What size AC for Shreveport, LA? 4 tons for 2,000 sq ft

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

4 tons central AC or heat pump, about 44,900 BTU/hr of load

Here the 20 BTU per square foot chart lands close: 3.5 tons against a load of 3.7 tons. This is one of the climates the chart was written for.

If a contractor quotes you more than 4 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 534 square feet in this climate. For a single room, size by the room: 22.5 BTU/hr per square foot.

The climate it is sized for

Climate from NOAA's 1991 to 2020 normals at Shreveport (3.1 mi away). Aug is the hottest month, averaging a high of 94.9°F and a low of 73°F, with about 99 days a year at 90°F or more. That gives a design temperature of 102°F against 75°F inside.

What it costs to run

About 4,204 kWh a year at SEER2 14.3, or roughly $558 at Louisiana's average residential rate of 13.27¢ per kWh. Cooling runs 7 months of the year here.

What drives the load in Shreveport

Of the 44,900 BTU/hr, 19,440 comes through walls, roof and windows on a 102°F afternoon (43%), 13,000 is sun on the house (29%), 2,120 is four people and their appliances, and 10,400 is moisture the coil has to wring out of Shreveport's summer air (23%).

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 34,560 BTU/hr before the moisture allowance.

Other house sizes in Shreveport

Single rooms with a window or mini-split unit: a 150 sq ft bedroom needs about 3,400 BTU/hr; a 350 sq ft living room needs about 7,900 BTU/hr; a 600 sq ft open plan kitchen and family room needs about 13,500 BTU/hr.

Month by month in Shreveport

Aug alone uses 22% of the year's cooling energy. The unit runs the equivalent of 1,338 hours a year at full output.

Shreveport against nearby cities

Of 35 Louisiana cities here, Shreveport has the 2nd highest cooling load. The range runs from Covington at 37,800 BTU/hr to Natchitoches at 45,900.

Where Shreveport's weather numbers come from

The nearest NOAA station with full 1991 to 2020 normals is Shreveport, 3.1 miles from the center of Shreveport at 387 ft above sea level. That is close enough that the station's summers are Shreveport's summers.

No other city in this set uses Shreveport, so this sizing is Shreveport's alone.

The sun over Shreveport in late July

At 32.47°N, the noon sun on 21 July stands 77.9° above the horizon over Shreveport and the day runs 13 h 49 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.

176,578 people live in Shreveport, the 3rd largest of the 35 Louisiana cities sized on this site. Coordinates used: 32.4669, -93.7922.

Shreveport AC sizing questions