Most people think of winter prep as furnace servicing and pipe insulation. Windows rarely make the list. But glass, frames, and seals are all sensitive to temperature extremes, and what you do — or don't do — in October shows up clearly by February. We've developed a three-step pre-winter protocol from working on homes across Utah, Colorado, and Arizona, including everything from standard vinyl double-panes in Lehi subdivisions to historic single-glazed wood windows in Park City's older neighborhoods.
Step one is a thorough exterior clean before the first hard freeze, ideally in October. The summer's accumulation of hard water deposits, pollen, and UV-degraded grime needs to come off because frozen contaminants expand and contract with the glass, accelerating micro-cracking and seal failure. The cleaning process itself matters here — hot water on cold glass causes thermal shock, and standard tap water in most Utah municipalities leaves mineral residue that actually freezes into the glass surface. A warm-water deionized rinse avoids both problems. While cleaning, it's worth inspecting each window's weather stripping, glazing compound, and frame seal for gaps that would let moisture in during winter.
Step two: check for interior condensation. Moisture on the inside surface of your windows during winter typically means one of two things — a failed IGU (insulated glass unit) seal or too much indoor humidity. Both are fixable, but catching them early matters. A failed seal shows up as fogging between the panes, and it reduces the window's insulating value by up to 50%. Left alone, it creates a pocket where mold grows inside the spacer bar. Homes with radiant floor heating or forced-air systems tend to be more susceptible.
Step three is simply staying on a schedule through the cold months. Subscription customers get their October pre-winter clean automatically as part of their seasonal rotation, with morning slots before temperatures drop below freezing. For homes in higher elevation communities — Heber City, Midway, Flagstaff — we recommend scheduling no later than October 15th. After that, nighttime temperatures narrow the window when outdoor cleaning is practical. Our team books out 2–3 weeks in advance as fall approaches, so planning ahead is the main thing.