Portable Air Conditioner Size Calculator

Find the right BTU capacity for your portable air conditioner by entering your room details below.

Hold Ctrl/Cmd to select multiple options

Understanding Portable Air Conditioner Sizing

Choosing the right size portable air conditioner is crucial for efficient cooling and comfort. A properly sized unit will cool effectively while minimizing energy consumption and operating costs.

Key Sizing Factors

Room Dimensions

  • Square footage is the primary sizing factor
  • Ceiling height affects total room volume
  • Irregular room shapes may need adjustment
  • Multiple connected rooms require additional capacity

Environmental Factors

  • Sun exposure impacts cooling requirements
  • Insulation quality affects heat retention
  • Climate zone determines baseline needs
  • Window quality and quantity matter

Heat Sources

  • Number of room occupants
  • Electronic equipment heat output
  • Lighting fixtures
  • Nearby kitchen appliances

Usage Patterns

  • Time of day operation
  • Continuous vs. intermittent use
  • Peak cooling periods
  • Seasonal requirements

BTU Sizing Guidelines

Room Area (sq ft) Base BTU Required With Poor Insulation With High Sun Exposure
100-150 5,000 6,000 6,500
150-250 6,000 7,200 7,800
250-350 8,000 9,600 10,400
350-450 10,000 12,000 13,000
450-550 12,000 14,400 15,600
550-700 14,000 16,800 18,200
*Additional adjustments needed for heat-generating equipment and occupancy

Adjustment Factors

Sunlight Exposure

  • Low (North-facing): No adjustment
  • Moderate (East/West): Add 10%
  • High (South-facing): Add 20%

Insulation Quality

  • Good: No adjustment
  • Average: Add 10%
  • Poor: Add 20%

Occupancy

  • Each person: Add 600 BTU
  • High activity: Add 800 BTU per person

Equipment Heat

  • Computers: 1,000 BTU each
  • TV/Entertainment: 1,000 BTU
  • Kitchen appliances: 3,000 BTU

Portable AC Features to Consider

Ventilation Types

  • Single-hose vs. dual-hose systems
  • Impact on cooling efficiency
  • Installation requirements
  • Airflow considerations

Energy Efficiency

  • EER (Energy Efficiency Ratio)
  • Operating costs
  • Energy-saving modes
  • ENERGY STAR certification

Additional Functions

  • Dehumidification capability
  • Fan-only operation
  • Heating options
  • Smart features

Mobility Considerations

  • Unit weight and size
  • Wheel quality
  • Handle design
  • Storage requirements

Installation Tips

Optimal Placement

  • Keep unit away from walls and furniture
  • Position near window for shortest vent hose run
  • Ensure proper drainage access
  • Consider noise impact on room usage

Window Adaptation

  • Use provided window kit properly
  • Seal gaps effectively
  • Consider security implications
  • Account for window type and size

Frequently Asked Questions

What happens if I choose a portable AC that's too small?

An undersized unit will:

  • Run continuously without reaching desired temperature
  • Increase energy consumption and costs
  • Suffer from increased wear and tear
  • Provide inadequate comfort

Can I use a portable AC in multiple rooms?

While possible, consider:

  • Unit must be properly sized for largest room
  • Ventilation setup needed in each room
  • Moving unit between rooms requires reinstallation
  • May need multiple window kits

How do single-hose and dual-hose units differ?

Key differences include:

  • Single-hose units are simpler but less efficient
  • Dual-hose systems provide better cooling performance
  • Installation complexity varies
  • Cost and energy efficiency trade-offs

Should I size up or down if between BTU ratings?

Consider these factors:

  • Size up for sunny rooms or poor insulation
  • Size down for energy efficiency in ideal conditions
  • Account for future needs
  • Consider dehumidification requirements

Maintenance Requirements

Regular Tasks

  • Clean or replace air filters monthly
  • Empty water collection tank as needed
  • Clean exterior housing
  • Check and clean vents

Seasonal Care

  • Clean and dry thoroughly before storage
  • Check and clean condenser coils
  • Inspect window seals and kits
  • Test all operating modes

Energy Efficiency Tips

  • Use timer functions to optimize operation
  • Maintain proper ventilation
  • Clean filters regularly
  • Minimize heat sources in room
  • Use in conjunction with fans for better circulation
  • Keep direct sunlight out during peak hours