What size AC for Hastings, NE? 3 tons for 2,000 sq ft

What size AC a 2,000 sq ft house in Hastings needs

3 tons central AC or heat pump, about 32,300 BTU/hr of load

The 20 BTU per square foot chart would put in 3.5 tons, about 30% more than this climate needs. An oversized unit cools the air fast, shuts off before it pulls moisture out, and leaves the house cold and clammy.

If a contractor quotes you more than 3 tons for an average 2,000 sq ft house here, ask to see the Manual J load calculation behind it before you sign. That works out to one ton per 743 square feet in this climate. For a single room, size by the room: 16.1 BTU/hr per square foot.

The climate it is sized for

Climate from NOAA's 1991 to 2020 normals at Hastings Municipal Airport (1.9 mi away). Jul is the hottest month, averaging a high of 88°F and a low of 66°F, with about 36 days a year at 90°F or more. That gives a design temperature of 93°F against 75°F inside.

What it costs to run

About 1,578 kWh a year at SEER2 14.3, or roughly $204 at Nebraska's average residential rate of 12.92¢ per kWh. Cooling runs 5 months of the year here.

What drives the load in Hastings

Of the 32,300 BTU/hr, 12,960 comes through walls, roof and windows on a 93°F afternoon (40%), 13,000 is sun on the house (40%), 2,120 is four people and their appliances, and 4,200 is moisture the coil has to wring out of Hastings's summer air (13%).

Sun is the biggest share here, more than heat through the walls, so shading west windows and a light roof cut the size you need more than extra insulation would. Sensible heat totals 28,080 BTU/hr before the moisture allowance.

Other house sizes in Hastings

Single rooms with a window or mini-split unit: a 150 sq ft bedroom needs about 2,400 BTU/hr; a 350 sq ft living room needs about 5,600 BTU/hr; a 600 sq ft open plan kitchen and family room needs about 9,700 BTU/hr.

Month by month in Hastings

Jul alone uses 33% of the year's cooling energy. The unit runs the equivalent of 699 hours a year at full output.

Hastings against nearby cities

Of 16 Nebraska cities here, Hastings has the 6th highest cooling load. The range runs from South Sioux City at 28,000 BTU/hr to Bellevue at 34,300.

Where Hastings's weather numbers come from

The nearest NOAA station with full 1991 to 2020 normals is Hastings Municipal Airport, 1.9 miles from the center of Hastings at 1,939 ft above sea level. That is close enough that the station's summers are Hastings's summers.

No other city in this set uses Hastings Municipal Airport, so this sizing is Hastings's alone.

The sun over Hastings in late July

At 40.60°N, the noon sun on 21 July stands 69.8° above the horizon over Hastings and the day runs 14 h 29 min from sunrise to sunset. A lower noon sun puts more of the day's heat on east and west walls than on the roof, which is why shading west glass pays off here. Shorter days give the house a longer night to shed the day's heat.

25,152 people live in Hastings, the 9th largest of the 16 Nebraska cities sized on this site. Coordinates used: 40.5963, -98.3903.

Hastings AC sizing questions