What Size AC for a Sunny 25x20 ft Open Plan Room?
A sunny 25×20 ft open-plan room (500 sq ft) needs around 14,000 BTU/hr to compensate for extra heat gain.
How to use this tool
- Enter the room length and width in feet.
- Select the sun exposure level for your room.
- The calculator recommends the minimum BTU/hr rating for your AC unit.
Calculate the air conditioner BTU capacity needed for a large, sun-exposed open-plan living and dining area.
Frequently asked questions
- How many BTU do I need for a room?
- A general rule is 20 BTU per square foot for average rooms. Add 10% for sunny rooms and subtract 10% for heavily shaded rooms.
- What does BTU stand for?
- BTU stands for British Thermal Unit. It measures the amount of energy needed to raise one pound of water by one degree Fahrenheit. Air conditioners are rated in BTU/hr.