If you’re trying to figure out how to fix drafty windows in Delaware County homes, start by identifying where the air is getting in. Small gaps around the sash or frame can often be improved with new weatherstripping, caulk or window-film insulation. But if the window has deteriorated frames, failed seals, damaged components or significant air leakage, replacement may be the better long-term solution.

Drafty windows are especially noticeable during southeastern Pennsylvania’s cold winters and hot, humid summers. Beyond making a room uncomfortable, air leakage around older windows can force your heating and cooling system to work harder to maintain a consistent indoor temperature.

For homeowners in Havertown, Media, Springfield, Drexel Hill, Broomall, Swarthmore and surrounding Delaware County communities, here’s how to determine what’s causing your draft — and whether you can fix it or it’s finally time to replace the window.

How Do You Fix a Drafty Window?

The right fix depends on where the draft is coming from and why the window is leaking air.

For minor drafts, homeowners may be able to:

• Replace worn weatherstripping
• Caulk gaps around the window frame
• Add temporary window insulation film
• Install or adjust a storm window
• Repair minor hardware problems

However, these solutions won’t correct every problem.

If the window itself is warped, rotting, damaged, poorly installed or no longer sealing correctly, adding another bead of caulk may simply cover up a larger issue.

A useful rule of thumb is this:

If air is entering around an otherwise solid window, weather-sealing may solve the problem. If the window or its installation is failing, repair or replacement is usually the more effective long-term solution.

Let’s look at the most common causes.

1. Find Out Where the Draft Is Coming From

Before buying caulk or ordering replacement windows, identify the source of the air leak.

On a cold or windy day, slowly move your hand around:

• The window sash
• Where the sash meets the frame
• The interior trim
• The sill
• The perimeter of the window
• Locks and meeting rails

If you feel cold air in one specific location, you’ve narrowed down the problem.

You can also visually inspect the window for daylight around the frame, deteriorated caulk, damaged weatherstripping or areas where the sash no longer closes tightly.

Be careful with the popular “candle test.” Holding an open flame near curtains, blinds, wood trim or other combustible materials isn’t necessary. Your hand or a purpose-made draft detector can help locate significant air movement without introducing a fire risk.

2. Replace Worn Weatherstripping

If the draft is coming from where the movable portion of the window meets the frame, worn weatherstripping may be responsible.

Weatherstripping creates a tighter seal while still allowing the window to open and close.

Over years of use, it can:

• Compress
• Tear
• Crack
• Peel away
• Become brittle
• Lose its ability to seal

Replacing deteriorated weatherstripping can be an inexpensive solution for a window that’s otherwise in good condition.

The important part is using the correct type and thickness. Weatherstripping that’s too thin won’t stop the leak; material that’s too thick may prevent the window from closing or locking properly.

3. Caulk Gaps Around the Window Frame

If air is coming from the stationary area around the window rather than between the sash and frame, inspect the caulk.

Caulk helps seal joints where different building materials meet. As it ages, it can shrink, crack or pull away from the surface.

Look for gaps around the window’s interior and exterior perimeter.

Small gaps may be resealed using a caulk appropriate for the application and material.

But there’s an important distinction:

Caulk should seal appropriate joints — not compensate for a badly installed or deteriorating window.

If you find large gaps, water damage, rotted wood or significant movement around the frame, simply covering the area with caulk may hide the symptom without addressing the underlying problem.

4. Use Window Insulation Film as a Temporary Fix

Plastic window insulation kits can help reduce drafts during the winter.

These kits typically use clear plastic film that’s applied around the interior window trim and tightened with heat.

For homeowners dealing with an uncomfortable room during a Delaware County winter, this can be a useful short-term solution.

It’s particularly helpful for:

• Older windows
• Rarely opened windows
• Spare bedrooms
• Rental properties
• Homeowners waiting for replacement windows

But window film is exactly that — temporary.

If you need to reinstall plastic every winter to make a room comfortable, it’s worth investigating why the window is leaking so much air in the first place.

5. Check Whether the Window Is Closing and Locking Correctly

Sometimes a “drafty window” is simply a window that isn’t sealing completely.

Open the window and inspect the tracks and hardware.

Look for:

• Dirt or debris preventing closure
• Loose locks
• Misaligned hardware
• A sash that’s no longer sitting squarely
• Damaged balances or other components
• Warping

Window locks don’t exist only for security. On many window designs, locking the window also pulls components together more tightly to create a better seal.

