Heating & Insulation

Insulation batts and HVAC BTU sizing helpers for comfort and energy-efficiency planning.

Insulation CalculatorEstimate fiberglass batt count for walls, floors, or attics from net area and batt width. R-value is informational only.
HVAC BTU CalculatorRough-size heating and cooling load in BTU/hr from room dimensions and adjustment factors. Starting point only — not a Manual J replacement.