AC Sizing Tool

Find the right AC size for your room.

Enter your room size and a few real-world conditions. This tool gives a quick cooling capacity estimate and recommends a practical air conditioner type for your space.

BTU/h Estimate kW & Tons Conversion Mini Split / Multi-Split

Room & installation details

Room / area size (m²)

Ceiling height (m)

People usually in the room

Room type

Local summer climate

Product market / region

Cooling & heating need

Insulation quality

Sun exposure

Window area

Extra indoor heat load

Cooling area

One room or one open areaBedroom, living room, home office, or open-plan living area. Multiple separate rooms or zonesSeveral rooms need separate indoor units while sharing one outdoor unit.

Comfort details

Doors often stay openFor rooms connected to a hallway, balcony, or outdoor area. Quiet operation is importantUseful for bedrooms, nurseries, and home offices.

Result updated. Scroll down on mobile to view the recommendation.

Recommended residential product type

Mini Split AC

Best for a single room where direct, efficient comfort is needed without a full duct system.

Suggested ZERO product links

Recommended AC size: 12,000 BTU/h

Product suggestions use verified ZERO residential Mini Split and Multi-Split catalog data internally. Click a product card to view the corresponding product page. Final selection still needs dealer confirmation.

Estimated cooling demand10,860 BTU/h

Recommended AC size12,000 BTU/h

Approx. kW3.5 kW

Approx. tons1.0 ton

Approx. HP reference≈ 1.3 HP

Room area20.0 m²

Small roomLarge roomDealer check

For better comfort, avoid choosing a unit that is too small. If your space has strong sun, poor insulation, high ceilings, or frequent door opening, consider the next size up or consult an HVAC professional.

How this estimate works

This tool starts from a room-area BTU estimate for an 8 ft / 2.4 m ceiling, then adjusts for ceiling height, climate, insulation, sun exposure, window area, occupancy, room use, and extra indoor heat. Estimated cooling demand is the adjusted load estimate. Recommended AC size is rounded up to the next residential Mini Split / Multi-Split size class in this tool. Product cards are only shown as SKU matches when the parsed model cooling capacity can cover the estimated demand. This is for quick pre-selection only, not a professional Manual J load calculation or final model selection.

Need a product match?

Share this result with your local ZERO dealer to confirm the Mini Split or Multi-Split model, voltage, refrigerant, line set, installation clearance, and final load calculation.

Contact ZERO