Drafty Windows in Alberta: When to Fix and When to Replace

Last February, a homeowner in Bonnie Doon told us she had been putting plastic film over her living room windows every fall for six years. She spent $30 on the film kit each year, taped it up in October, pulled it down in April, and accepted that her living room would always feel cold near the windows.

She finally called us when she noticed condensation between the glass panes, not on the inside surface, but trapped inside the sealed unit. That was not something plastic film could fix. The seals had failed, the argon gas was gone, and the windows were essentially single-pane performance at that point.

But here is the thing: not every drafty window needs a full replacement. Some problems are genuinely fixable for $15 and twenty minutes of work. The trick is knowing which situation you are in.

Quick Fixes That Actually Work

Before assuming you need new windows, try these. They solve specific, common problems and cost almost nothing.

Weatherstripping Replacement ($5-$15 per window)

What it fixes: Air leaks around the edges where the sash meets the frame. You can feel these as a cold draft when you hold your hand near the window edge, not the glass, the frame junction.

How to check: On a cold day, hold a lit candle or incense stick near the window edges. If the flame flickers or the smoke moves, air is getting through.

The fix: Peel off the old weatherstripping (it is usually compressed, cracked, or missing entirely on windows older than 10 years). Replace with self-adhesive V-strip or foam tape from any hardware store. This takes 15-20 minutes per window and makes a noticeable difference.

When it will NOT help: If the draft comes from the glass surface itself (cold radiation, not air movement) or if the frame is warped and no longer makes a flush seal.

Window Caulking ($5-$10 per window)

What it fixes: Gaps between the window frame and the wall, specifically the junction where the window unit meets the rough opening. Over time, old caulking dries, cracks, and separates, letting cold air bypass the window entirely.

How to check: Look at the caulking on both interior and exterior sides. If you see cracks, gaps, or sections where the caulking has pulled away from the surface, that is your air leak.

The fix: Remove old caulking with a utility knife, clean the surface, and apply a new bead of silicone or polyurethane caulking. Use exterior-grade caulking rated for -30C on the outside.

When it will NOT help: If the gap is larger than about 6mm, or if the window frame has shifted so much that the gap opens and closes with temperature changes. That is a structural issue, not a caulking issue.

Window Film ($15-$25 per window)

What it fixes: Radiant heat loss through the glass. Window film creates an additional air pocket in front of the glass, acting like a poor person's extra pane.

How to check: If you can feel cold radiating off the glass surface even when there is no air leak around the edges, the glass itself is losing too much heat.

The fix: The heat-shrink film kits from hardware stores work reasonably well. Apply the double-sided tape to the frame, stretch the film over the window, and use a hairdryer to shrink it taut.

What it does NOT fix: Window film is a band-aid. It reduces heat loss by maybe 10-15%, and it needs to be reapplied every fall. It does not fix seal failure, frame problems, or condensation between panes. If you have been doing this for more than two winters in a row, it is time to consider whether the ongoing hassle and cost add up to more than just doing the replacement.

Signs That Quick Fixes Will Not Help

Here is where the decision gets real. These symptoms mean the window itself has failed, not just the seals around it, and no amount of weatherstripping or film will solve the underlying problem.

Condensation Between the Panes

This is the single clearest sign of window failure. When you see moisture, fogging, or a milky haze between the two (or three) panes of glass, the sealed unit has failed. The argon gas that was insulating the space has leaked out and been replaced by moist air.

A window with failed seals has roughly the thermal performance of a single-pane window. No quick fix addresses this. The insulated glass unit (IGU) needs replacement, or the entire window does.

Cost to fix: IGU replacement is $150-$300 per window. Full window replacement is $800-$1,500 per window. If the frame is sound, IGU swap can make sense. If the frame is old, warped, or wood, go with full replacement and do not spend money on glass that is going into a failing frame.

Frame Warping or Rot

Run your hand along the frame. Does it feel uneven? Do the corners have gaps? On wood frames, press the wood with a screwdriver. If it gives, there is rot underneath the paint.

Warped frames cannot be weatherstripped back into a tight seal. The geometry is wrong and no flexible material compensates for a frame that has twisted. Rotted frames are structurally compromised and will only get worse.

Windows That Will Not Open, Close, or Lock

If your windows stick, jam, or will not lock fully, the frame or hardware has shifted. Sometimes this is a hardware fix ($50-$150 for a new crank mechanism or lock). But if the frame itself has warped, especially on older wood or aluminum frames, the hardware will keep failing because it is compensating for a structure that is no longer square.

