Information About Your Climate Zone

Hampshire County, Massachusetts is located in the Northern Climate Zone. When shopping for ENERGY STAR certified doors:

Northern and North-Central Climate Zone Door Criteria

DOORS**
Glazing Level	Climate Zone	U-Factor¹	SHGC²
Opaque	All Zones	≤ 0.17	No Rating
≤ ½-Lite	All Zones	≤ 0.23	≤ 0.23
> ½-Lite	Northern	≤ 0.26	≤ 0.40
> ½-Lite	North-Central	≤ 0.26	≤ 0.40

¹ Btu/h·ft2·°F
² Solar Heat Gain Coefficient

SLIDING GLASS DOORS - Most Efficient Criteria
Climate Zone	U-Factor	SHGC
Northern	≤ 0.20	≥ 0.20
North-Central	≤ 0.20	≤ 0.40

** All types of exterior doors must meet ENERGY STAR criteria (not Most Efficient) to be eligible for 25C Federal tax credits.

Look for these labels:

Doors that are certified to meet the ENERGY STAR requirements in your climate zone have labels that will include the following area shaded:
*Note that some products may meet the criteria in multiple climate zones and can therefore have multiple climate zones shaded*

door label for northern and north-central climate zone

You may also find products that are certified to meet the requirements in all 50 states, and have labels that look like this:

window, door and skylight label for all climate zones

ENERGY STAR certified products must have certified U-factor and Solar Heat Gain Coefficient (SHGC) ratings. These ratings must meet strict qualification criteria.

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