If your window isn’t broken, don’t replace it.

Window defogging expels moisture from your windows for good. We back that promise with our lifetime warranty. Our services can save you 50% or more versus replacement windows. So before you sign that expensive window replacement contract, why not call us to find out if we can fix it?

Call us: (587)997-4646

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What causes “leaky seals”?

The glass panes of your windows are always in motion. Glass panes flex out in the heat of day and flex in at night as temperatures cool. Add Chinooks, and other sudden changes in temperature that Calgary is famous for, and you have the perfect recipe for foggy windows!  Here’s how the trouble starts:

Heating Phase of Windows

The inner airspace between window panes pick up heat from the sun or ambient air during the day. This increases the pressure inside of the window. As the pressure in increases, the glass flexes outward. When the pressure is high enough, some of the hot air expels through the semi-permeable seal.

Windows bow outwards when warming up.
The window heats up.

Cooling Phase of Windows

In the evening, the airspace cools. This decreases the pressure inside the unit and the glass returns to its normal position. Small amounts of air leak back into the unit to replace the expelled air. The spacer bar desiccant material sops up any of the moisture coming in from the outside air.

Windows bow inwards while cooling off.
The window cools down.

Where does the ‘fog’ come from?

The manufacturer accounts for  moisture by installing low-cost desiccant into the spacer bars. Because the amount of moisture over time is gradual, the desiccant generally holds up for ten years or more. The desiccant inevitably saturates (fails) and the airspace in the window becomes humid. When there is enough moisture to create fog, it’s time to call us!

You may have seen silica gel in your shoes!

Won’t my windows dry out on their own?

Because your window is still sealed, water continues accumulating. When the fog hits it’s dew point, it turns into water droplets. If left for too long, the droplets dissolve and corrode the the spacer bar. This dissolved material then gets baked onto the glass causing staining. These stains get will creep all over the window and bake into the glass causing permanent visual damage.  Yikes!

window with extensive silica staining
window with extensive staining.

How does window defogging work?

Step 1: Tiny holes

We grind two tiny holes in two or more corners of your window. This allows us to gain access to the airspace with minimal interruption to you. Don’t worry, the holes are very small. Most of our clients don’t know they’re there until we point them out.

Step 2: Fog-off

Our technicians enter the air space through the tiny holes and coat the glass with an eco-friendly cleaning solution. We pump the cleaning solution out of the air space. This causes an immediate improvement in the clarity of the window. In some cases we will introduce new desiccant to the air space.

Step 3: Dry Time

Remember spacer bars? They have to dry out now. We install a synthetic mesh in the holes to let moisture in the spacer bar escape rapidly. Fog will appear less and less each week until the window is dry. If there is a Chinook, the pressure and dry air draws even more moisture out! Isn’t Calgary great?

Clear Window Peace of Mind

Our lifetime warranty ensures that you will not have to worry about your view fogging up again. Defogging restores insulative R-value. The process restores the value and curb appeal of your home. With our defogging process, your peace of mind is restored!

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Learn how windows fog

Interior Moisture

If you can touch the moisture on the window (or draw in it!) chances are there is a humidity-control issue in your home. This can usually be fixed by correcting the ventilation/humidification in your home. Here are some tips:

  • A new home will typically expel 500 to 600 gallons of water in the first year and a half, so it is difficult to reduce condensation during this time.
  • It is normal to have about 1″ of moisture on a sealed unit.
    Sliders will typically have more condensation on the fixed portion due to the glass being positioned further toward the exterior than the interior.
  • Ventilation is the most effective means to remove moisture from your home. By exchanging some of the drier outdoor winter air for warm humid interior air, the moisture level inside the house will be reduced.
  • Open a door or window for short periods to allow moisture to escape
  • Gas appliances produce moisture from combustion. Cooking adds even more moisture, so be sure to run your kitchen fan while cooking. Vent the kitchen fan directly to the outside to achieve the desired effect.
  • Showers are a high source of moisture. Keep bathroom doors shut and run the exhaust fan to eliminate moisture. Ensure you leave your fan on for a minimum of 15 minutes after you shower to allow the humid air to be removed to the outside.
  • Clothes dryers should be vented to the outside. Hanging up wet clothes to dry inside your home can add significant moisture to your home.
  • Shut off the furnace humidifier and any other humidifying device in the home, particularly in winter months.
  • If you have a fireplace, open the damper occasionally to allow moisture to escape.
  • Free air circulation is important. Do not cover hot or cold air registers with furniture or appliances. Leave bedroom and bathroom doors open.
  • Keep the temperature of all rooms at a minimum of 10ºC (50ºF) even if unoccupied. Condensation will occur in an unheated room.
  • Condensation will typically be greater on the second floor due to the fact that warm air rises and the upper floors are exposed to greater winds, cooling the glass
  • Wipe up any tracked-in snow before it melts and evaporates.
  • Floors wet from mopping can add large amounts of moisture.
  • Run exhaust fans (bathroom and kitchens) while floors are wet.
  • Avoid washing floors on extremely cold days.
  • Most builders install a fresh air intake into the cold air return duct of the heating system. Make sure that the intake damper is open and that there are no obstructions to prevent airflow. If you do not have a fresh air intake, have one installed.
  • Drapes and blinds should be left open during the daytime. At night, raise blinds at least 4” up (preferably 6-8″) off the frame to allow air to flow against the glass.
  • Certain fabric blinds that are designed to fit from jamb to jamb must be left partially open to ventilate the window cavity. Failure to do this can cause extreme temperatures between the blinds and the glass. Glass breakage or warping of PVC can occur, which can void warranties.
  • Remove casement screens to increase airflow.


A great guy

Jeff helped us to a huge saving. Without his help we would have gone in and would have installed new windows. Thanks Jeff


Good service

Side by side window comparison of a foggy window and a defogged window.

I have a wood frame window from 1992 when the house was built and it was fogging up constantly and the frame was starting to deteriorate. Jeff came and flushed out the window and the fog went away after a couple of days. I would recommend Jeff to anyone who has a foggy window.

Oscar Chen

Firstly, I’m thrilled that I don’t have to purchase a new window! On time, professional and loved all the explanations as to what the heck you were doing. I highly recommend this company. Thank you Jeff for excellent service.

Jodi Sheppard

The window had been fogged

The window had been fogged for a number of years. The process resulted in a noticeable improvement, with most of the discolouration removed. We were very happy with the service and the end result.

D Dowler

Excellent service & reasonably priced!

Can’t believe I can see clearly out of my windows again. I recommend this company. Excellent service & reasonably priced!

Marlene Perkins