If your window appears closed but isn’t properly seated or locked, correcting the issue may noticeably reduce air leakage.

6. Inspect Older Wood Windows for Rot or Deterioration

Delaware County has plenty of older housing stock, and older wood windows can add considerable character to a home.

But wood requires maintenance.

Over time, moisture exposure can contribute to peeling paint, soft wood, rot and deterioration around windows.

Pay particular attention to:

• Window sills
• Lower corners of the frame
• Exterior trim
• Areas where water collects
• Discolored or soft wood

Minor deterioration may sometimes be repairable.

Extensive rot is a different story.

If portions of the window or surrounding structure have deteriorated substantially, a contractor should determine the extent of the damage before you simply seal or cover the affected area.

7. Check for Failed Insulated Glass Seals

Not every uncomfortable window is technically “drafty.”

Modern double- and triple-pane windows contain multiple panes of glass separated by a sealed space. Depending on the window, this space may contain insulating gas.

When that seal fails, you may notice:

• Fogging between the panes
• Condensation inside the glass unit
• A hazy appearance that won’t wipe away
• Reduced insulating performance

Caulking around the outside of the window won’t repair a failed insulated glass unit.

Depending on the age, construction and condition of the window, replacing the glass unit may be possible. In other situations, replacing the complete window may make more sense.

8. Consider Whether the Window Was Improperly Installed

You can buy an excellent window and still end up with drafts if it isn’t installed correctly.

The opening around the window needs to be properly measured, fitted, insulated, flashed and sealed.

Problems around the rough opening can allow outside air to travel around the window assembly — even when the window itself is functioning normally.

This is why professional installation matters.

If several relatively new windows feel drafty, the issue may not necessarily be the windows themselves. Installation should be part of the diagnosis.

Why Are Drafty Windows Common in Older Delaware County Homes?

Many communities throughout Delaware County have homes built decades before today’s energy-efficiency standards and construction practices.

In places like Havertown, Drexel Hill, Springfield, Media and Swarthmore, homeowners may be dealing with older wood windows, previous replacement windows, aging trim or decades of repairs and renovations.

As a house ages, materials move.

Wood expands and contracts. Caulk deteriorates. Weatherstripping wears out. Moisture can damage framing. Previous renovations can also introduce their own issues.

That doesn’t mean every old window needs to be replaced.

In fact, some older windows can remain functional with appropriate maintenance and repairs.

The goal should be to determine whether you’re dealing with a maintenance issue or a window-performance issue.

Should You Repair or Replace Drafty Windows?

This is usually the biggest question.

Repair may make sense when:

• The window is structurally sound
• The glass and frame are in good condition
• Weatherstripping is worn
• Caulk has deteriorated
• Hardware needs adjustment
• The draft is isolated and minor

Replacement may make more sense when:

• Frames are rotting or badly deteriorated
• Windows are difficult to open or close
• Multiple seals have failed
• Significant drafts continue after sealing
• The windows are extremely old or inefficient
• Several windows throughout the home have similar problems
• The existing installation is inadequate
• You’re already planning a larger exterior renovation

You don’t need to replace a good window because of one deteriorated strip of weatherstripping.

On the other hand, continually spending money patching windows that are reaching the end of their useful life may not be the best investment either.

Will New Windows Make My Delaware County Home More Energy Efficient?

Properly selected and installed replacement windows can improve a home’s thermal performance and reduce unwanted air leakage.

Modern energy-efficient windows may include features such as:

• Double- or triple-pane glass
• Low-emissivity (Low-E) coatings
• Insulated frames
• Improved weatherstripping
• Better locking and sealing systems
• Insulating gas between glass panes

But the window itself is only part of the equation.

Installation quality matters tremendously.

A high-performance window installed with gaps around the frame won’t perform like it should.

Cumming Construction installs replacement windows throughout Delaware County with an emphasis on proper fit, weatherproofing and long-term performance.

What Type of Replacement Window Is Best for Pennsylvania Homes?

There’s no single window that’s right for every Delaware County home.

Your decision should consider the home’s architectural style, exposure, existing openings, budget and maintenance preferences.

Common options include:

• Vinyl windows: Popular because they’re low-maintenance, relatively affordable and available with energy-efficient glass packages.
• Wood windows: Often chosen for their traditional appearance and ability to complement older or architecturally distinctive homes.
• Double-pane windows: A common energy-efficient upgrade over older single-pane glass.
• Triple-pane windows: Provide an additional layer of insulation but may not be necessary or cost-effective for every project.
• Low-E glass: Uses a specialized coating designed to reduce unwanted heat transfer while allowing natural light into the home.

