Question 1

What is a Manual J calculation?

Accepted Answer

A Manual J calculation is a room-by-room heating and cooling load analysis performed according to ACCA (Air Conditioning Contractors of America) standards. It determines exactly how much heating and cooling capacity your building needs based on its actual construction, orientation, climate zone, and occupancy. This is the foundation for proper HVAC system design.

Question 2

When do I need Manual D and Manual S?

Accepted Answer

Manual D (duct design) and Manual S (equipment selection) are needed when you're designing a complete HVAC system—not just sizing equipment. If you're building new, redesigning ductwork, adding to a home, or need permit-ready documentation, you should include D and S with your Manual J. If you're simply replacing existing equipment without changing ductwork, Manual J alone may be sufficient.

Question 3

Do you serve all U.S. states?

Accepted Answer

Yes. Right Check serves clients across all 50 states. Our work is done remotely using your project plans and documentation, so location is not a limitation. We adjust all calculations for your specific climate zone, altitude, and local code requirements.

Question 4

Do you work with homeowners or only contractors?

Accepted Answer

We work with everyone—homeowners, builders, HVAC contractors, and architects. Many homeowners come to us for independent load calculations before purchasing new equipment, ensuring they get properly sized systems regardless of contractor recommendations.

Question 5

Can you help with permit-ready documentation?

Accepted Answer

Absolutely. Our calculations and reports are formatted for permit submission and include all documentation typically required by building departments. Our J + D + S package is specifically designed to provide a complete, permit-ready HVAC design package.

Question 6

What files do you need to start?

Accepted Answer

We need your floor plans (PDF preferred), building elevations or sections if available, and any relevant construction specifications (insulation values, window schedules, etc.). For existing buildings, photos of the mechanical equipment and ductwork are helpful. We'll let you know if we need additional information after reviewing your submission.

Question 7

How long does delivery take?

Accepted Answer

Most projects are completed within 3–7 business days, depending on complexity, project size, and current volume. Rush delivery is available for time-sensitive projects—contact us to discuss your timeline.

Question 8

What is the difference between equipment replacement and system redesign?

Accepted Answer

Equipment replacement means swapping out your existing HVAC unit for a new one, typically using the existing ductwork. A system redesign involves re-engineering the entire HVAC system—including duct sizing, equipment selection, and air distribution. Replacements usually need only Manual J, while redesigns require the full J + D + S package.

Question 9

Do you provide REScheck and COMcheck reports?

Accepted Answer

Yes. We provide both REScheck (residential) and COMcheck (commercial) energy code compliance reports. These are required for building permit applications in most jurisdictions and verify that your building's envelope, lighting, and mechanical systems meet applicable energy codes.

Question 10

What makes Right Check different from low-cost online services?

Accepted Answer

Low-cost services typically use generic default inputs and minimal review time to produce calculations quickly and cheaply. Right Check brings 30+ years of hands-on HVAC experience to every project. We verify inputs, account for real construction conditions, and design for constructability—not just software output. Our calculations are backed by someone who has actually installed systems in the field.

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