What Size Air Conditioner Do I Need for a Kitchen?
The kitchen is a 4,000 BTU/hr adder on top of whatever row the floor area already earned.
Full breakdown: BTU per square foot.
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Capacity from the chart
| Figure | Number | Source |
|---|---|---|
| Area row, 150 up to 250 sq ft | 6,000 BTU/hr | ENERGY STAR |
| Unit used in a kitchen | add 4,000 BTU/hr | ENERGY STAR |
| Worked total, no other adjustment | 6,000 + 4,000 = 10,000 BTU/hr | ENERGY STAR inputs |
The 4,000 BTU/hr kitchen adjustment is not a floor-area row. A kitchen that measures a different size uses that size's row, then adds 4,000. The 10,000 BTU/hr total above is only the 150 up to 250 example. A kitchen that instead falls in 250 up to 300 sq ft starts at 7,000 BTU/hr, and 7,000 + 4,000 = 11,000 BTU/hr. Row choice for a kitchen that lands on a boundary, such as 300 sq ft, is on that room's own page.
How to size it
ENERGY STAR lists the adjustments separately and does not publish a required order. Use this order so the kitchen adder is not confused with shade: measure the area, choose the row (shade pushes a boundary down, sun or extra people push it up), apply shade or sun to that row, add 600 BTU/hr for each person beyond two, and add 4,000 last because it comes from how the unit is used.
Plain example, which is the one to remember: 150 up to 250 sq ft is 6,000 BTU/hr, plus 4,000 = 10,000 BTU/hr.
Heavily shaded version of that same kitchen: 10% of 6,000 is 600, so 6,000 − 600 = 5,400 BTU/hr, then 5,400 + 4,000 = 9,400 BTU/hr. Very sunny version: 6,000 + 10% = 6,600, then 6,600 + 4,000 = 10,600 BTU/hr. Sunny and one person beyond two: 6,600 + 600 = 7,200, then 7,200 + 4,000 = 11,200 BTU/hr. Do not also flip the kitchen into a larger area row unless the measurement says so.
An L-shaped kitchen is a measuring job, not a bigger adder. Split the outline into rectangles and triangles. A triangle is length times width divided by 2. Inches left over a whole foot convert as 3 in = .25 ft, 6 in = .5 ft, and 9 in = .75 ft. The 4,000 does not change because the shape was awkward. Only the area result can change the row.
The area rows assume an 8-foot ceiling. A higher ceiling is a reason to select a room air conditioner with a higher CADR. It is not a second kitchen adder.
Skipping the area row and buying "something above 10,000, to be safe" is how kitchens get the oversized unit ENERGY STAR warns about: it costs more to purchase, wastes energy, and does not provide better cooling, and the room can feel damp and clammy because the unit stops before the humidity is gone.
A small kitchen that would rather not use a window unit can compare a ductless head in the mini-split room size guide. The 4,000 adder on this page is the room-AC rule, not a head-size table.
10,000 BTU window air conditioners on Amazon Window air conditioner support brackets on Amazon
Related questions
- What size air conditioner for a 150 sq ft room
- What size air conditioner for a 200 sq ft room
- What size air conditioner for a 250 sq ft room
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 does a kitchen need?
Find the floor-area row first, then add 4,000 BTU/hr because the unit is used in a kitchen. A kitchen of 150 up to 250 sq ft starts at 6,000 BTU/hr, and 6,000 + 4,000 = 10,000 BTU/hr.
Do shade and sun still apply in a kitchen?
Yes, and they are opposites. A heavily shaded kitchen reduces the area row by 10% before the kitchen adder: 6,000 − 10% = 5,400, then 5,400 + 4,000 = 9,400 BTU/hr. A very sunny kitchen adds 10% first: 6,000 + 10% = 6,600, then 6,600 + 4,000 = 10,600 BTU/hr.
How do I measure an L-shaped kitchen?
Multiply length by width for each rectangle. ENERGY STAR says a triangle is length × width ÷ 2, and a complex shape should be split into rectangles and triangles. Inch leftovers convert as 3 in = .25 ft, 6 in = .5 ft, and 9 in = .75 ft.
Does the 4,000 BTU/hr adder replace a load calculation?
No. It adjusts a room air conditioner on 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. Each person beyond two still adds 600 BTU/hr.