What size AC for Liberal, KS? 3.5 tons for 2,000 sq ft

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

3.5 tons central AC or heat pump, about 38,100 BTU/hr of load

Here the 20 BTU per square foot chart lands close: 3.5 tons against a load of 3.2 tons. This is one of the climates the chart was written for.

If a contractor quotes you more than 3.5 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 630 square feet in this climate. For a single room, size by the room: 19 BTU/hr per square foot.

The climate it is sized for

Climate from NOAA's 1991 to 2020 normals at Liberal (1.6 mi away). Jul is the hottest month, averaging a high of 93.2°F and a low of 65.1°F, with about 81 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 2,006 kWh a year at SEER2 14.3, or roughly $306 at Kansas's average residential rate of 15.26¢ per kWh. Cooling runs 5 months of the year here.

What drives the load in Liberal

Of the 38,100 BTU/hr, 18,000 comes through walls, roof and windows on a 100°F afternoon (47%), 13,000 is sun on the house (34%), 2,120 is four people and their appliances, and 5,000 is moisture the coil has to wring out of Liberal's summer air (13%).

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 Liberal

Single rooms with a window or mini-split unit: a 150 sq ft bedroom needs about 2,900 BTU/hr; a 350 sq ft living room needs about 6,700 BTU/hr; a 600 sq ft open plan kitchen and family room needs about 11,400 BTU/hr.

Month by month in Liberal

Jul alone uses 30% of the year's cooling energy. The unit runs the equivalent of 753 hours a year at full output.

Liberal against nearby cities

Of 38 Kansas cities here, Liberal has the 14th highest cooling load. The range runs from Pittsburg at 33,100 BTU/hr to Wichita at 39,500.

Where Liberal's weather numbers come from

The nearest NOAA station with full 1991 to 2020 normals is Liberal, 1.6 miles from the center of Liberal at 2,834 ft above sea level. That is close enough that the station's summers are Liberal's summers.

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

The sun over Liberal in late July

At 37.05°N, the noon sun on 21 July stands 73.4° above the horizon over Liberal and the day runs 14 h 10 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.

19,184 people live in Liberal, the 23rd largest of the 38 Kansas cities sized on this site. Coordinates used: 37.0461, -100.9277.

Liberal AC sizing questions