Multi-Split Air Conditioning System Planner

Plan your multi-split air conditioning system for multiple rooms. Calculate required BTU capacity, equipment costs, and energy consumption for optimal cooling efficiency.

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The total number of rooms that will be cooled by the multi-split system. This determines how many indoor units you'll need and affects the outdoor unit capacity requirements.
rooms
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The combined floor area of all rooms to be cooled. Larger areas require more cooling capacity measured in BTU to maintain comfortable temperatures.
square meters
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The typical height from floor to ceiling across your rooms. Higher ceilings increase the volume of air that needs cooling, requiring greater capacity.
meters
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Your local climate conditions affect cooling demands. Hotter climates require higher BTU capacity to achieve the same comfort level.
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How well your building retains cool air and blocks external heat. Better insulation reduces the cooling capacity needed and lowers operating costs.
?
The amount of direct sunlight your rooms receive throughout the day. High sun exposure increases heat gain and cooling requirements.
?
The typical number of people using the rooms simultaneously. More occupants generate additional body heat that must be offset by cooling.
?
The cost of the multi-split outdoor condenser unit. This is the main component that connects to multiple indoor units throughout your space.
$
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The cost per indoor air handler unit. You'll need one indoor unit for each room, so total cost is multiplied by the number of rooms.
$
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Professional installation charges including labor, refrigerant lines, electrical work, and mounting. Complex installations with longer pipe runs cost more.
$
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Your local cost per kilowatt-hour of electricity. This rate determines your ongoing operating expenses for running the air conditioning system.
USD per kWh
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Average number of hours per day the system will run. Longer usage times increase energy consumption and monthly operating costs.
hours
Results
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Required BTU Capacity
The total British Thermal Units per hour needed to adequately cool your entire space. This is the minimum capacity your outdoor unit should provide based on your specific conditions.
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Required Capacity
The cooling capacity expressed in kilowatts or tons. This helps you select the appropriate outdoor unit size from manufacturer specifications.
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Outdoor Units Needed
The number of outdoor condenser units required for your configuration. Most residential multi-split systems use one outdoor unit for 2-8 indoor units.
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Total Equipment Cost
The combined cost of all outdoor and indoor units needed for your system. This represents your upfront equipment investment before installation.
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Total Installation Cost
The complete cost including equipment and professional installation. This is your total initial investment to have the multi-split system fully operational.
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Estimated Power Consumption
The electrical power drawn by the system during operation, measured in kilowatts. This indicates the system's electrical demand on your home's power supply.
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Daily Energy Usage
The kilowatt-hours consumed per day based on your usage hours. This helps you understand your daily electricity consumption from air conditioning.
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Monthly Operating Cost
Your estimated monthly electricity cost to run the system at your specified usage pattern. Use this to budget for ongoing air conditioning expenses.
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Annual Operating Cost
Your estimated yearly electricity cost for the multi-split system. This helps evaluate long-term affordability and compare with alternative cooling solutions.
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Average BTU per Room
The cooling capacity allocated to each room on average. This helps verify that individual rooms receive adequate cooling power for comfort.
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Multi-Split Air Conditioning System Planner

This multi-split air conditioning system planner helps you design an efficient cooling solution for multiple rooms using a single outdoor unit. Enter your space specifications, climate conditions, and usage patterns to calculate the required BTU capacity, number of units needed, and total costs. The calculator provides both upfront equipment and installation costs, plus ongoing monthly and annual operating expenses, helping you make informed decisions about your HVAC investment and choose the right system configuration for your needs.

Input Parameters Explained

Parameter
Description
Number of Rooms
The total number of rooms that will be cooled by the multi-split system. This determines how many indoor units you'll need and affects the outdoor unit capacity requirements.
Total Area
The combined floor area of all rooms to be cooled. Larger areas require more cooling capacity measured in BTU to maintain comfortable temperatures.
Average Ceiling Height
The typical height from floor to ceiling across your rooms. Higher ceilings increase the volume of air that needs cooling, requiring greater capacity.
Climate Zone
Your local climate conditions affect cooling demands. Hotter climates require higher BTU capacity to achieve the same comfort level.
Insulation Quality
How well your building retains cool air and blocks external heat. Better insulation reduces the cooling capacity needed and lowers operating costs.
Sun Exposure
The amount of direct sunlight your rooms receive throughout the day. High sun exposure increases heat gain and cooling requirements.
Room Occupancy
The typical number of people using the rooms simultaneously. More occupants generate additional body heat that must be offset by cooling.
Outdoor Unit Price
The cost of the multi-split outdoor condenser unit. This is the main component that connects to multiple indoor units throughout your space.
Indoor Unit Price (Each)
The cost per indoor air handler unit. You'll need one indoor unit for each room, so total cost is multiplied by the number of rooms.
Installation Cost
Professional installation charges including labor, refrigerant lines, electrical work, and mounting. Complex installations with longer pipe runs cost more.
Electricity Rate
Your local cost per kilowatt-hour of electricity. This rate determines your ongoing operating expenses for running the air conditioning system.
Daily Usage Hours
Average number of hours per day the system will run. Longer usage times increase energy consumption and monthly operating costs.

Understanding Your Results

Result
What It Means
Required BTU Capacity
The total British Thermal Units per hour needed to adequately cool your entire space. This is the minimum capacity your outdoor unit should provide based on your specific conditions.
Required Capacity
The cooling capacity expressed in kilowatts or tons. This helps you select the appropriate outdoor unit size from manufacturer specifications.
Outdoor Units Needed
The number of outdoor condenser units required for your configuration. Most residential multi-split systems use one outdoor unit for 2-8 indoor units.
Total Equipment Cost
The combined cost of all outdoor and indoor units needed for your system. This represents your upfront equipment investment before installation.
Total Installation Cost
The complete cost including equipment and professional installation. This is your total initial investment to have the multi-split system fully operational.
Estimated Power Consumption
The electrical power drawn by the system during operation, measured in kilowatts. This indicates the system's electrical demand on your home's power supply.
Daily Energy Usage
The kilowatt-hours consumed per day based on your usage hours. This helps you understand your daily electricity consumption from air conditioning.
Monthly Operating Cost
Your estimated monthly electricity cost to run the system at your specified usage pattern. Use this to budget for ongoing air conditioning expenses.
Annual Operating Cost
Your estimated yearly electricity cost for the multi-split system. This helps evaluate long-term affordability and compare with alternative cooling solutions.
Average BTU per Room
The cooling capacity allocated to each room on average. This helps verify that individual rooms receive adequate cooling power for comfort.

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