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Home Energy Calculators – Insulation R-Value & U-Factor
x402
Home Energy Calculators – Insulation R-Value & U-Factor 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 2026-10-30).
Calculates the total R-value and U-factor of a wall or roof assembly from material layers and thickness, with optional framing-fraction correction and heat flow computation.
Price / call$0.02
Success—
StatusUnknown
How this service works
R-value and U-factor of a wall or roof assembly from layers and thickness, with a framing-fraction correction and heat flow.
Output
Returns the total assembly R-value, U-factor, a breakdown of R-value per layer (with source and thickness), the framing-corrected effective R-value and U-factor when a cavity and framing fraction are provided, and optionally the heat flow in BTU/h when area and temperature difference are supplied.
Example use cases
Check wall insulation before renovation
“I'm renovating my living room and want to know the total R-value and U-factor of the existing wall: half-inch drywall, 3.5-inch fiberglass batt, and half-inch plywood sheathing, with 16-inch stud spacing (about 25% framing fraction). Include air films please.”
Estimate heat loss through insulated ceiling
“My attic ceiling is 800 square feet. The assembly is 0.5-inch drywall plus 6 inches of cellulose loose-fill. It's 35°F outside and 70°F inside. Can you compute the R-value, U-factor, and total heat flow through that ceiling?”
Compare closed-cell spray foam roof assembly
“What R-value and U-factor would I get from a roof assembly of 0.5-inch drywall, 3.5-inch closed-cell spray foam cavity, and 1-inch polyiso board? Use a 15% framing fraction and 3.5-inch framing depth, and add interior and exterior air films.”
Technical details
Endpoint
GEThttps://home-energy-calc.x402tookit.com/insulation-r-value?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to compute the thermal resistance (R-value) and conductance (U-factor) of a specific wall or roof assembly from its constituent material layers, especially when framing members are present and a parallel-path correction is needed. It is more appropriate than a generic heat-loss calculator when the goal is to evaluate or compare insulation assemblies layer by layer rather than estimate whole-building energy loads.
Side effects
- Missing required 'layers' parameter returns a validation error
- Unrecognized material name in layers string may return null R for that layer
- framingFractionPercent outside the 5–40 range may produce unexpected results
- Very thin or zero thickness values may yield near-zero layer R-values
- Malformed layers string (wrong delimiter or format) may fail to parse any layers
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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