Frequently Asked Questions

At Calcs-Plus, we’re always finding solutions to help our clients build energy-efficient, code-compliant HVAC systems. Our clients benefit greatly from our various services,but they also come to us with plenty of questions ahead of time. See below for some of the most frequently asked questions our clients have and the answers you may be seeking:

What residential services does Calcs-Plus provide?

A: We specialize in 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.

Do you install HVAC systems or sell equipment?

No, we are a calculations and design firm only. We provide professional engineering services to support permitting, construction, and energy code compliance—without selling or installing any HVAC equipment.

How quickly can I get my calculations and designs completed?

Typical turnaround times are 3-5 business days for load and energy calculations. System design turnaround is 10–15 business days, depending on project size and complexity.

Are your calculations and designs accepted by building departments in Florida?

Yes, our load calculations, duct designs, and engineered HVAC plans are prepared in compliance with Florida Building Code and are accepted by permitting offices throughout the state.

Do you provide sealed mechanical plans?

Yes, Calcs-Plus is a licensed engineering company in Florida and offers signed and sealed HVAC mechanical plans when required for permitting.

Do you offer energy compliance testing like blower door, duct leakage tests?

Yes, we provide blower door testing (also known as envelope leakage testing) and duct leakage testing services for code compliance.

What areas do you serve?

While we primarily serve Florida builders, contractors, and homeowners, we can assist with projects throughout the southeastern United States upon request.

How do I get started?

Contact us by phone, email, or through our website to discuss your project. We’ll gather basic information, provide a quote, and get your project started quickly.

HVAC Load Calculations FAQ

What is a Manual J calculation?

A Manual J is a standardized method developed by ACCA to calculate a building's heating and cooling needs based on its specific design, materials, and usage.

Is a Manual J required in Florida?

Yes. Florida requires a Manual J load calculation for new residential buildings before a permit can be issued. It’s also recommended for major renovations or system replacements.

Can I use a "rule of thumb" instead?

No—those estimates are often inaccurate. Manual J is the industry-standard method recognized by code officials and energy programs.

How long does it take?

Most reports are completed within 3–5 business days after receiving your complete plans.

Do I need a Manual D too?

If you need duct design (layouts, sizes, etc.), we can also provide Manual D duct system design along with the Manual J report.

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What Our Clients Are Saying

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Tampa, FL

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Tampa, FL

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Paul Smith

Tampa, FL