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Home Energy Calculators – Heat Loss
x402
Home Energy Calculators – Heat Loss is a paid API for AI agents from home-energy-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Calculates building heat loss in BTU/h and watts from surface areas and R-values plus optional air leakage, and estimates yearly energy from degree-days.
Price / call$0.02
Success—
StatusUnknown
How this service works
Heat loss of a building in BTU/h and watts from surface areas and R-values plus air leakage, and yearly energy from degree-days.
Output
Returns a per-surface breakdown including area, R-value, U-value, UA product, BTU/h loss, and share of total heat loss; plus totals in BTU/h, watts, and tons; air infiltration loss if volume and ACH provided; estimated annual energy if degree-days provided; and a plain-English summary with disclaimer.
Example use cases
Sizing a furnace for a new home
“I'm building a 2000 sq ft house and need to size the furnace. Walls are 1400 sq ft at R-15, windows are 200 sq ft at R-3, roof is 2000 sq ft at R-49. Indoor temp is 68°F, outdoor design temp is 5°F, heated volume is 18000 cubic feet at 0.3 air changes per hour. What's the total heat loss in BTU/h?”
Comparing insulation upgrade savings
“My current attic is 900 sq ft at R-19 and walls are 800 sq ft at R-11, with 100 sq ft windows at R-2. Indoor is 70°F, outdoor design is 15°F. I have 4800 heating degree-days. Can you calculate the heat loss and annual energy so I can see how much upgrading the insulation would save?”
Diagnosing a leaky older building
“I have an older drafty office — 2000 sq ft of walls at R-8, 300 sq ft of single-pane windows at R-1, 2000 sq ft roof at R-20. Indoor 70°F, outdoor design -5°F, volume is 25000 cubic feet with 1.2 air changes per hour and 6000 heating degree-days. What's the total heat loss and which surface is losing the most heat?”
Technical details
Endpoint
GEThttps://home-energy-calc.x402tookit.com/heat-loss?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a physics-based, per-surface heat loss calculation for a building — especially when you have specific R-values and surface areas and want BTU/h results suitable for HVAC sizing or energy auditing. It is more detailed than a rule-of-thumb estimator and handles both conductive and infiltration losses plus annual energy from degree-days, making it ideal for design, auditing, or insulation upgrade analysis.
Side effects
- Missing required surfaces, indoorF, or outdoorF parameters returns an error
- Malformed surfaces string (wrong delimiter or missing fields) causes a parse error
- R-value of zero causes division-by-zero and likely an error or infinite result
- Temperatures out of range (-60 to 130°F outdoor, 40 to 90°F indoor) may be rejected
- Providing volumeCuFt without airChangesPerHour or vice versa omits infiltration calculation
- Providing heatingDegreeDaysF without valid surface data will not produce annual energy output
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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