Replacing windows in Spokane
Spokane's winters are long, cold and snowy. NOAA's engineering weather data for Spokane lists a 50-year ground snow load of 42 pounds per square foot and an average of about 72 freeze-thaw cycles a year. A joint City of Spokane and Spokane County codes policy sets frost depth at 24 inches below finished grade, which says something about how deep the cold reaches. For windows, winter performance comes first here.
U-factor first
The U-factor on a window's label measures how much heat escapes through the window. In a cold climate, it's usually the most important number: lower means less heat loss and a warmer surface on the inside of the glass, which also helps comfort near the window. Double-pane windows with low-E coatings and gas fills are common. Triple-pane glass is an option for bedrooms, rooms with large windows or homes near noise; it's heavier and costs more. Ask the contractor to compare U-factors across the options.
Condensation and frost
When warm, humid indoor air meets cold glass, condensation forms, and on very cold nights it can freeze into frost on the inside of the glass. Over time, water running down onto sills can damage wood and drywall. Windows with warm-edge spacers, insulating frames and a good condensation resistance rating reduce it. Controlling indoor humidity, especially in kitchens and bathrooms, helps too.
Freeze-thaw, ice and the sill
Snow and ice build up on sills and in window wells. Water that gets behind trim or into the wall and freezes can open gaps and loosen sealants over the years. Good installation keeps water out with sloped sills, proper flashing and flexible sealants. Ask how the contractor flashes and seals each window, and how they handle sills on windows that collect snow.
Basement and egress windows
Basement bedrooms need windows that meet emergency escape requirements, and window wells need to be cleared of snow so the window can actually be used. If you're replacing or enlarging a basement window, ask the contractor to confirm the requirements with the local building department.
Winter installation
Windows can be replaced in winter, but each opening is exposed while the old window is out. Ask how the contractor will limit the time each opening is open and keep the house warm.
Ice dams and roof runoff
Snow sliding off roofs and dripping from icicles can land on sills and splash against lower windows. Gutters, heat cables and roof edges are outside the window contractor's scope, but mention any ice problems so they can plan flashing and sill details around them.
Summer sun
Spokane summers can be hot and dry. West-facing rooms may benefit from glass with a lower solar heat gain coefficient, even while the rest of the house prioritizes U-factor.
Checking a contractor in Washington
Washington's Department of Labor & Industries publishes a free contractor registration lookup. Check the business's registration, and the bond and insurance information L&I lists, before you sign.