Manuals and Energy Calculations in Ocala: The Complete Submittal Package for Marion County Builders

For a residential building permit in Marion County, the energy compliance documents form a single submittal package — not standalone files. Each document depends on the others, and Ocala permit reviewers check that the numbers across all of them are internally consistent. Understanding the package as a whole makes it easier to assemble correctly and harder to get bounced.

This article walks through the four documents that typically make up an energy package for new residential construction in Ocala and the rest of Marion County, what each one covers, and how they connect. For the broader new-construction timeline, see our Marion County new construction energy testing guide.

The Four Documents That Make Up an Energy Package

A complete energy compliance package for a Marion County residential permit usually includes:

1. Manual J — heating and cooling load calculation
2. Manual S — HVAC equipment selection based on Manual J output
3. Manual D — duct system design and sizing
4. Form R405-2023 — Florida Energy Code compliance form (the EPL Index calculation)

Each is an ACCA or Florida-specific document. They reference each other and must be internally consistent. Submitting one without the others — or submitting versions that don’t match — is the most common cause of energy package rejection.

Document 1: Manual J (Load Calculation)

Manual J calculates the heating and cooling loads of the home in BTU/hr. It’s the foundation everything else builds on.

Inputs:

• Conditioned square footage and ceiling heights
• Wall, ceiling, floor R-values from the assembly schedule
• Window U-values, SHGC ratings, sizes, and orientations
• Infiltration rate (target ACH50 from the blower door test design)
• Internal heat gains (people, lighting, appliances)
• Duct location and load

Outputs:

• Total sensible cooling load (BTU/hr)
• Total latent cooling load (BTU/hr)
• Total heating load (BTU/hr)
• Room-by-room load breakdown for register sizing

A typical Marion County new construction home (single-family, 2,000 sq ft, code-compliant assemblies) shows roughly 22,000–28,000 BTU/hr total cooling load, with latent representing 25–35% of that. Heating loads are much smaller — typically 12,000–18,000 BTU/hr — because of Ocala’s Climate Zone 2 designation.

Document 2: Manual S (Equipment Selection)

Manual S takes the Manual J output and selects the actual HVAC equipment to match it. The selection has to fall within ACCA-specified ranges:

• Sensible cooling capacity: 90–115% of Manual J sensible load
• Total cooling capacity: ≤125% of Manual J total load
• Heating capacity (heat pump): ≤125% of Manual J heating load
• Heating capacity (electric backup): 100% of Manual J heating load when used

The output of Manual S is a specific make and model of equipment with AHRI certified ratings, matched to the calculated loads. For Climate Zone 2 — which includes all of Ocala and Marion County — variable-speed and two-stage equipment often selects better than single-stage because of how the latent load curve interacts with the cooling load curve.

Document 3: Manual D (Duct Design)

Manual D sizes the duct system based on the equipment airflow (selected via Manual S) and the room-by-room loads (calculated via Manual J).

Inputs:

• Equipment airflow (CFM) from Manual S
• Room CFM requirements from Manual J room-by-room
• Duct layout from the architectural / mechanical plans
• Friction rate target (typically 0.08 in. wg / 100 ft)
• Static pressure budget (typically 0.5 in. wg total external static)

Outputs:

• Trunk and branch duct sizes
• Register and grille sizes per room
• Total external static pressure check

In Florida, most ducts run through unconditioned attic space, which is why Manual D is critical — duct location significantly affects total system load, and Manual J needs the duct configuration to calculate accurately. This is also why duct leakage testing is required — see our envelope leakage testing guide for the field-test side.

Document 4: Form R405-2023 (Florida Energy Code Compliance)

Form R405-2023 is Florida’s energy code compliance document. It calculates the home’s predicted annual energy use and compares it against the code baseline, producing the EPL Index (Energy Performance Level Index).

Performance path: EPL Index must be ≤100 to comply (lower = better). Allows trade-offs between insulation, glazing, HVAC efficiency, water heater type, etc.

Prescriptive path: Every individual component must meet specific code minimums. No trade-offs allowed.

Most Florida builders use the performance path because it allows higher glazing percentages, mixed wall assemblies, and equipment-efficiency trades. The Form R405-2023 documents which path you’re using and shows the calculation.

How the Four Documents Connect

The dependency chain runs:

Manual J → Manual S → Manual D → Form R405-2023

If any input changes upstream, downstream documents need to be updated to match. Common scenarios:

• Builder switches from U-0.32 to U-0.40 windows mid-design → Manual J cooling load increases → Manual S may now select different equipment → Manual D airflow changes → Form R405-2023 must reflect the new window U-value
• HVAC contractor selects a different model than Manual S specifies → all downstream documents need revision to match the installed equipment
• Architect adds 200 sq ft of conditioned floor area → entire package needs updating

This is why builders working with multiple plans and option variations often choose a master set strategy — one comprehensive set of calculations covering each base plan with permutations baked in. It eliminates per-lot revision chains.

What Marion County Reviewers Specifically Check

Marion County Building Department reviewers tend to look at energy packages for:

Cross-document consistency. Does the Manual J window U-value match the Form R405-2023? Does Manual S equipment match the AHU listed in Manual D? Does the conditioned square footage match across all four documents?

ACCA-compliant format. Is the Manual J output in standard ACCA format with all required sections, or is it a non-conforming spreadsheet?

Florida-specific climate data. Was the calculation run using Florida weather data (Gainesville or Ocala station), or did it default to a non-Florida location?

Equipment within Manual S limits. Is the selected AC unit between 90–115% of sensible load and ≤125% of total load? Is the heat pump ≤125% of heating load?

Form R405-2023 signed and complete. All required fields filled, EPL Index ≤100 on performance path, or all prescriptive minimums met on prescriptive path.

How B&I Testing Delivers an Energy Package for Ocala Builders

B&I Testing delivers complete energy packages for new construction throughout Marion County. A standard package includes:

• Manual J load calculation (ACCA MJ8 compliant)
• Manual S equipment selection with AHRI certified ratings
• Manual D duct design with static pressure check
• Form R405-2023 with EPL Index calculation

All four documents are produced together, cross-checked for consistency, and delivered as a single permit-ready package. Turnaround is typically 3–5 business days for a single-family residence.

For master sets covering multiple plans with option variations, turnaround is longer but per-lot delivery is essentially instant once the master is built.

If you need an energy package for an Ocala new construction project, call (352) 756-2986, email brandon@banditesting.com, or reach us through the website.

Frequently Asked Questions

Do I need all four documents for every Marion County permit? Manual J, Manual S, and Form R405-2023 are required for nearly every new construction residential permit. Manual D is required when ducts run outside the conditioned space (which is nearly always the case in Florida).

Can I submit Form R405-2023 without Manual J? No. Form R405-2023 references the heating and cooling load values calculated by Manual J. Submitting one without the other will result in rejection.

What if I’m just replacing my HVAC equipment? Equipment-only replacements technically require Manual J and Manual S per the Florida code, even when it’s a like-for-like swap. Enforcement varies by jurisdiction, but Marion County generally requires the updated calculations.

How much does a complete energy package cost in Ocala? For a single-family new construction home, B&I Testing’s energy package pricing is project-specific based on plan complexity. Call (352) 756-2986 for a flat-rate quote.