Windows and doors: wood, fiberglass, composite, and vinyl.

Start here, not with the glass package.

The frame decides how the window ages, what sizes and shapes you can get, what it costs to maintain, and how it behaves going from thirty below to ninety five above every year. Glass packages are close to interchangeable across the majors. Frames are not.

• Wood

  Interior finish and the widest options

  Real wood inside, usually clad in aluminum, fiberglass, or vinyl outside. Best looking interior, the most size and shape freedom, and the highest price. The exposed side asks for maintenance and the clad side removes most of that.

• Fiberglass

  The stable one in a swing climate

  Expands and contracts at close to the same rate as glass, so seals stay under less stress through a Minnesota year. Strong, thin frames mean more glass in the same opening. Costs more than vinyl and less than clad wood.

• Vinyl

  The value answer, with honest limits

  Good numbers for the money and no painting, ever. The tradeoffs are size limits on big openings, fewer color options, and more movement with temperature. A heavy welded vinyl frame from a real manufacturer is a legitimate window. A thin one is a decade of service calls.

• Composite

  Between vinyl and wood

  Wood fiber and polymer blends that hold paint, resist rot, and go into larger openings than vinyl. Priced accordingly.

Brands we install and will compare honestly on your house: Andersen, built in Bayport since 1903, Pella, and Ply Gem, which is the value line that shows up on a lot of Twin Cities projects and deserves to be in the conversation. Published limited warranties run roughly twenty years on glass and ten on non glass components, with the details varying by line, and we will hand you the actual document rather than a summary of it.

A bit about condensation.

Every winter somebody calls us about water on the inside of their windows and asks whether the windows failed. Almost always the answer is no.

Condensation forms when moist indoor air touches a surface cold enough to bring it below the dew point. The glass is simply the coldest surface in the room, so it shows first. That makes it a humidity and temperature story, not a window defect. Building science consensus on this is settled and the University of Minnesota Extension lays it out well for our climate.

Where does the moisture come from? Showers, cooking, laundry, houseplants, unvented combustion, a wet basement or crawlspace, and people breathing. New windows and air sealing make a house tighter, which is a good thing that also means the moisture you generate no longer leaks out on its own. Tighter house, same moisture, colder glass, and now you can see it.

What actually helps: run the bath and kitchen fans and let them run longer than you think, keep indoor relative humidity down in deep cold, get air moving so it is not dead still against the glass, and fix the wet basement or crawlspace if that is the source. On the window itself, a warm edge spacer, low emissivity coatings, and gas fill all raise the interior glass surface temperature, which buys you margin.

Three cases worth telling apart. Water on the room side of the glass is a humidity issue. Fog between the panes is a failed seal and that is a window problem. Dew on the outside of the glass on a cool morning means the glass is doing its job and keeping your heat inside.