
yep. condensation is almost always because of external factors, and yes, new windows can sweat. Typically on the exterior in the am during the warmer months, then on interior in am in the colder months.
Do Your Windows sweat a lot?
Almost all of the windows sweat very bad, especially those that face the morning sun. I’ve read many of the post above, and your answers. Still not sure what will be the best option to solve our problem.
Do your double pane windows sweat?
Of course the question come up as winter is here in the NW. We have double pane aluminin window on one side of the house and these are the ones that sweat on the inside. Our old wooden ones with the storm windows do not.
Do dehumidifiers help with sweating windows?
You can help regulate the amount of moisture in the air with a dehumidifier. Not only will a dehumidifier help eliminate sweating windows, but it’ll also help reduce allergens in your home making the indoor air quality better. As with single-paned windows, poorly insulated windows are less energy efficient.
What causes the ice and sweating on the inside of Windows?
Is it possible that the ice and sweating on the inside of my house windows could be caused from underneath the house being sealed up to tight. Like to much insulation. Such as headers being foamed sprayed plus regular insulation on top of that?

Are new windows supposed to have condensation?
It is not unusual to have condensation on the outside of new energy efficient windows; in fact, it's perfectly normal. It may seem like a strange phenomenon, but once you understand what's going on it makes total sense! Condensation forms on an object when that objects surface temperature goes below the dew point.
Are windows supposed to sweat?
Sweating windows have condensation build-up on the surface of the glass. Because the temperature of the glass varies more than other parts of the home, windows are more susceptible to condensation. In high humidity areas like Jacksonville, windows often experience more window sweat than drier climates.
Why are my new windows sweating on the inside?
What causes condensation on the inside of windows? Condensation on the interior of windows and doors occurs when warm, humid air comes into contact with cool glass. This is especially common in the winter when outside air is cold and dry, and the indoor air is warm and humid.
Is it normal for house windows to sweat?
When cold weather sets in, condensation can appear on windows and sliding glass doors. Often called "sweaty windows," the condition is the result of high humidity and low temperatures. It can block the view, drip on the floor, and freeze on the glass.
What Causes Window Sweat?
In the winter, the inside surfaces of even good quality windows are likely the coldest surfaces in your home. The air inside your home will naturally form a convection current cycle (visible, at right) against these cold surfaces.
Why is there moisture in my windows?
Excessive moisture forming on interior window glass may be pointing to an issue with the ventilation of your home. In fact, most homes with relatively modern window assemblies that are showing interior window condensation in the winter have more of an issues with the air quality in the home home than the quality of the windows.
Why do windows rot in winter?
Moisture from showers, respiration, and cooking tends to build up in our homes during the winter, causing window condensation, mold and mildew growth, and possibly even rot.
What happens when colder air sinks?
As colder air sinks, warm air replaces it.
Can windows sweat?
If you have problems with window sweat, your windows may be at fault, but maybe not. The only way to be certain is to have an independent professional energy auditor evaluate your windows along with the air exchange and air leakage of your home.
Why do windows sweat?
Because the temperature of the glass varies more than other parts of the home, windows are more susceptible to condensation. In high humidity areas like Jacksonville, windows often experience more window sweat than drier climates. Another common cause of sweating windows is when the bathroom or kitchen steams up during a shower or cooking.
What happens if you have condensation between the panes of your windows?
If you have double-paned windows and notice condensation between the panes, you likely have a seal leak. Contact your local window service professional to discuss repair options for your windows.
Why replace single paned windows?
To help reduce window condensation and the damage excess moisture can cause to the window casings, surrounding walls and floors, replace your old single-paned windows. New window technology provides better insulation with the use of low e-glass.
Why are single pane windows less efficient?
The lack of insulation can lead to more condensation on the window surface. Not only that, but the reduced energy efficiency means that your home’s air conditioner must work harder to keep your home’s temperature stable.
How to prevent mold and mildew on window casing?
First, for condensation in the bathroom or kitchen due to use , turn on the exhaust fan for at least 15 minutes after a shower or cooking to allow the air to escape. This simple step can help avoid unwanted mold and mildew on window casing. Another simple solution is to open a few windows in your home for five to 10 minutes each day. This easy act allows air to circulate throughout your home.
Why is it important to have an HVAC system?
A properly working HVAC system helps keep your home’s temperature stable and reduces the amount of unwanted condensation. Regularly scheduled HVAC maintenance is a great way to keep your system working properly. However, if you notice new sweating windows, you may want to have your HVAC system checked before you tackle other solutions to rule out a possible problem.
