Energy Efficient Windows Collaborative website and has been modified for Sunrooms & Replacement Windows by Ben Kripps, Owner of ClearView Sunrooms & Windows. For more information visit http://www.efficientwindows.org

Condensation Resistance (CR)?

CR measures how well a window resists the formation of condensation on the inside surface. CR is expressed as a number between 1 and 100. The higher the number, the better a product is able to resist the potential for condensation formation. High quality windows have CR numbers from 55 to 75.


Energy Star does not reference the CR number. CR is an optional rating on the NFRC label.


NOTE: Condensation Resistance information is from the Energy Efficient Windows Collaborative website and has been modified for Sunrooms & Replacement Windows by Ben Kripps, Owner of ClearView Sunrooms & Windows. For more information visit http://www.efficientwindows.org

What is Energy Star™?

Energy Star™ is a joint program of the U.S. Environmental Protection Agency and the U.S. Department of Energy, helping us all save money and protect the environment through energy efficient products and practices. Energy efficient choices can save families about a third on their energy bill with similar savings of greenhouse gas emissions, without sacrificing features, style or comfort.


Energy Star™ helps you make the energy efficient choice. If looking for new household products, look for ones that have earned the Energy Star™. They meet strict energy efficiency guidelines set by the EPA and US Department of Energy. If looking for a new home, look for one that has earned the Energy Star™. If looking to make larger improvements to your home, EPA offers tools and resources to help you plan and undertake projects to reduce your energy bills and improve home comfort. For more information, please visit the Energy Star™ website at www.energystar.gov.


Note: tax credits will be listed under Energy Star if they are available.

end faq


  When & Why I Should Replace Windows  

When should I replace my windows?

  • When your windows are drafty
  • When your heating and cooling bills continue to rise
  • When your windows are difficult to open and close
  • When your windows won’t open at all
  • When your windows do not provide adequate security for your home and family
  • When your windows allow dust and dirt into your home
  • When your windows don't block outside noise
  • When your windows appear foggy
  • When you have excessive condensation or icing on the inside of the window panes
  • When your windows are difficult to clean
  • When your windows cost you time and money in maintenance
  • When your windows rattle in the wind
  • When your house is always too cold in winter - or too hot in summer
  • When you are tired of painting your window exteriors or refinishing your interiors
  • When your windows look ugly to you
  • When your windows are falling apart or rotting
  • When your windows are molding

Can windows be installed year-round?

Yes. For the most part we prep, remove and install windows from inside the home, and the amount of time you're actually without a window can be kept to a minimum to help reduce heat loss in the winter months. We prefer the thermostat to be turned down to 60°F during the day while we are working.

Do replacement windows meet building codes?

All of our products are manufactured to the AAMA standard and meet the NFRC (National Fenestration Rating Council - http://www.nfrc.org ) requirements for Fenestration products. National and Local Building Codes may ask for additional requirements to meet codes in your area, such as egress and tempered safety glass. ClearView Sunrooms & Windows knows or has quick access to all codes in Wisconsin.

Are replacement windows easy to operate and clean?

Yes, all of our products are easy to clean and operate. Our double hung windows have a state-of-the-art system tailor made for your custom window, making it one of the easiest operating windows. They easily tilt in for safer cleaning from the inside of your home. Slider windows glide along a track on wheels for ease of operation and lift out for cleaning. Our casement window has an effortless operator that opens the window to a 90 degree slide over position allowing for easy cleaning of the outside of the window from inside the home.

I know energy efficiency is important, but can the glass really make that big of a difference?

Absolutely! A quality built vinyl replacement window can increase your glass R-value from 1 up to 10 depending on the glass system you select. These ratings are determined by 3rd party testing facilities to accurately rate windows so you compare and make a wise, energy saving decision.


However, windows should be compared by U-factor which is listed on the NFRC label and rates the whole window including the glass, seals, frame and spacers.

Will replacement windows eliminate condensation?

Every home has air-borne moisture vapor that is present which is a good thing. On a window, the greater the hot and cold differences the more moisture turns into condensation. However, high-quality windows incorporating warm-edge technology glazing systems can help to reduce condensation. Windows built with warm-edge technology are much less thermally conductive than other window types, they help keep the temperature of the window warmer—minimizing the hot and cold differences that turn moisture into condensation.


EPA: Mositure, Condensation & Humidity in Homes

end faq


  Window Mostiure & Condensation  

What causes condensation on the inside of my windows?

Condensation is a natural occurrence on all windows and is caused by humidity, or invisible water vapor, present in the air. When this water vapor comes in contact with a surface that is cooler, the vapor turns into droplets of moisture.


ClearView windows have built-in features to keep the temperature of the glass as warm as possible and thus reduce condensation. Our insulated glass provides superior energy efficiency to reduce the potential for condensation. However, there is no such thing as a condensation-free window in high humidity conditions. Controlling the amount of moisture in your home is the most effective action you can take to avoid condensation.


EPA: Mositure, Condensation & Humidity in Homes

EPA: Moisture, Condensation & Humidity in Homes

EPA: Mositure, Condensation & Humidity in Homes

end faq