Clackamas County, Oregon

Home Building Efficiency Report

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US Climate Zone Map
4C – Mixed Marine

Clackamas County, Oregon is located within the Mixed Marine climate zone, which also has the designation of #4C. The US Department of Energy has split the United States into eight zones to help in creating optimal building practices to achieve the most energy savings within homes.

A cold climate is defined as a region with between 5,400 and 9,000 heating degree days (65°F basis).

A marine climate is defined as a region that meets all of the following criteria:

  • A coldest month mean temperature between 27°F (-3°C) and 65°F (18°C).
  • A warmest month mean of less than 72°F (22°C)
  • At least 4 months with mean temperatures higher than 50°F (10°C)
  • A dry season in summer. The month with the heaviest precipitation in the cold season has at least three times as much precipitation as the month with the least precipitation in the rest of the year. The cold season is October through March in the Northern Hemisphere and April through September in the Southern Hemisphere.
  • Best Energy Saving Products

    We've outlined a handful of building products that should be tailored for homes specifically in your Oregon county. We detail the recommendations, how to interpret them, and then some of the more popular brands that meet or exceed those energy-saving standards.

    Windows in Clackamas County are expected to have a U-Factor of 0.3 or less. The lower the U-Factor value of a window, the better it is at keeping heat inside the home.

    The expected Solar Heat Gain Coefficient (SHGC) of windows installed in Clackamas County should be equal to or less than 0.4. This value measures how well a product can resist unwanted solar heat gain, which is important in the warmer summer months.

    Climate Zone Window U-Factor Skylight U-Factor Glazed SHGC Air Leakage
    4C – Mixed Marine
    0.3 0.55 0.4 ≤5

    Any new or replacement window will be better at preserving energy than an old leaky one. Double paned windows with argon gas are the most energy efficient, but also the most expensive.

    Manufacturer Product Type Material Installation Price U-Factor* SHGC*
    350 Series Casement, Double Hung, Single Hung, Awning, Sliding Vinyl New 0.24-0.29 0.14-0.41
    Reserve Casement, Double Hung, Awning, Single Hung, Picture Wood/Aluminum Clad New 0.26-0.46 0.16-0.6
    250 Series Casement, Double Hung, Single Hung, Awning, Sliding, Picture Vinyl New 0.27- 0.28-
    Lifestyle Casement, Double Hung, Picture, Awning Wood Interior New 0.29- 0.27-
    W-2500 Casement, Awning, Double Hung, Fixed Wood, Clad-Wood New, Replacement 0.24-0.47 0.17-0.6

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    * Each product has various options that impact energy performance.