Why is humidity important?
It’s important to take excess moisture seriously to avoid costly repairs to your home.
What does condensation on new windows mean?
The condensation on the new windows is a sign that your windows are better insulated than they ever have been.
Why do windows have condensation?
Some new windows have condensation because the surface of the window is below the dew point. This is NOT a bad thing. What is happening on those windows with the condensation is that the window is performing exactly as designed…It is blocking the heat from inside your home from reaching the outside of your home thus allowing the outside windows to be cooler than the morning dew point.
What does low E mean on windows?
For Low-E windows what this means is that the Low-E keeps the glass temperature closer to the outside temperature than the inside temperature. What’s great about that is that it keeps your inside temperature from fluxuating and you have a more constant temp inside your home.
What is low E glass?
Low-E glass acts basically like a reflector for heat and energy, and is truly a very thin coating of metal. So, if you have humidity come up against cold metal (like breathing on a cold mirror, or when you get a cold can of soda on a hot day) you’re going to have condensate. Water will bead on the cold surface.
Does a screen window have condensation?
Even the length and angle of the soffit or other overhangs can affect the formation of condensation. Operable windows with screens can sometimes only have the condensate on the fixed panel of the window. The half that has the screen is the operable half and can let in a minimal amount of air infiltration; enough to cool ...
Can humidity cause condensation?
A tiny change in either temperature or humidity might raise or lower the dew point just a little bit and you might see a whole different level of condensation. Even raising the temperature in the room by a few degrees can make a difference. So can using a fan, or just opening the window.
Is it normal to have condensation on the outside of a new window?
Their old windows didn’t do this, so the new ones must be defective! Not at all! In fact, the new windows are performing better than ever before. It is not unusual to have condensation on the outside of new energy efficient windows; in fact, it’s perfectly normal. It may seem like a strange phenomenon, but once you understand what’s going on it makes total sense!
Why do windows get condensation in hot weather?
Window condensation in hot weather often occurs due to unobstructed views. So, exterior shutters or shades that block direct sunlight might be a consideration.
How to prevent condensation in windows?
How to Prevent Window Condensation 1 Run the bathroom vent while you shower or bathe, and for 10-15 minutes after you are finished. 2 Use the overhead vent on your stove during and after moisture-producing cooking. 3 Make sure your clothes dryer is properly ventilated. 4 Occasionally open windows for a few minutes to ventilate your home. 5 Try to minimize or prevent conditioned air from directly contacting your windows. 6 Make sure your HVAC system is working properly. 7 More challenging cases may require a dehumidifier.
What happens if condensation forms between two panes of a window?
This means the seal, which is supposed to be airtight, has likely been broken. If seal failure has occurred, the glass will need to be replaced.
Is it bad to have condensation on windows?
The good news is that this is usually not a sign that your windows are in bad condition. Ironically, you may be experiencing window condensation due to how well your windows are doing their job. Modern windows do a wonderful job of insulating your home.
Do low E windows reduce heat?
While low-E coated windows reduce the amount of heat that comes into your home, they may create just the right temperature difference that condensation occurs during warm weather .
Can condensation occur on the inside of windows?
In the winter, if it’s cold outside and you are heating your indoor environment, and if the relative humidity is not where it should be, condensation can occur on the inside of your windows.
How to prevent condensation in windows?
Cut heat down to 68 degrees F. Curtains and blinds cause major condensation in winter. Put up thin curtains in winter, or raise blinds a little at bottom to prevent condensation. Insulated windows do not need thick curtains and blinds.
How to prevent moisture in the air?
To reduce this problem you need to either lower the amount of moisture in the air inside your home, or prevent it from coming in contact with cold surfaces. Here are some suggestions that might help: 1 Run a vent fan in the bathroom when you shower or bath, and leave it on for 15 minutes afterward. Be sure it is vented to the outside and has a high enough capacity for the room. Also, be sure there is a large enough gap under the bathroom door to allow air to enter. 2 Vent gas fireplaces, or limit their use, and don’t use older unvented gas space heaters. 3 Cut down on cooking that produces excess steam. 4 Lower your thermostat to 66°-68° F. 5 Be sure your clothes dryer is vented properly to the outside. 6 Seal up any cracks around windows. 7 Replace older single pane windows with double or triple pane vinyl ones (avoid metal window frames since they conduct cold), or add storm windows to the outside of your house. 8 If you are still having problems, consider installing a dehumidifier.
