What Size Air Conditioner Do I Need for 2,000 Sq Ft?
2,000 sq ft is the top boundary on the room-AC chart: 30,000 BTU/hr below it and 34,000 above it.
Full breakdown: BTU per square foot.
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Capacity from the chart
| Area to be cooled | Capacity needed | Source |
|---|---|---|
| 1,500 up to 2,000 sq ft | 30,000 BTU/hr | ENERGY STAR |
| 2,000 up to 2,500 sq ft | 34,000 BTU/hr | ENERGY STAR |
This is the last boundary the chart publishes. There is no row above 2,000 up to 2,500 sq ft and no capacity above 34,000 BTU/hr in the table. A 2,000 sq ft area cooled as one room-AC zone can use the two rows. A 2,000 sq ft house on a central system cannot. The product type in the source is a room air conditioner. Treating 34,000 as a central-system answer invents a use the chart does not state.
How to size it
If you are still on the room-AC question, the row gap is 4,000 BTU/hr. That matches the kitchen adder's size, so keep the reasons separate. Shade selects 30,000 and then takes 10% off. Sun or extra regular occupants select 34,000 and then apply their own adjustment. A kitchen adder is a third fact, not a synonym for "buy the higher row."
| Adjustment | On the 30,000 row | On the 34,000 row | Source |
|---|---|---|---|
| Heavily shaded, reduce capacity 10% | 30,000 − 10% = 27,000 BTU/hr | 34,000 − 10% = 30,600 BTU/hr | ENERGY STAR |
| Very sunny, increase capacity 10% | 30,000 + 10% = 33,000 BTU/hr | 34,000 + 10% = 37,400 BTU/hr | ENERGY STAR |
| Each additional person beyond two | 30,000 + 600 BTU/hr = 30,600 BTU/hr | 34,000 + 600 BTU/hr = 34,600 BTU/hr | ENERGY STAR |
| Unit used in a kitchen | 30,000 + 4,000 BTU/hr = 34,000 BTU/hr | 34,000 + 4,000 BTU/hr = 38,000 BTU/hr | ENERGY STAR |
10% of 30,000 BTU/hr is 3,000 BTU/hr (30,000 × 10%).
10% of 34,000 BTU/hr is 3,400 BTU/hr (34,000 × 10%).
Shaded lower path: 30,000 − 10% = 27,000 BTU/hr (10% of 30,000 is 3,000). Sunny upper path: 34,000 + 10% = 37,400 BTU/hr (10% of 34,000 is 3,400). One person beyond two on the upper row: 34,000 + 600 = 34,600 BTU/hr. Kitchen on the lower row: 30,000 + 4,000 = 34,000 BTU/hr, which equals the higher row's printed capacity only as a sum. Kitchen on the upper row: 34,000 + 4,000 = 38,000 BTU/hr. Use the upper-row kitchen sum only when the area both earned 34,000 and the unit is used in a kitchen.
"An oversized air conditioner costs more to purchase, wastes energy and does not provide better cooling." At this boundary the costly version is buying 34,000 for a shaded area whose chart path is 30,000 minus 10%.
The ceiling assumption does not get looser because the area is large. It is still an 8-foot ceiling, and a higher ceiling still means you may want a room air conditioner with a higher CADR.
34,000 BTU window air conditioners on Amazon Window air conditioner support brackets on Amazon
Related questions
- What size air conditioner for 1,500 sq ft
- What size air conditioner for 1,200 sq ft
- What size dehumidifier for 2,000 sq ft
All of these questions are listed on the topic map.
Sources
- ENERGY STAR, Room Air Conditioners — https://www.energystar.gov/products/room_air_conditioners — accessed Oct 2, 2026.
Frequently asked questions
What size air conditioner for 2,000 sq ft?
1,500 up to 2,000 sq ft is 30,000 BTU/hr, and 2,000 up to 2,500 sq ft is 34,000 BTU/hr. Heavy shade is the case for 30,000. A very sunny area, or more than two people regularly, is the case for 34,000.
Is 34,000 BTU/hr the largest figure on the chart?
34,000 BTU/hr is the capacity printed for 2,000 up to 2,500 sq ft, which is the highest row in the table. The boundary step into that row is 4,000 BTU/hr (34,000 − 30,000).
What do the four adjustments do at this size?
Shade on 30,000 subtracts 10% (3,000) and lands at 27,000 BTU/hr. Sun on 34,000 adds 10% (3,400) and lands at 37,400 BTU/hr. Each person beyond two adds 600 BTU/hr. A kitchen adds 4,000 BTU/hr.
Should a 2,000 sq ft house use this chart for central air?
No. The table sizes a room air conditioner and assumes an 8-foot ceiling. A whole-house central system should get a load calculation on the HVAC load calculator. Higher ceilings: select a room air conditioner with a higher CADR.