What size AC for Sparks, NV? 3 tons for 2,000 sq ft

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

3 tons central AC or heat pump, about 35,800 BTU/hr of load

The 20 BTU per square foot chart would put in 3.5 tons, about 17% 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 671 square feet in this climate. For a single room, size by the room: 17.9 BTU/hr per square foot.

The climate it is sized for

Climate from NOAA's 1991 to 2020 normals at Reno Airport (5.4 mi away). Jul is the hottest month, averaging a high of 93.9°F and a low of 60.4°F, with about 65 days a year at 90°F or more. That gives a design temperature of 100°F against 75°F inside.

What it costs to run

About 1,355 kWh a year at SEER2 14.3, or roughly $181 at Nevada's average residential rate of 13.36¢ per kWh. Cooling runs 4 months of the year here.

What drives the load in Sparks

Of the 35,800 BTU/hr, 18,000 comes through walls, roof and windows on a 100°F afternoon (50%), 13,000 is sun on the house (36%), 2,120 is four people and their appliances, and 2,700 is moisture the coil has to wring out of Sparks'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 33,120 BTU/hr before the moisture allowance.

Other house sizes in Sparks

Single rooms with a window or mini-split unit: a 150 sq ft bedroom needs about 2,700 BTU/hr; a 350 sq ft living room needs about 6,300 BTU/hr; a 600 sq ft open plan kitchen and family room needs about 10,700 BTU/hr.

Month by month in Sparks

Jul alone uses 36% of the year's cooling energy. The unit runs the equivalent of 542 hours a year at full output.

Sparks against nearby cities

Of 10 Nevada cities here, Sparks has the 8th highest cooling load. The range runs from Carson at 30,700 BTU/hr to Henderson at 55,200.

Where Sparks's weather numbers come from

The nearest NOAA station with full 1991 to 2020 normals is Reno Airport, 5.4 miles from the center of Sparks at 4,405 ft above sea level. That is close enough that the station's summers are Sparks's summers.

1 other city uses the same station and get the same climate inputs. The closest to Sparks: Reno (7 mi away, 5.2 mi from the station). Sparks is farther from the station than 1 of them.

The sun over Sparks in late July

At 39.57°N, the noon sun on 21 July stands 70.8° above the horizon over Sparks and the day runs 14 h 23 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.

111,520 people live in Sparks, the 5th largest of the 10 Nevada cities sized on this site. Coordinates used: 39.5743, -119.7152.

Sparks AC sizing questions