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Comprehensive HVAC Calculation Services and HVAC System & Duct Design Work in Florida

With decades of experience and thousands of completed projects to our name, Calcs-Plus has proven time and again to be the most effective provider of HVAC calculation services, as well as HVAC duct and system design services, in the state of Florida. We specialize in residential and commercial HVAC load calculations (Manual J), system sizing (Manual S), duct design (Manual D), energy compliance reports for Florida Energy Code (including Form R405/C405), and sealed mechanical HVAC plans, but we also offer the professional engineering services you need to support permitting, construction, and energy code compliance.

Commercial Services

We use ACCA and ASHRAE guidelines for load calculation for commercial and light commercial buildings, as well as HVAC duct and system design services for light commercial buildings.

HVAC Load Calculations

Our residential HVAC load calculation services are based upon Manual J®, and this service is required by the State of Florida for all new residential buildings prior to permitting.

Energy Code Calculations

We use EnergyGauge software to determine whether newly built single- and multi-family homes are in compliance with local energy codes, and to plan prescriptive pathways when adding or renovating existing spaces.

HVAC Duct/System Design

The Calcs-Plus team can design a new HVAC duct system for your light commercial building or your home, ensuring proper air flow can be delivered to all areas of the building.

Blower Door Testing

This testing is crucial for measuring the airtightness of buildings, and it’s required in order to comply with Florida Energy Code and obtain a Certificate of Occupancy.

Duct Leakage Testing

After your blower door test, we can complete duct leakage testing to detect and address any leaks in your HVAC system’s air ducts that could reduce energy efficiency and indoor air quality.

Annual Energy Diagnostics

Having an annual energy calculation completed is necessary to estimate how much power is required to meet your building’s needs and to determine the correct sizing for solar or generator power systems.

Acoustics, Noise & Vibration Control

Calcs-Plus works with Vintec Acoustics to deliver acoustic services, noise and vibration control assessment and design, and electroacoustic system design services throughout the continental United States.

How Our Background Helps Us Provide Top-Quality HVAC Calculation & Design Services

Since 1991, we at Calcs-Plus have seen and adapted to countless changes to Florida Building Code and energy standards. Add in the fact that we are a licensed engineering firm, and you’ll find that we have an unmatched understanding of HVAC systems. We understand how they’re actually installed, inspected, and used, so we create designs that don’t just work on paper alone—they fit reality and are far more likely to get approved.

Setting the Standard for HVAC Load & Energy Calculation Services

Our mission is to give all our residential and commercial clients the best of both worlds: speed and precision. Most other HVAC calculation companies can give you one, but not the other. With Calcs-Plus, you can expect:

  • Calculation turnaround times of three to five business days
  • Designs completed within 14 days
  • No redlines or rework
  • Systems that are always designed to meet permitting requirements
  • A forward-thinking approach that solves potential code issues before they become problems

Calcs-Plus is ready to become a trusted partner that saves your time, your money, and your reputation with Florida-specific services that are practical, passable, and buildable.

Permit-Ready HVAC Solutions

Five-Star Reviews

What Our Clients Are Saying

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Paul Smith

Tampa, FL

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Paul Smith

Tampa, FL

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Paul Smith

Tampa, FL