The best window is the one that balances performance, appearance, maintenance and budget for your particular house.

Don’t Forget About Drafty Doors

If you’re investigating air leakage around your home, check exterior doors too.

Entry doors, patio doors and sliding glass doors can develop many of the same issues as windows:

• Worn weatherstripping
• Gaps around frames
• Damaged thresholds
• Poor alignment
• Failed seals
• Deteriorated components

Cumming Construction handles both window and door installation and replacement, making it possible to address multiple sources of exterior air leakage as part of the same home improvement project.

Window Replacement in Delaware County, PA

If temporary fixes aren’t solving your drafty-window problem, it may be time to have the windows professionally evaluated.

Cumming Construction is based in Havertown, PA, and has served homeowners in Delaware County and the surrounding Philadelphia suburbs since 1999. The company provides professional window and door installation and replacement, including energy-efficient options designed to improve comfort, insulation and the appearance of the home.

Cumming Construction serves homeowners throughout Delaware County, including communities such as:

• Havertown
• Media
• Springfield
• Swarthmore
• Drexel Hill
• Broomall
• Upper Darby
• Ridley Park
• Newtown Square
• Surrounding Delaware County communities

Whether you’re dealing with one stubborn draft or considering replacement windows throughout your home, the goal should be the same: solve the source of the problem rather than repeatedly covering up the symptom.

Contact Cumming Construction to discuss window and door replacement options for your Delaware County home.

Frequently Asked Questions About Drafty Windows

Why do I feel cold air coming through my windows?

Cold air around a window can result from worn weatherstripping, deteriorated caulk, gaps around the frame, improper installation, damaged window components or an aging window that no longer seals properly.

What is the cheapest way to fix drafty windows?

For minor air leaks, replacing weatherstripping or sealing appropriate gaps with caulk can be relatively inexpensive. Window insulation film can also reduce winter drafts temporarily. The correct solution depends on where the air is entering.

Can you fix drafty windows without replacing them?

Yes, sometimes. If the window is structurally sound and the problem is caused by worn weatherstripping, deteriorated caulk or minor hardware issues, repairs may significantly reduce drafts. Windows with extensive deterioration, poor installation or other major defects may need replacement.

Does putting plastic over windows really help with drafts?

Interior window insulation film can reduce air movement and heat loss during cold weather, making it a useful temporary winter solution. It doesn’t repair the underlying problem causing a window to leak, however.

Why are my windows drafty even though they’re closed?

A closed window can still leak air if its weatherstripping is worn, the sash isn’t properly aligned, the lock isn’t pulling the window tightly closed or gaps exist around the frame or installation.

How do I know if my window seals are bad?

Condensation or fog trapped between panes of glass can indicate that an insulated glass seal has failed. If moisture is simply appearing on the room-facing surface of the glass, indoor humidity and surface temperature may be responsible instead.

Is it worth replacing old windows in Delaware County, PA?

Replacement may be worthwhile when windows are significantly deteriorated, consistently drafty, difficult to operate or performing poorly. New energy-efficient windows can also improve comfort, appearance and ease of operation when properly installed.

What windows are best for older homes in Delaware County?

The right window depends on the architecture and condition of the house. Homeowners may choose vinyl for lower maintenance or wood when preserving a traditional appearance is a priority. Glass performance, installation quality and fit should also factor into the decision.

Can drafty windows increase heating costs?

Air leakage can make it harder for your home to maintain a comfortable temperature, requiring the heating system to compensate for unwanted cold-air infiltration. Sealing significant leaks or replacing poorly performing windows can improve the home’s overall thermal performance.

Who replaces drafty windows in Delaware County, PA?

Cumming Construction provides professional window and door installation and replacement from its Havertown location, serving homeowners throughout Delaware County and surrounding southeastern Pennsylvania communities.

Ready to Stop Living With Drafty Windows?

A little weatherstripping may be all you need — or those persistent drafts may be telling you that your windows are ready for an upgrade.

If your windows are cold, difficult to operate, deteriorating or constantly need temporary fixes, Cumming Construction can evaluate your window and door replacement options in Delaware County, PA.

With more than 25 years serving local homeowners, Cumming Construction understands both the character of Delaware County homes and the importance of upgrades that improve efficiency without compromising the home’s appearance.

Contact Cumming Construction in Havertown to schedule a consultation for window or door replacement in Delaware County.