Determining the Unit Size Needed for Your SpaceUpdated 6 hours ago

• Zone details: Number of rooms, plus the size and ceiling height of each.
• Environmental factors: Number of windows and the insulation quality.
• Heat loads: Number of heat-generating appliances and expected occupants.

Use our HVAC calculator to help determine the right unit size for your space.

To determine the system size you need, first figure out the square footage of your room. The recommendations below apply to standard 8-foot ceilings. For taller ceilings, choose a larger system size.

• 20 BTU per square foot for cooling-only applications.
• 25 BTU per square foot for heating and cooling.
• 30 BTU per square foot if you expect to use the unit as a main heat source in cold-climate areas, such as the northern United States and Canada.

Examples

• The most basic setup is a single-zone application, such as a single bedroom. For rooms measuring between 100 and 350 square feet, select a 9,000 BTU system.
• If you want to condition multiple zones but cannot use ductwork, consider a multi-zone system. These systems allow you to connect up to five indoor air handlers to a single outdoor unit, maximizing your space.
• For homes or offices with existing ductwork, consider selecting ducted mini-splits or standard central split systems.