Petroleum County, Montana

Home Building Efficiency Report

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US Climate Zone Map
6B – Cold Dry

Petroleum County, Montana is located within the Cold Dry climate zone, which also has the designation of #6B. 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).

Best Energy Saving Products

We've outlined a handful of building products that should be tailored for homes specifically in your Montana 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 Petroleum 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 Petroleum County should be equal to or less than 1. 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
6B – Cold Dry
0.3 0.55 1 ≤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*
W-2500 Casement, Awning, Double Hung, Fixed Wood, Clad-Wood New, Replacement 0.24-0.47 0.17-0.6
Renewal Casement, Double Hung, Awning, Bay, Gliding, Picture Vinyl Replacement 0.25-0.32 0.14-0.45
Essential Casement, Double Hung, Awning, Picture, Glider Fiberglass New 0.25-0.44 0.18-0.54
100 Series Casement, Double Hung, Awning, Gliding, Picture, Single Hung Composite New, Replacement 0.23-0.32 0.16-0.42
Lifestyle Casement, Double Hung, Picture, Awning Wood Interior New 0.29- 0.27-

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* Each product has various options that impact energy performance.