
Local service
Thermos replacement in Saint-Constant
Your Saint-Constant glazier for thermos glass replacement: we replace only the sealed unit in your existing frame — custom glass, free assessment, transparent pricing.
Local expert
Your thermos specialist in Saint-Constant
Fog between the panes means the seal on your thermos has failed. In Saint-Constant, the large number of homes built during the Roussillon's residential expansion explains why so many thermos units are fogging up today.
Good news: there's no need to replace the whole window. We replace only the faulty sealed unit in the existing frame, with custom-cut glass.
Custom glass for non-standard sizes, free assessment, transparent pricing from $150.

Local context
Saint-Constant: thermos units in Roussillon homes
Saint-Constant has grown largely as a residential town on Montreal's South Shore. Single-family homes and semi-detached houses make up most of the housing, joined more recently by townhouses and condos near the main transit routes. Sliding and casement windows and patio doors are the norm, often in fairly standard sizes in neighbourhoods built by a single developer, which can make measuring quick.
On the flat, open land typical of the Roussillon area, homes catch the full force of the wind and direct sun on their back walls. Large patio doors feel those swings more than any other opening: the seal gives way and the glass fogs up. We replace them with a tempered-glass sealed unit, adding argon and Low-E to cut heat loss in winter and heat gain in summer.
Many homes here still have their original windows, so if one unit fogs, others from the same batch may follow. During the free assessment we check them all and give you a clear picture, with no pressure to replace everything. In a condo, check with your syndicate before any work, since windows sometimes count as common property. Getting here is easy via Route 132 or Highway 30.
Areas served
- Downtown Saint-Constant
- Train station area
- Exporail area
- Route 132 corridor
- Highway 30 corridor
Why it happens here
Saint-Constant: why your windows fog up
Wind on open ground
The flat Roussillon landscape exposes walls to wind and temperature swings.
Same-batch windows
When one original unit fogs up, its neighbours are ageing at the same pace.
Tempered patio doors
Large backyard units replaced in tempered glass, with argon and Low-E.
Condos & syndicates
A useful reminder: check with your condo board before replacing a unit.
Our services
Our services in Saint-Constant
Thermos replacement
We replace the failed sealed unit inside your existing frame — no need to change the whole window.
Learn moreFoggy glass / condensation between panes
Diagnosis of permanent fogging between panes and sealed unit replacement.
Learn moreGlass & window repair
Broken or cracked glass? Fast on-site glass replacement, all sizes.
Learn moreDouble & triple glazing
Upgrade your insulation with a double or triple argon-filled sealed unit.
Learn morePatio door & French door
Sealed unit replacement for your sliding and French doors.
Learn moreCustom glass & mirrors
Custom-cut glass and mirrors for all your applications.
Learn moreCommercial glazing
Glazing solutions for shops, offices and buildings across Greater Montreal.
Learn moreNeighbouring areas
We also serve nearby areas
Simple and fast
How it works in Saint-Constant
Call or photo
Send a photo of your foggy window or call us — we'll guide you.
Diagnosis & measurement
We measure your sealed unit and confirm the diagnosis, free of charge.
Custom fabrication
Your sealed unit is custom-made and ready within 24 to 72 hours.
Guaranteed installation
Clean installation with a written warranty included.
FAQ
Questions about Saint-Constant
Do you serve Saint-Constant?
Yes, we work throughout Saint-Constant, from the new neighbourhoods to the established residential areas. The assessment and travel are free.
What are the turnaround times in Saint-Constant?
The assessment is done quickly on site, then your thermos is custom-made in 24 to 72 hours.
Do you replace thermos units in houses?
Yes, we cut custom glass to the exact dimensions of your windows and install it in the existing frame.
All my windows are original — do I need to replace them all?
No. We only replace units that are foggy or broken. The free assessment helps spot the ones showing signs of wear, so you can plan the rest at your own pace and on your own budget.
My patio door fogged up in the middle of winter — what now?
A foggy unit insulates less well, but the door is still usable. Book the free assessment: the new tempered-glass unit is custom-made in 24 to 72 hours, then installed in the existing frame without replacing the door.

Ready for clear windows again?
Free quote, honest diagnosis and transparent pricing. Call us or request your quote now.
Request your free quote
Fast response, no obligation. The diagnosis is always free.