Manual J design temperatures for Anchorage, AK
Winter -6.0 °F, summer 70.9 °F / 58.6 °F wet bulb, daily range L: the outdoor design conditions for a residential load calculation in Anchorage, with a free lookup for any address.
Anchorage, AK: Manual J outdoor design conditions
| Winter design dry bulb (99 %) | -6.0 °F |
| Summer design dry bulb (1 %) | 70.9 °F |
| Coincident wet bulb (1 %) | 58.6 °F |
| Daily range class | L |
| Grains difference (75 °F, 50 % RH indoor) | -11 gr/lb |
| Elevation | 138 ft |
ASHRAE Handbook method (2025 edition) at Anchorage-Merrill Field Ap (WMO 702735), the nearest station with a recent record to the city centre. A different address in the area can use a different station: look it up below.
What these numbers mean for a house in Anchorage
Heating equipment and heat pumps in Anchorage are sized for an outdoor temperature of -6.0 °F: colder than that for only about 88 hours in a typical year. Cooling is sized for 70.9 °F with a coincident wet bulb of 58.6 °F. The daily range is low (under 15 °F), which sets the Manual J cooling-load factors, and a grains difference of -11 gr/lb drives the latent (moisture) load. With indoor design temperatures of 70 °F heating and 75 °F cooling, the design temperature differences are 76.0 °F and -4.1 °F.
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Frequently asked questions
What is the Manual J winter design temperature for Anchorage, AK?
-6.0 °F: the 99 % heating dry bulb by the ASHRAE method at Anchorage-Merrill Field Ap.
What is the Manual J summer design temperature for Anchorage, AK?
70.9 °F dry bulb (1 %) with a coincident wet bulb of 58.6 °F.
Which daily range class does Anchorage use?
Class L: low (under 15 °F).
Can I get the values for my exact address?
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