Factors Affecting Mini-Split Sizing

Choosing the right mini-split isn’t just about room size—other factors significantly impact how much heating or cooling power (BTUs) you need. Here’s what to consider:

🌡 Climate

• Live in a hot climate where summer temps regularly exceed 90°F? Increase your BTU capacity by 30%.
• In colder regions, heating demand rises, so opt for a unit with a strong heat pump feature.

🏠 Home Age & Insulation

• Older homes with poor insulation lose more air, requiring 30% more BTUs.
• Newer homes with better insulation hold temperature better, needing fewer BTUs.

📏 Ceiling Height

• If your ceilings are higher than 8 feet, increase the BTU capacity by 20% to account for extra air volume.

🪟 Windows & Doors

• More windows & doors = higher cooling/heating demand due to air leaks.
• Well-insulated windows reduce heat loss, lowering BTU needs.

☀️ Sunlight Exposure

• Rooms with direct sunlight warm up quickly—factor this in when sizing your unit.
• Use curtains or window tint to minimize heat gain.

🍳 Kitchen Placement

• Kitchens generate extra heat from appliances like ovens and stoves. If installing a unit nearby, choose a higher BTU rating.

👥 Number of Occupants

• People generate body heat—if the space is regularly used by 3+ people, add 600 BTUs per person.

💡 Lighting & Flooring

• Incandescent bulbs create extra heat—switching to LEDs can help reduce this.
• Carpeted floors hold warmth better than tile or hardwood, affecting heating needs.

Final Tip:

Before purchasing a mini-split, consider all these factors—not just square footage—to ensure optimal comfort and efficiency!