What happens to air when it warms?
When air warms, it expands which allows it to hold more moisture. As it cools down, it contracts until it reaches the saturation point and releases this excess water in the form of condensation.
Why do I need a moisture barrier?
A complete, sealed, heavy plastic moisture barrier should be installed beneath my house to keep dampness from rising from the moist dirt up into my house.
Do double pane windows have moisture?
I have double pane windows, the indoor humidy is at 39% and we have water on the windows constantly. The windows today have oblong moisture areas in the middle of each window. WE have done the technique of opening windows to combat the moisture, but see that as leaving the door open and paying to heat the outside. Not a good answer. What we have done is to place small fans to dirently ventilate the norhtern exposed windoows, which are large picture windows.
Can you replace single pane windows with double pane windows?
Replace older single pane windows with double or triple pane vinyl ones (avoid metal window frames since they conduct cold), or add storm windows to the outside of your house.
How to dry out sweaty windows?
Listed below are a few of the ways to dry out sweating windows: • Open window blinds during the day. This allows sunlight in that will warm interior air to create natural air currents. The improved circulation results in more even temperature and hot and cold spots that result in condensation.
Why do windows condense?
Condensation is a natural occurrence on all windows and is caused by excess humidity, or invisible water vapor, present in the air. When this water vapor comes in contact with a surface which is at a cooler temperature, the vapor turns to visible droplets of moisture. Many modern energy-efficient windows have features built in to keep ...
What is the process of sweat turning into ice?
This excessive moisture that is commonly referred to as “sweating windows,” is really condensation. Condensation is the process of water vapor in the air turning into liquid water. It’s the same condition that occurs when a cold can ...
Why does soda condensation form on windows?
Condensation is a natural occurrence on all windows and is caused by excess humidity, or invisible water vapor, present in the air.
Is insulated glass condensation free?
However, there is no such thing as a condensation-free window in high humidity conditions.
Is a ceiling fan good for winter?
Many people believe that a decorative ceiling fan is only useful to cool you down on those sticky summer evenings. They’re probably the same ones that are battling condensation. In reality, a good ceiling fan is like money in the bank year round. In winter, run the fan in the reverse direction at a low to moderate speed.
Can replacing windows help with condensation?
Window replacement can do wonders to improve energy efficiency and increase home comfort, but it may do little to avert sweaty window syndrome. As a matter of fact, just the opposite may be true. Ironically, many homeowners are discovering that their new energy-efficient windows have more condensation that their old ones. While well-insulated, tight-fitting windows provide draft-free comfort and can help lower your fuel bills, airtight windows can trap moisture inside your home. Previously, moisture in the air may have leaked to the outside through openings in your old loose-fitting windows, thus preventing condensation.
When do you see condensation on your windows?
Homeowners are more likely to see exterior window condensation early in the morning after a cool night. As the sun shines and begins to warm up the glass, the dew on the outside of your windows will evaporate.
How to keep windows from getting condensation?
To combat exterior condensation, open window coverings at night to warm up exterior glass. You can also trim shrubbery near windows or doors as this will help promote air circulation. Raising the temperature setting on your air conditioner may also help keep your window glass at a warmer temperature. If you think it might be time to replace ...
Why does condensation appear on windows?
Because glass surfaces are usually some of the coldest parts of your home, condensation appears on windows first. This is generally in the form of water droplets or frost on the interior of your window. As interior air becomes drier or as the glass surface becomes warmer, condensation begins to evaporate.
Why do windows have condensation?
Condensation on the interior of windows and doors occurs when warm air comes into contact with cool glass. This is especially common in colder months, when indoor air is warmer and more humid and outdoor air tends to be cold and dry. Even if you aren’t running a humidifier, everyday activities like bathing, cooking and even breathing all contribute to the humidity in your home.
How to reduce humidity in home?
Some ways to reduce air moisture include using a portable dehumidifier or installing a whole-home dehumidifier.
When does condensation occur on the outside of a window?
Condensation on the Outside of Windows. Exterior condensation generally occurs in the summer months when exterior humidity levels are higher. Exterior window condensation forms in the same way as roomside condensation when the temperature of the glass is cooled and comes into contact with that warm, humid air.
Is condensation a sign of high humidity?
Window condensation can be frustrating. While it is a good indicator of high humidity levels, you can help reduce window condensation with these tips.
