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AIR CONDITIONER BTU CALCULATOR

Window AC BTU Calculator for New Yorkers

Choosing the right BTU size is just as important as choosing the brand. Use this quick guide to estimate how many BTUs you need for your New York City apartment.

Step 1: Start with room size

A common rule of thumb is:

20 BTU per square foot of room space.

Approximate sizing:

Up to 150 sq ft → 3,000 BTU
150–250 sq ft → 5,000–6,000 BTU
250–350 sq ft → 6,000–8,000 BTU

350–450 sq ft → 8,000–10,000 BTU
450–550 sq ft → 10,000–12,000 BTU
550–700 sq ft → 12,000–14,000 BTU
700–1,000 sq ft → 14,000–18,000 BTU

Step 2: Adjust for top floors and strong sun

New York City apartments heat up faster if they are:

On the top floor of the building
Getting strong direct sunlight for most of the day (south‑ or west‑facing, big windows, no shade)

If your room is on the top floor or gets a lot of sun, we recommend adding 2,000 BTU to the estimate above.

Examples:

250 sq ft bedroom → base 6,000 BTU
- Top floor or very sunny → aim for around 8,000 BTU

400 sq ft living room → base 8,000–10,000 BTU
- Top floor or very sunny → aim for 10,000–12,000 BTU

Step 3: Still not sure? Ask NYC PIGEON

Room size, ceilings, layout, and sun exposure all matter, especially in older New York buildings. If you’re not sure which BTU is right, text us a photo of your window and your room size and we’ll recommend a size and model for you.

Call or text NYC PIGEON AIR CONDITIONER at 347‑719‑1499 or use the form on nycpigeonairconditioner.com to get BTU advice and schedule professional window AC installation anywhere in New York City.

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How Many BTUs Do You Need? (By Bedroom and Room Type)

New Yorkers usually don’t think in square feet first—they think in “small bedroom,” “big bedroom,” “living room.” Use this guide to match room type to BTU size, then adjust if you’re on the top floor or get heavy sun.

Small Bedroom (up to ~150 sq ft)

Typical NYC examples: interior bedroom, small office, compact kid’s room.

Recommended: 5,000–6,000 BTU
Good for: rooms about 10' x 10' to 10' x 15'popularmechanics+1

If this room is on the top floor or gets strong direct sun most of the day, bump up by 2,000 BTU (aim closer to 6,000–8,000).

Standard Bedroom (150–250 sq ft)

Typical NYC examples: most main bedrooms in prewar and postwar apartments.

Recommended: 6,000–8,000 BTU
Good for: rooms about 12' x 12' up to 12' x 18'cnn+1

Top floor or very sunny? Add 2,000 BTU (target the upper end, 8,000–10,000).

Large Bedroom or Small Studio (250–350 sq ft)

Typical NYC examples: big bedroom, small studio, or open bedroom + office nook.

Recommended: 8,000–10,000 BTU
Good for: ~15' x 15' to 15' x 20' spacespopularmechanics+1

Top floor / heavy sun: add 2,000 BTU (aim for 10,000–12,000).

Living Room or Large Studio (350–450 sq ft)

Typical NYC examples: main living room, average full studio, combined living/dining.

Recommended: 10,000–12,000 BTU
Good for: ~18' x 18' to 20' x 20' spacesconsumerreports+1

Top floor / strong sun: add 2,000 BTU (look at 12,000–14,000).

Big Living Room or One-Bedroom Layout (450–700 sq ft)

Typical NYC examples: big open living room, L‑shaped studio, or combined living + kitchen where one unit has to carry most of the load.

Recommended: 12,000–14,000 BTU
Good for: open spaces up to ~25' x 25' depending on layoutconsumerreports+1

Top floor / strong sun: add 2,000 BTU (14,000+ or consider a second unit).

Quick Rule and “+2,000 BTU” Adjustment

If you prefer a simple formula:

Start with about 20 BTU per square foot of room area.[cnn]
If your room is on the top floor or gets a lot of direct sunlight, add 2,000 BTU to whatever number you get.

Example:

200 sq ft bedroom → 4,000 BTU by formula → round up to 6,000–8,000 BTU, and if it’s top floor/sunny, aim closer to 8,000–10,000 BTU.