What Size Air Conditioner Do I Need? A Room-By-Room Guide

Choosing the right size air conditioner for your home isn’t just about comfort—it’s essential for energy efficiency, cost savings, and air quality. An oversized unit will cycle on and off too frequently, while an undersized one will struggle to cool your space. Here's a room-by-room guide to help you choose the ideal AC unit capacity using a BTU calculator.

Understanding BTU and AC Sizing

British Thermal Units (BTUs) measure cooling capacity. The higher the BTU, the more space the unit can cool. Use a BTU calculator to determine how many BTUs are needed based on room size, ceiling height, sun exposure, and number of occupants.

Bedroom (100–300 sq ft):

For a small to medium-sized bedroom, look for an AC unit with 5,000 to 7,000 BTUs. A quiet, energy-efficient model is ideal for better sleep.

Kitchen (150–250 sq ft):

Kitchens generate extra heat, so bump up the BTU requirement. A 7,000–10,000 BTU unit is typically recommended.

Living Room (300–600 sq ft):

This common area often has multiple occupants and electronics. Depending on the layout, aim for 10,000–14,000 BTUs.

Open Floor Plans:

Wondering about the best AC size for an open floor plan? You’ll need to add up the square footage of connected areas and consider higher BTU capacities—often 18,000+ BTUs for large, open-concept homes.

Home Office (100–200 sq ft):

Since computers and monitors emit heat, opt for 6,000–8,000 BTUs. A model with good air circulation helps maintain comfort during work hours.

Choosing the right unit is only half the battle—professional ac installation service ensures your system runs at peak performance from day one.

Final Thought

Matching your room size with the correct BTU output is crucial for optimal comfort, cost, and longevity of your cooling system. Use a BTU calculator, factor in your home's layout, and invest in energy efficiency for long-term savings.