Frequently asked questions

Manual J is the ACCA-standard method for calculating room-by-room heating and cooling loads for residential buildings. It's the foundation for selecting properly sized HVAC equipment and the basis most building departments require for permits.

Most US states (29+) require an ACCA Manual J load calculation for new construction, additions, and equipment changeouts. Your AHJ (Authority Having Jurisdiction) sets the exact requirement — call your building department to confirm, or send us your project and we'll tell you.

Manual J calculates loads. Manual S selects the equipment to meet those loads. Manual D designs the duct system to deliver the right airflow to each room. Manual T sizes the registers and grilles for comfort and noise. They build on each other.

Residential Manual J reports are flat-quoted based on the project size and complexity. Send your plans for a same-day fixed quote.

Standard turnaround is 2–4 business days from when we have plans and project details. Rush turnaround (24–48 hours) is available as an add-on.

Yes. Our reports are ACCA Manual J 8th Edition–compliant and accepted in 29+ states on first submittal. If the AHJ requests revisions, we handle them at no extra charge.

Yes — we work across the US, Canada, and Mexico. Canadian projects can be calculated to CSA F280 on request.

Floor plans (PDF, DWG, or clear images), elevations if available, and a quick note on the project type and state. If something's missing we'll ask.