What is the difference between REScheck and Manual J?

REScheck and Manual J are two different energy-related reports required for residential construction. REScheck is an energy code compliance report that proves your home's insulation, windows, and doors meet IECC standards — it is required for building permits on new homes and additions. Manual J is an HVAC load calculation that determines the correct heating and cooling capacity your HVAC system needs — it is required before installing or replacing HVAC equipment. Many building departments require both reports for new construction.

Do I need both REScheck and Manual J for a new home?

Often yes. REScheck covers the building envelope — insulation, windows, and air sealing — while Manual J covers HVAC sizing. Most building departments require both before issuing a permit for new residential construction. Rescheck Review can complete both reports together so you only need to provide your project details once.

What is a REScheck report and when do I need one?

A REScheck report is a residential energy code compliance document that demonstrates your home meets the International Energy Conservation Code (IECC). You need a REScheck when building a new home, adding square footage, replacing windows or insulation, or when your building department requests an energy compliance report for a residential permit.

What is a Manual J calculation and who needs it?

A Manual J calculation is an HVAC load calculation that determines exactly how much heating and cooling capacity a building requires. It is used to properly size HVAC equipment. HVAC contractors, builders, and homeowners need a Manual J report when installing or replacing a heating or cooling system, and when applying for a mechanical permit for new construction.

What is COMcheck and is it the same as REScheck?

COMcheck is not the same as REScheck. REScheck is for residential buildings, while COMcheck is the commercial equivalent. COMcheck covers building envelope, lighting, and mechanical systems for non-residential construction and must comply with IECC or ASHRAE 90.1. COMcheck is required for commercial new construction, tenant improvements, and retail or office projects.

My building permit office asked for an energy report — which one do I need?

If your project is residential, your building department almost certainly means a REScheck report when they ask for an 'energy report.' For commercial projects, they typically mean COMcheck. If you are unsure, contact Rescheck Review and we will identify the correct report for your jurisdiction at no charge.

How fast can I get a REScheck, Manual J, or COMcheck report?

Most REScheck, Manual J, and COMcheck reports from Rescheck Review are completed same-day or the next business day. Rush turnaround is available. We serve all 50 states and automatically use your local IECC climate zone.

What information do I need to order a REScheck report?

To order a REScheck report you will need: the project address (for the climate zone), total conditioned square footage, insulation R-values for walls, ceiling, and floor, and window and door specifications including U-factor and SHGC ratings. You can upload floor plans or spec sheets directly through the Rescheck Review order page.

What information do I need to order a Manual J report?

To order a Manual J HVAC load calculation you will need: the project address, floor plan dimensions, insulation R-values, window specifications (U-factor, SHGC, size), ceiling height, number of occupants, and HVAC equipment information if already selected. Rescheck Review accepts uploaded floor plans and can work from builder specs.

Are REScheck reports accepted in all 50 states?

Yes. REScheck is accepted by building departments in all 50 states because it uses the International Energy Conservation Code (IECC) as its standard, which has been adopted in some form across every state. Rescheck Review prepares reports that comply with your state and local jurisdiction's adopted code version.