Single-Pane Glass

If your home still has original single-pane windows, there is no fix short of replacement. Single-pane glass has essentially zero insulating value. It is one piece of glass between your living room and -30C air. Weatherstripping the edges helps with air leaks, but the glass itself is a thermal sieve.

Any home in Alberta with single-pane windows is overpaying for heating by a significant margin. This is the one situation where we say: do not try to fix it, replace it.

The Cost of Doing Nothing: Real Numbers

"I will replace them next year" is the most expensive decision Alberta homeowners make about their windows. Here is what procrastination actually costs.

Monthly Energy Penalty

A home with 12 old windows (failed double-pane or single-pane) versus the same home with new triple-pane vinyl windows:

Month	Extra Heating Cost (Old vs New Windows)
October	$20 - $35
November	$40 - $60
December	$55 - $80
January	$60 - $85
February	$55 - $75
March	$35 - $55
April	$15 - $25
Annual Total	$280 - $415

These numbers are based on current ATCO gas rates (approximately $6.50/GJ), a 95% efficiency gas furnace, and Edmonton's 5,708 heating degree days. Your actual numbers will vary, but the pattern is consistent: old windows cost you real money every month from October through April.

The 5-Year Procrastination Tax

If you put off replacement for 5 years, you are paying an extra $1,400 to $2,075 in heating bills alone. Add in the cumulative moisture damage from condensation (wood trim rot, paint failure, potential mould in the wall cavity), and the real cost of waiting is higher still.

Compare that to the price of new windows (typically $9,000 to $15,000 for a 12-window project installed) and it is clear that the longer you wait, the worse the economics get. See our Alberta cost guide for a full pricing breakdown.

The Fix vs Replace Decision Framework

Here is the simple framework. For each window in your home, answer these four questions:

1. Where is the cold coming from?

• Frame edges only (air leak) -> Fix: weatherstripping + caulking
• Glass surface (cold radiation) -> Assess: how old is the glass?
• Between panes (seal failure) -> Replace: IGU or full window

2. What is the frame condition?

• Sound, no warping, no rot -> Fix-friendly: repairs make sense
• Minor weathering, cosmetic issues -> Fix: paint and seal
• Warped, rotted, or will not close square -> Replace: repairs are temporary at best

3. How old are the windows?

• Under 10 years with minor issues -> Fix: likely still has life
• 10-20 years with multiple issues -> Case-by-case: calculate repair cost vs. replacement
• Over 20 years -> Replace: even if they look okay, the technology gap means you are overpaying for heating

4. How many windows have problems?

• 1-2 windows with isolated issues -> Fix: targeted repairs are cost-effective
• 3-5 windows with mixed issues -> Partial replacement: replace the worst ones now
• 6+ windows with problems -> Full replacement: volume pricing makes it the smart financial move

When Partial Replacement Makes Sense

Not everyone needs to replace every window at once. Sometimes the right call is replacing the 4-5 worst windows now and addressing the rest in a year or two.

Partial replacement works when:

• A few specific windows are clearly failing while the rest are in reasonable shape
• Budget is a real constraint (our financing options help, but sometimes phasing makes more sense)
• Only north-facing or most-exposed windows are problematic

Full replacement makes more sense when:

• More than half your windows show issues
• Your windows are all the same age (if 5 failed, the rest are close behind)
• You want the volume pricing advantage (per-window cost drops 10-15% on larger projects)
• You are planning to sell within the next few years and want the full curb appeal upgrade

Next Steps

If you have worked through the framework above and landed on "replace" for some or all of your windows, here is the path forward:

1. Get a professional assessment. We will look at every window in your home and give you an honest read on which ones need replacement and which ones can wait. No charge, no pressure.

2. Understand your quote. Make sure the quote itemizes everything. Our guide on getting a transparent quote walks you through what to look for.

3. Consider timing. If your windows are costing you money right now, our winter installation guide explains why you do not need to wait for spring.

4. Understand the upgrade. If you are moving from old double-pane to new windows, our triple-pane vs double-pane comparison has the real energy math for Alberta's climate.

We replace windows across Edmonton, Calgary, and Alberta communities year-round. Whether you need two windows or twenty, the consultation is free, the quote is detailed, and there is zero pressure to decide on the spot.

Check customer reviews from homeowners who have been through the process, then book a free consultation when you are ready.