HVAC Load Calc: Manual J

Right-size any residential system in seconds. HVAC Load Calc runs a whole-house block load (the Manual J method) from a few envelope inputs — no spreadsheets, no guesswork. Every subscription starts with a free trial. After the trial, HVAC Load Calc requires a subscription — everything described below is a subscriber-only feature. ENTER THE HOUSE - Floor area, ceiling height, and climate (built-in design temps for major US cities) - Insulation presets for walls, ceiling, and floor — or your own U-values - Window area and glazing type, air tightness, and occupants GET THE LOAD - Design HEATING load (BTU/h) - Design COOLING load, split into SENSIBLE and LATENT (BTU/h) - Recommended equipment TONNAGE, with a sanity check that flags oversizing KEEP THE JOB - Save a calculation under the job name and reopen it later with every input intact - The list shows each job's loads and tonnage, so you can find one without opening it - Everything stays on the device — no account, no sign-in HAND OVER A REPORT - A one-page PDF: design loads, equipment size, and every input behind them - Look at the page before you send it, then share it like any other file ON IPAD - The form and the report side by side, updating as you work BUILT ON REAL PHYSICS - Textbook ASHRAE heat transfer: envelope conduction, infiltration, solar and internal gains — the same basis as ACCA Manual J block load. - Transparent assumptions you can adjust, not a black box. Cancel anytime in Settings. Engineering reference only — a whole-house block load, not a substitute for a certified room-by-room Manual J or professional engineering judgment. Terms: https://manualj.vovaluka.com/terms Privacy: https://manualj.vovaluka.com/privacy