Patio Door Thermos Replacement Montreal Fogged Glass Fixed
Fogged glass between your patio door panes? You do not need to replace the entire door. We replace only the defective thermos glass unit and restore your clear view with brand-new thermal insulation.
Is your glass fogged? Here are the confirming signs:
Permanent fog between the panes
Condensation is trapped between the two glass panels. Impossible to clean from the outside.
Loss of thermal insulation
Feeling cold near the door? The thermos seal is broken, the argon gas has leaked out.
Water stains or mold
Green or brown spots between the panes? That is stagnant moisture attacking the frame.
Reduced visibility
Your garden or city view is blurry? The thermos is saturated with permanent condensation.
Why does a thermos unit fog up?
A thermos unit consists of two glass panes separated by a sealed air or argon chamber. Over time, the seal degrades due to temperature swings, humidity, and aging. Moist air penetrates the chamber and condenses on the inner glass surface.
In Montreal, extreme temperature swings between winter and summer accelerate this process. A fogged thermos cannot be repaired — it must be replaced. Fortunately, replacing the glass unit is 3 to 5 times cheaper than replacing the entire door.
Our solution: custom thermos replacement
We take precise on-site measurements of your patio door and order a new thermos unit with matching specs: thickness, UV treatment, tint, and gas type (argon or krypton). Delivery takes 5-10 business days, then installation lasts about 60 minutes.
The new thermos is guaranteed 10 years against any internal condensation. You immediately regain optimal thermal insulation, reducing winter heating bills by 10-15%. And most importantly, you enjoy a perfectly clear view of your outdoor space again.
Technicians Specialized in Your Patio Door Type
Every technician on our team is specifically trained on patio door and sliding door systems. We are not general contractors — we do one thing, and we do it better than anyone in Montreal.
Our parts stock covers the main brands installed in Quebec: Novatech, Gentek, Ostaco, Alumipro, and many more. This means in most cases, we repair your door in a single visit without having to order parts.
A 1-Year Warranty on All Our Services
We have enough confidence in our work to offer a full 1-year warranty on all replaced parts and labor. If the same problem reappears within 12 months, we come back free of charge.
This warranty covers rollers, thermos units, locks, handles, weatherstrips, and screens. Your peace of mind is included in the price — no hidden fees, no fine print.
Price Range
Average price in Montreal
$350 – $750
Price depends on glass dimensions, glass type (standard, Low-E, tinted), and number of panels to replace. Precise quote after measurement.
What Our Clients Say
"I called for fog between my two glass panes. The video diagnosis was convenient, the quote honest. In one hour, my view was perfectly clear again. Great work!"
"We replaced both thermos units on our double door. Insulation is noticeably better, we feel less cold near the door. And the view is back!"
"I was hesitating to replace the whole door. Luckily, thermos replacement alone cost me 4 times less. Quick service, skilled technician."
FAQ — Patio Door Thermos Replacement Montreal
How long does thermos replacement take?
Measurement and diagnosis take 20 minutes. Custom glass delivery is 5-10 business days. The installation itself takes about 60 minutes per panel.
Do both panes of a double door need replacement?
No, only the fogged pane needs replacing. However, if both thermos units are the same age, we recommend replacing them together for uniform thermal performance and to avoid a second service call.
Is the new thermos more efficient than the original?
Yes, we use current-technology glass with Warm-Edge spacers and high-purity argon gas. Their thermal performance often exceeds that of the original glass, even when it was new.