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

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

3 tons central AC or heat pump, about 31,900 BTU/hr of load

The 20 BTU per square foot chart would put in 3.5 tons, about 32% 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 753 square feet in this climate. For a single room, size by the room: 15.9 BTU/hr per square foot.

The climate it is sized for

Climate from NOAA's 1991 to 2020 normals at N Platte Regional Airport (4.2 mi away). Jul is the hottest month, averaging a high of 89.7°F and a low of 61.4°F, with about 39 days a year at 90°F or more. That gives a design temperature of 95°F against 75°F inside.

What it costs to run

About 1,179 kWh a year at SEER2 14.3, or roughly $152 at Nebraska's average residential rate of 12.92¢ per kWh. Cooling runs 4 months of the year here.

What drives the load in North Platte

Of the 31,900 BTU/hr, 14,400 comes through walls, roof and windows on a 95°F afternoon (45%), 13,000 is sun on the house (41%), 2,120 is four people and their appliances, and 2,400 is moisture the coil has to wring out of North Platte's summer air (8%).

Heat through the shell is the biggest share here, so insulation and air sealing cut the size you need more than shading would. Sensible heat totals 29,520 BTU/hr before the moisture allowance.

Other house sizes in North Platte

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 9,500 BTU/hr.

Month by month in North Platte

Jul alone uses 37% of the year's cooling energy. The unit runs the equivalent of 529 hours a year at full output.

North Platte against nearby cities

Of 16 Nebraska cities here, North Platte has the 7th highest cooling load. The range runs from South Sioux City at 28,000 BTU/hr to Bellevue at 34,300.

Where North Platte's weather numbers come from

The nearest NOAA station with full 1991 to 2020 normals is N Platte Regional Airport, 4.2 miles from the center of North Platte at 2,762 ft above sea level. That is close enough that the station's summers are North Platte's summers.

No other city in this set uses N Platte Regional Airport, so this sizing is North Platte's alone.

The sun over North Platte in late July

At 41.13°N, the noon sun on 21 July stands 69.3° above the horizon over North Platte and the day runs 14 h 32 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. Long days mean the house keeps gaining heat into the evening, well after the outdoor peak.

22,549 people live in North Platte, the 11th largest of the 16 Nebraska cities sized on this site. Coordinates used: 41.1250, -100.7504.

North Platte AC sizing questions