Compare calculators
Both calculators run independently β 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.
Construction
Insulation R-Value Calculator
Compute the total thermal resistance (R-value) of an insulation layer from its thickness and material-specific R-value per inch. Useful for meeting energy-code targets in walls, attics, basements, and floors.
Key differences
| HVAC BTU Room Sizing Calculator | Insulation R-Value Calculator | |
|---|---|---|
| Category | Construction | Construction |
| Inputs required | 5 | 2 |
| Result | Cooling Capacity Needed (BTU/hr) | Total R-Value (R) |
| 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. | Compute the total thermal resistance (R-value) of an insulation layer from its thickness and material-specific R-value per inch. Useful for meeting energy-code targets in walls, attics, basements, and floors. |