Schedule an Appointment

Send Message

What Size Ductless System Do I Need?

Ductless air conditioners, also called mini-splits, are practical alternatives to conventional systems in commercial and residential use. Compact and efficient, mini-splits are ideal for basements, room additions, data storage areas, conference rooms and retrofitting older buildings. The flexible zoning capability of ductless allows you to control the level of comfort you need in each space.

Computing Your Cooling Needs

The biggest factor in accurate ductless air conditioner sizing for all Mitsubishi Electric ductless air conditioning systems is calculating the size of the area you need to cool. To determine the square footage of one room, multiply the length of the room by the width; for the whole building, total the square footage of all of the rooms. Follow the same procedure for ductless heat pump sizing. In addition to square footage, other factors to consider include ceiling height, number of occupants and solar effect. The HVAC professionals listed on know how these factors work together to affect the cooling demand.

Understanding BTUs

The cooling capacity of heat pumps and air conditioners is measured in BTUs (British Thermal Units). In general, one BTU cools 25 square feet. Selecting a system that supplies enough BTUs to cool your space ensures your comfort and helps you take charge of energy expenses.

What Size Mini Split Do I Need?

Now that you understand the relationship between square footage and BTUs, the following chart will answer the question “what size mini split do I need?”

  • Up to 150 square feet, 5,000 BTUs
  • 151 to 250 square feet, 6,000 BTUs
  • 251 to 300 square feet, 7,000 BTUs
  • 301 to 350 square feet, 8,000 BTUs
  • 351 to 400 square feet, 9,000 BTUs
  • 401 to 450 square feet, 10,000 BTUs
  • 451 to 550 square feet, 12,000 BTUs
  • 551 to 700 square feet, 14,000 BTUs
  • 701 to 1,000 square feet, 18,000 BTUs
  • 1,001 to 1,200 square feet, 21,000 BTUs

The system you buy must supply at least the quantity of BTUs needed to cool your space. If your space totals 800 square feet, you need to buy a unit that delivers 18,000 BTUs in order to get the cooling capacity to meet your demand.

Ductless Split System Installation Experts

The best ductless air conditioning systems are ones that are properly sized and correctly installed. When you work with a Texas Ductless Mitsubishi Electric contractor, you are working with a skilled professional who specializes in ductless systems. Our contractors have extensive experience calculating load demands and installing ductless systems and will provide the expert guidance you need.