Yukon-Koyukuk County, Alaska

Home Building Efficiency Report

8 – Subarctic/Arctic

Yukon-Koyukuk County, Alaska is located within the Subarctic/Arctic climate zone, which also has the designation of #8. 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 subarctic climate is defined as a region with 12,600 heating degree days (65° basis) or more. The only subarctic regions in the United States are in found Alaska.

Best Energy Saving Products

We've outlined a handful of building products that should be tailored for homes specifically in your Alaska 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 Yukon-Koyukuk 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 Yukon-Koyukuk 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
8 – Subarctic/Arctic	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.

Product	Type	Material	Installation	U-Factor*	SHGC*
E-Series	Casement, Double Hung, Awning, Bay, Gliding, Picture	Wood Interior, Aluminum Exterior	New, Replacement	0.27-0.26	0.16-0.41
Lifestyle	Casement, Double Hung, Picture, Awning	Wood Interior	New	0.29-	0.27-
Renewal	Casement, Double Hung, Awning, Bay, Gliding, Picture	Vinyl	Replacement	0.25-0.32	0.14-0.45
W-2500	Casement, Awning, Double Hung, Fixed	Wood, Clad-Wood	New, Replacement	0.24-0.47	0.17-0.6
Signature	Casement, Double Hung, Bay, Awning, Picture	Wood/Aluminum Clad	New	0.22-0.33	0.17-0.53

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* Each product has various options that impact energy performance.

Exterior doors follow basically the same energy saving equirements as windows. In Yukon-Koyukuk County, doors are expected to have a U-Factor of 0.3 or less. The lower the U-Factor value of a door (or more specifically, it's windows), the better it is at keeping heat inside the home.

The expected Solar Heat Gain Coefficient (SHGC) of doors installed in Yukon-Koyukuk County should be equal to or less than 1. This value measures how well a door's windows can resist unwanted heat gain, which is most important in the warmer summer months.

Climate Zone	Window U-Factor	Skylight U-Factor	Glazed SHGC	Air Leakage
8 – Subarctic/Arctic	0.3	0.55	1	≤5

Choosing the right exterior door for your specific location will help you conserve as much energy as possible.

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The recommended R-values for attics in Yukon-Koyukuk County should fall between R49 to R60. Exterior walls are dependant on the size studs being used, but it is generally accepted that they should have a minimum of R15 to R19. The recommended flooring R-values of 25-30 really only pertain to floors at or above ground level.

Climate Zone	Attics	2x4 Walls	2x6 Walls	Flooring	Crawlspaces
8 – Subarctic/Arctic	R49 to R60	R13 to R15	R19 to R21	R25 to R30	R25 to R30

R-values for walls represent the sum of cavity insulation plus any sheathing if it exists. A combination of any insulation methods can be used to achieve the desired R-value. The minimum values set should be considered the bare-minimum, and customers should strive to reach maximum R-values for maximum energy savings.

Product	Type	Material	R-Values*
Thermasheath	Board	Foam	3.2-31
AttiCat	Loose Fill	Fiberglass	19-60
Eco Kraft	Roll, Batt	Fiberglass	5-30
ThermaFiber	Batt	Rockwool	15-24
INS541LD	Loose Fill	Cellulose	13-60

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* Each product has various options that impact energy performance.