What size AC for Van Wert, OH? 2.5 tons for 2,000 sq ft

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

2.5 tons central AC or heat pump, about 29,000 BTU/hr of load

The 20 BTU per square foot chart would put in 3.5 tons, about 45% 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 2.5 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 828 square feet in this climate. For a single room, size by the room: 14.5 BTU/hr per square foot.

The climate it is sized for

Climate from NOAA's 1991 to 2020 normals at Van Wert 1 S (1.1 mi away). Jul is the hottest month, averaging a high of 84.5°F and a low of 64.4°F, with about 18 days a year at 90°F or more. That gives a design temperature of 89°F against 75°F inside.

What it costs to run

About 1,302 kWh a year at SEER2 14.3, or roughly $245 at Ohio's average residential rate of 18.81¢ per kWh. Cooling runs 5 months of the year here.

What drives the load in Van Wert

Of the 29,000 BTU/hr, 10,080 comes through walls, roof and windows on a 89°F afternoon (35%), 13,000 is sun on the house (45%), 2,120 is four people and their appliances, and 3,800 is moisture the coil has to wring out of Van Wert'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 25,200 BTU/hr before the moisture allowance.

Other house sizes in Van Wert

Single rooms with a window or mini-split unit: a 150 sq ft bedroom needs about 2,200 BTU/hr; a 350 sq ft living room needs about 5,100 BTU/hr; a 600 sq ft open plan kitchen and family room needs about 8,700 BTU/hr.

Month by month in Van Wert

Jul alone uses 31% of the year's cooling energy. The unit runs the equivalent of 642 hours a year at full output.

Van Wert against nearby cities

Of 176 Ohio cities here, Van Wert has the 80th highest cooling load. The range runs from Conneaut at 24,100 BTU/hr to Hamilton at 31,500.

Where Van Wert's weather numbers come from

The nearest NOAA station with full 1991 to 2020 normals is Van Wert 1 S, 1.1 miles from the center of Van Wert at 790 ft above sea level. That is close enough that the station's summers are Van Wert's summers.

No other city in this set uses Van Wert 1 S, so this sizing is Van Wert's alone.

The sun over Van Wert in late July

At 40.86°N, the noon sun on 21 July stands 69.5° above the horizon over Van Wert and the day runs 14 h 30 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.

11,123 people live in Van Wert, the 161st largest of the 176 Ohio cities sized on this site. Coordinates used: 40.8648, -84.5885.

Van Wert AC sizing questions