Reference

Garage heat reference

Insulation codes, sample volumes, and worked BTU checks for common US garages and cabins.

1→0.093, 2→0.113, 3→0.133, 4→0.153, 5→0.173.

Details

Use 4–5 for uninsulated doors, single-pane glass, or frequent door openings in design cold.

Tools

3,520 ft³ × 0.133 × 40 ≈ 18,726 BTU/h → 8 kW class.

Details

Enter length 20, width 22, height 8, insulation 3, delta_t 40.

Tools

360 ft³ × 0.113 × 40 ≈ 1,627 BTU/h → 2 kW class.

Details

Bare metal vans should use insulation 5 until insulated.

Guides

1,920 ft³ × 0.133 × 40 ≈ 10,214 BTU/h → 5 kW class.

Details

Raise ΔT if you work during colder design nights.

Reference

2 / 5 / 8 kW ceilings and NO_MATCH path.

Guides

Guides, calculator, and comparisons.