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AfterDrafty Windows Raising Energy Bills
Drafty windows are almost always caused by one of three things: failed weatherstripping that no longer seals the sash, a broken seal between the glass panes that lets conditioned air transfer through, or an out-of-plumb frame that has shifted enough over the years to open a gap the original install never had. In most cases, a qualified technician can diagnose the exact cause in a single visit and tell you in writing what it will take to fix it before any work begins.
The draft you feel standing next to that window is not just uncomfortable. It means your heating or cooling system is running longer to compensate for what is bleeding out through the glass or the frame. Over a full season that adds up, and the older the window, the worse it gets. Most homeowners we talk to have noticed the draft for a while before they looked up what to do about it. That wait is understandable, but the problem rarely improves on its own.
Why It Happens
Weatherstripping Has Worn Out
Weatherstripping is the foam, rubber, or felt material that lines the edges of a sash and presses against the frame when the window closes. It compresses and rebounds thousands of times over its life, and eventually it stops rebounding. When that happens, air moves freely around the sash even when the window is latched. You can tell this is the culprit by closing the window on a thin strip of paper and trying to pull it out. If it slides out with no resistance, the seal is gone. You might also see visible gaps, cracking, or flattened material along the edges.
The Insulating Glass Seal Has Failed
Most windows made in the last thirty years use two or three panes of glass with an inert gas layer sealed between them. That gas layer is what does the real insulating work. When the seal around the edge fails, the gas escapes and outside air essentially fills the cavity. You can usually spot this from a foggy or hazy appearance between the panes that does not wipe off. The window may not feel as obviously drafty as one with failed weatherstripping, but it is transferring heat and cold across the glass just as efficiently as a single-pane window from 1968.
The Frame Has Shifted Out of True
Wood frames absorb moisture and swell. Vinyl frames can rack slightly as a house settles. Either way, a frame that is no longer square creates gaps the original weatherstripping was never designed to cover. If your window suddenly drafts worse in a humid season, or if the sash has become harder to open and close than it used to be, the frame may have moved on you. A technician will check plumb, level, and square before drawing any conclusions – that is where the diagnosis starts.
The Original Install Was Never Done Right
This one is more common than people expect. A window that was set slightly out of plumb at install, or that was caulked on the exterior without proper flashing, can take years before the symptom shows up clearly enough to notice. By then the original contractor is long gone. If the draft is concentrated in one corner of the frame – often the bottom corner opposite the hinge – an out-of-true original install is worth putting on the list of suspects. Dale Kessler kept a level in his truck door for exactly this reason, and every TruePane technician carries one today.
What to Do Right Now
- Hold your hand near the edges of the frame, not just the glass. Move slowly around the full perimeter – corners, top, bottom, both sides. Note exactly where the draft is strongest, because that location tells a technician a great deal about the cause. Take a short video or a few photos while you are at it.
- Try the paper-pull test on the weatherstripping. Close the sash on a thin piece of paper and pull. No resistance means the seal is gone at that point. Work around the full sash and note where it fails.
- Look at the glass itself from different angles in daylight. Fogging, condensation, or a hazy film between the panes that does not change when the temperature changes inside is the signature of a failed glass seal.
- Apply a temporary rope caulk in a bad gap if you need relief before we arrive – it peels off cleanly and will not damage the frame. Do not use permanent caulk. It can hide the underlying cause and make a proper diagnosis harder.
- Do not attempt to adjust the frame yourself if the window has not been opening and closing smoothly. A frame that has racked may have structural reasons behind it. Forcing the sash or prying at the frame can damage the hardware and create a larger repair. Photograph what you see and let a trained technician assess it first.
How We Fix It
When your local TruePane Windows & Doors team arrives, the technician measures the opening – plumb, level, square – before touching anything else. That single step tells us whether the frame itself is the source or whether the problem lives in the weatherstripping or the glass unit. From there, the path depends on what the inspection shows.
If it is weatherstripping, we replace it with material matched to your sash type and retest the seal before we leave. If the glass unit has failed, we discuss whether a glass-unit replacement or a full window replacement makes better sense for your home’s age and the condition of the surrounding frame – you get both options laid out in writing, side by side, so the decision is yours. If the frame is the root cause, we may recommend a full window installation with a properly trued rough opening, and we register both warranty layers in writing before the truck leaves the driveway.
Most single-window repairs are completed in one visit. Our pricing is upfront, stated in full before work begins, and backed by the Done Right Promise. If it is not right, we come back. No paperwork. No arguing.
Frequently Asked Questions
A draft that has been there for a few weeks is unlikely to cause structural damage overnight, but it is causing ongoing energy loss every day the heater or air conditioner runs. The more serious risk is moisture. A failed seal or a gap in the frame lets humid air in, and over time that moisture can work into the sill, the rough framing, or the wall cavity and cause rot or mold well before you notice it from the inside. Getting it looked at sooner rather than later is the sensible call. You can reach our team anytime at (888) 635-0804 – a live person answers every call.
A drafty window itself is not a safety emergency the way a gas leak or a failing electrical panel would be. That said, if the frame has racked badly enough to prevent the window from latching or closing fully, you have a security issue as well as an energy issue, and that moves it up the priority list. Call (888) 635-0804 and describe what you are seeing – we will help you figure out how urgent the visit needs to be.
Your local TruePane Windows & Doors team works to get to you as quickly as the schedule allows, and we will tell you honestly what that looks like when you call. What we will not do is promise a time we cannot keep – that is the kind of thing that gets argued about later, and we are not in that business. Call (888) 635-0804 and we will find the nearest available appointment for your area.
That depends entirely on what the inspection shows, and we cannot tell you honestly until we measure the opening and look at the glass unit and the frame. Many drafts are fixed with new weatherstripping or a glass-unit swap. Others turn out to have a frame that has moved enough that a new weatherstrip will not hold – and in that case we explain why in plain terms and give you a written quote for the replacement option. No pressure either way. You see the numbers on paper before anything starts, and the decision is yours.
Get It Fixed
Call (888) 635-0804 – a live person answers around the clock – and your local TruePane Windows & Doors team will schedule an inspection, diagnose the cause, and hand you a written estimate before any work begins. No obligation to proceed. No surprises on the bill if you do.
Written by Dale Kessler, Owner at TruePane Windows & Doors, serving local communities since 2008.
What Our Customers Say
"French doors to the patio, custom size because this house was built in 1961 and nothing is standard. Measured twice, three weeks to fabricate like they warned, and the install day they laid runners over my floors without being asked."
- Marie S."Our bay window had rotted at the sill and two other outfits wanted to talk us into a flat picture window instead. TruePane rebuilt the opening and matched the original look. Neighbors have knocked on the door about it."
- Gene A."Two entry doors. Showed up when they said, second day was a half day like they said, and the painter they recommended confirmed the frames were dead plumb. The financing was explained in actual dollars, not a brochure."
- Janet R.