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Low E is a coating applied to the inside of the glass unit. It keeps the heat in during the winter and the heat out in the summer. Argon is an insulation gas that is used between two panes of glass.

Today’s energy-efficient homes are built more airtight than ever. But in addition to sealing in warmth and air conditioning, they also tend to hold in too much moisture-laden air.

If your home contains excessive moisture and it’s cold outside, the first place you’ll see it is on your windows. You may think this means there’s a problem with your windows, but it doesn’t. In fact, the vast majority of window condensation problems are not the result of faulty windows. The windows are just indicating that your home needs added ventilation to lower the amount of moisture in the air.

Occasional beads of moisture on the glass of your windows usually isn’t a problem.

For example, it’s likely your bathroom mirror and windows will steam up after a hot shower. Or your kitchen window may fog up when you’re boiling food on the stove. But in both these cases, the moisture clears in a matter of minutes.

However, if your windows are “sweating” at other times – or stay that way for any length of time – you probably do have a problem.

Although the glass itself may not be affected, dripping condensation and excess moisture can not only damage your windows but potentially your entire home.

• Wood frames and sash can warp and become difficult to operate
• Paint can peel and other finishes become mottled or stained
• Insulation can become damp, damaging ceilings and walls
• Exterior siding and finishes can become blistered and warped
• Interior surfaces can become breeding grounds for mold and mildew

This is why it’s so important to take steps to control and eliminate excess moisture.

In a word, everywhere.

• In the kitchen, moisture is generated by cooking food, using the sink, running the dishwasher
• In the bathroom, from showers, hot tubs and spas
• Washers and indoor-vented dryers contribute as well
• Basements and crawl spaces can channel dampness from the ground into your home
• Even breathing and perspiration add moisture to indoor air

Collectively, a family of four can easily generate up to 18 gallons of water a week in the form of humidity inside your home.

To lower your home’s humidity levels, you need to increase ventilation and decrease the sources of moisture.

• Make sure you have good ventilation in high-humidity areas: bathrooms, the kitchen, laundry
• areas and in the basement
• If you already have adequate exhaust fans and dehumidifiers in these areas, try running them for longer periods of time
• Take shorter showers and install water-restricting faucets – you’ll lower the humidity and your energy bills as well
• Cook a little differently. Keep pots and pans covered to hold moisture in. Use your microwave instead of boiling on the stove. Slow-cooking crock pots are energy-efficient and moisture-efficient too.
• Check and reroute drainage away from your home, to minimize the moisture in and around your basement and foundation

You’ve probably heard that your home will feel warmer in winter if the humidity is higher. That’s true, and why many people use humidifiers to counteract dry, static-filled air during the heating season.

In older homes, excess moisture usually isn’t a problem because the structure “breathes” through unsealed cracks and crannies in the construction, creating a regular exchange of outdoor and indoor air. That’s why it is often a struggle to keep enough moisture inside older homes.

But with today’s modern construction techniques, homes are much tighter and energy-efficient. As a result, newer homes don’t usually need a way to add moisture – they’re more likely to have trouble getting rid of it.

There are two causes of temporary window condensation, and they normally disappear after a few weeks.

First, there is moisture that comes from new construction or re-modeling. There’s moisture in new wood, plaster and other building materials. When the heating season starts, this moisture gradually flows into the air of the home. After a few weeks, or at the most, a season of heating, this moisture will disappear.

Second, this same type of moisture can accumulate in a milder form at the beginning of each heating season. During the summer, your house absorbs moisture. After the first few weeks of heating, your home will “dry out” and you’ll have less trouble with window condensation.