Thermal Engineering
HVAC Cooling Load Estimator
Estimate cooling demands and sizing requirements for residential spaces. Configure structural insulation properties, occupancy details, fenestration totals, and export building heat balances.
Standard
ASHRAE Residential
Simple estimation
Mesh
50 design points
Real-time updates
Output
CSV
Load list ready
Parameters
Insulation efficiency
Animated area sweep
HVAC Sizing Specifications
Sensible Envelope Load
Q_envelope = Area * U_factor (15, 20, or 25 BTU/hr/sq ft)
Occupant Latent & Sensible
Q_occupants = Occupants * 400 BTU/hr
Solar Heat Gain (Fenestration)
Q_solar = Windows * 1000 BTU/hr
Total Cooling Capacity
Tons = Q_total / 12000 (1 Ton = 12,000 BTU/hr)
Sizing is estimated at 3.30 Tons for a floor area of 1500 sq ft.
Occupants contribute 1,600 BTU/hr, while solar gains add 8,000 BTU/hr to the system.
Thermal load computations correspond to simplified peak cooling load guidelines.
Thermal Boundary Model
Estimated HVAC Sizing
3.3Tons
Total Capacity Required
39600BTU/hr
Envelope & Duct Load
30000BTU/hr
Internal Occupancy Load
1600BTU/hr
Load Distribution Profile (Stacked Thermal Loads)
Area-Sized Cooling Load List
| Floor Area (sq ft) | Envelope Load (BTU/hr) | Occupant Load (BTU/hr) | Solar Load (BTU/hr) | Total Load (BTU/hr) | Capacity (Tons) |
|---|---|---|---|---|---|
| 100 | 2,000 | 1,600 | 8,000 | 11,600 | 0.97 |
| 500 | 10,000 | 1,600 | 8,000 | 19,600 | 1.63 |
| 900 | 18,000 | 1,600 | 8,000 | 27,600 | 2.30 |
| 1,300 | 26,000 | 1,600 | 8,000 | 35,600 | 2.97 |
| 1,700 | 34,000 | 1,600 | 8,000 | 43,600 | 3.63 |
| 2,100 | 42,000 | 1,600 | 8,000 | 51,600 | 4.30 |
| 2,500 | 50,000 | 1,600 | 8,000 | 59,600 | 4.97 |
| 2,900 | 58,000 | 1,600 | 8,000 | 67,600 | 5.63 |
| 3,300 | 66,000 | 1,600 | 8,000 | 75,600 | 6.30 |
| 3,700 | 74,000 | 1,600 | 8,000 | 83,600 | 6.97 |
| 4,100 | 82,000 | 1,600 | 8,000 | 91,600 | 7.63 |
| 4,500 | 90,000 | 1,600 | 8,000 | 99,600 | 8.30 |
| 4,900 | 98,000 | 1,600 | 8,000 | 1,07,600 | 8.97 |