What size AC does each room need?
NYC's law says window and wall units must deliver at least 20 BTU per hour for every square foot of a covered bedroom. Add each room and we'll print the size to buy.
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Before you buy
The minimum is a floor. Most window units start at 5,000 BTU, so small bedrooms usually need the smallest size sold.
- Sunny rooms and kitchensENERGY STAR advises 10% more capacity for a sunny room and 4,000 BTU more for a kitchen.
- Electrical workLarger units can need a 230 volt outlet. Any electrical work needs a NYC licensed master electrician and a permit.
- InstallationWindow units must be installed to city rules, including brackets where required.
- Rent regulated apartmentsThe tenant must consent to the work and any associated charges.
Source: Local Law 23 of 2026, Admin. Code § 27-2030 and ENERGY STAR room AC sizing. General information, not legal or engineering advice.
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