10,000 BTU is the size shoppers reach for when a room is too big for a bedroom unit. In an average room it cools up to about 500 sq ft, with a best fit of 400 to 500 sq ft. That covers a typical living room, the main room of a studio apartment, or a large master bedroom with a sitting area.
A shaded, well insulated room stretches to about 610 sq ft; a sunny, poorly insulated one tops out around 390; a 10 ft ceiling brings it to 400. If the room opens onto a kitchen, the cooking load adds 4,000 BTU and the same unit only covers about 300 sq ft.
It is also the smallest size where a portable makes sense for a living room, as long as the SACC rating is at or near 10,000. Many portables sold as 14,000 BTU (ASHRAE) deliver roughly 9,000 to 10,000 BTU SACC, so read the smaller number on the box.
As heat, 10,000 BTU covers about 250 sq ft in a moderate climate, 330 in a hot one and 180 in a cold one. Electric heat at this output takes 2,930 W, more than one 120 V circuit can supply, so heaters in this class are 240 V units. A 10,000 BTU window AC draws about 910 W, 7.9 A at 115 V. Converted, it is 2.93 kW or 0.83 tons.
How many square feet a 10,000 BTU air conditioner cools
Largest room the unit keeps up with, rounded down to the nearest 10 sq ft. Two occupants, 8 ft ceiling and moderate climate unless the row says otherwise.
| Room | Cools up to |
|---|---|
| Shaded, good insulation | 610 sq ft |
| Average room (baseline) | 500 sq ft |
| Very sunny, poor insulation | 390 sq ft |
| Hot climate, very sunny | 410 sq ft |
| 10 ft ceiling | 400 sq ft |
| 4 people instead of 2 | 440 sq ft |
| Kitchen in the space | 300 sq ft |
How many square feet 10,000 BTU of heat covers
By climate and insulation. For a gas heater, use its output rating (input × efficiency).
| Climate | Poor insulation | Average insulation | Good insulation |
|---|---|---|---|
| hot | 270 sq ft | 330 sq ft | 390 sq ft |
| moderate | 200 sq ft | 250 sq ft | 290 sq ft |
| cold | 150 sq ft | 180 sq ft | 210 sq ft |
10,000 BTU in kW, watts and tons
| Kilowatts | 2.93 kW |
| Watts | 2,931 W |
| Tons of cooling | 0.83 tons |
| Power an AC this size draws (EER 11) | about 909 W, 7.9 A at 115 V |
| Power an electric heater needs for this output | 2,931 W, 12.2 A at 240 V |
kW and watts here are heat output, the number on the box. An air conditioner moves that much heat while drawing far less electricity; an electric heater draws exactly as much as it puts out.
10,000 BTU questions
How many square feet does a 10,000 BTU air conditioner cool?
About 500 sq ft in an average room, with a best fit of 400 to 500. Shaded and well insulated, up to about 610 sq ft; sunny and poorly insulated, about 390.
Is 10,000 BTU enough for a 20 × 20 room?
In an average room, yes: 400 sq ft needs about 8,000 BTU/hr. If it is very sunny and poorly insulated the load reaches about 10,100 BTU/hr, right at the limit, so a 12,000 BTU unit is the safer pick for that room.
How many amps does a 10,000 BTU AC draw?
About 8 A at 115 V, roughly 910 W for a unit with an EER of 11. Give it an outlet that is not shared with a microwave or space heater.