Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Construction
HVAC BTU Room Sizing Calculator
Size an air conditioner or mini-split to a room. Enter the room length and width, the ceiling height, choose the room's sun exposure, and add the number of regular occupants to estimate the cooling capacity in BTU per hour you need.
Fill in the required fields to see your result.
Construction
HVAC BTU Calculator
Estimates the BTU per hour needed to heat or cool a room based on its size, ceiling height, and insulation quality. Use it to size an air conditioner, heat pump, or furnace before purchasing.
Fill in the required fields to see your result.
Key differences
| HVAC BTU Room Sizing Calculator | HVAC BTU Calculator | |
|---|---|---|
| Category | Construction | Construction |
| Inputs required | 5 | 3 |
| Result | Cooling Capacity Needed (BTU/hr) | BTU Required (BTU/hr) |
| What it does | Size an air conditioner or mini-split to a room. Enter the room length and width, the ceiling height, choose the room's sun exposure, and add the number of regular occupants to estimate the cooling capacity in BTU per hour you need. | Estimates the BTU per hour needed to heat or cool a room based on its size, ceiling height, and insulation quality. Use it to size an air conditioner, heat pump, or furnace before purchasing. |