Manual J & D Design · South Florida
Manual J Load Calculation & Manual D Duct Design in South Florida
In-house Manual J load calculations and Manual D duct designs, so your system is right-sized and every room gets the air it needs.
18+
Years in business
4.8★
229+ Google reviews
Licensed
FL #CAC1820211
A+
BBB Accredited
24 / 7
Emergency response
Why Swift AC
What you get with our manual j load calculation & manual d duct design.
Four things we don't compromise on, every job, every customer.
Why this matters
Built for the home you live in.
Your AC is not a piece of equipment. It is the difference between kids sleeping through hot August nights and a hallway fan war at 2 a.m.
We treat every install and repair the way we would want our own family taken care of. Properly sized systems. Honest diagnostics. Clean work that lasts. Because the people you love deserve a home that stays cool, dry, and comfortable, year after year, without you having to think about it.
Why Swift AC
The standard South Florida homeowners trust.
We earn our reputation one job at a time. Every system we install, every repair we make, every customer we serve carries our 100% satisfaction guarantee.
Current offers
Save on quality HVAC service.
Real, simple deals on the work you actually need. No mystery pricing, no bait and switch.
What customers say
4.8★ on Google with 229+ reviews.
We earn our reputation one job at a time. Here's what your neighbors are saying.
“When you are looking for a reliable, quick and honest HVAC team this is the company you want to deal with. Reach out, you will be wowed. Also, they are nice guys and will spend the time to explain your needs.”
David Ragheb
West Palm Beach
...and 226+ more on Google.
Book your manual j & d design in under 30 seconds.
A real Swift AC team member answers, every time. Same-day service across South Florida.
How we work
Our manual j & d design process.
A straightforward sequence built around clear communication, careful work, and standing behind every job.
- STEP 011
Home Survey
We measure every room and record windows, orientation, glass type, insulation, ceiling heights and where the ducts run.
- STEP 022
Manual J Load Calculation
We calculate each room's heat and moisture load, not just a single whole-house number.
- STEP 033
Manual S & Manual D Design
We select equipment for those loads and size every duct, return and register to deliver the right airflow.
- STEP 044
Install & Verify
Our crew builds to the design, and we measure airflow and temperatures to confirm every bedroom is within 3°F.
About this service
Manual J Load Calculation & Manual D Duct Design
Most air conditioners in South Florida were sized with a rule of thumb, so many tons for so many square feet, or simply matched to the unit they replaced. That shortcut ignores what really drives the load in a Florida home: window area and direction, glass type, shading, insulation, ceiling heights, duct location, air leakage and the moisture the system has to remove. An oversized system cools fast, shuts off and leaves the house clammy. An undersized one runs nonstop. And without a duct design, even a perfectly sized system can't get the right amount of air to each room.
Swift Air Conditioning does this work in-house, using the ACCA standards. Manual J is the room-by-room heating and cooling load calculation. Manual S uses those loads to select equipment with the right capacity and enough moisture removal for our climate. Manual D designs the duct system, sizing each supply, trunk and return so the blower can deliver the airflow each room needs. Manual T guides the choice of registers and grilles so the air mixes well in every room.
The design target is the comfort guideline in ACCA's Manual RS: each room within 3°F of the thermostat while cooling. We build every replacement and duct project to the design, then measure airflow and temperatures after installation to confirm it performs.
Florida's energy code calls for heating and cooling equipment in new homes to be sized with Manual S from a Manual J load calculation, and the residential code points to Manual D for duct design. We bring the same discipline to replacements, additions and renovations, because it's what makes a home comfortable. Call (561) 685-8408 to schedule an in-home visit.
Service area
Manual J Load Calculation & Manual D Duct Design across South Florida.
Same-day service across five counties and 30+ cities. Find your area below to see local pricing, response times, and customer reviews.
Where we provide Manual J & D Design across South Florida
We handle this work in every city from Vero Beach to Fort Lauderdale, and each city has its own page. Popular areas include Manual J & D Design in West Palm Beach, Manual J & D Design in Boca Raton, Manual J & D Design in Fort Lauderdale, Manual J & D Design in Wellington, Manual J & D Design in Delray Beach, and Manual J & D Design in Palm Beach Gardens.
Got questions?
Frequently asked questions
Manual J is the ACCA standard for calculating how much heating and cooling each room of a home needs. It accounts for walls, windows and their direction, glass type, shading, insulation, ceiling heights, duct location, air leakage and occupants, and it calculates the moisture load as well as the heat load.
Manual J calculates the loads. Manual S selects equipment that matches those loads, including enough moisture removal. Manual D designs the duct system that delivers the right airflow to each room, and Manual T guides register and grille selection. Used together, they produce a system that's sized right and delivers air evenly.
Because two homes of the same size can have very different loads. Window area and direction, shading, insulation, ceiling height and air leakage all change how much cooling a home needs. Square-footage rules often oversize systems, which leads to short cycles, clammy air and higher bills.
Florida's energy code requires heating and cooling equipment in new homes to be sized with ACCA Manual S based on a Manual J load calculation. Requirements for replacements vary by building department, but a load calculation is still the most reliable way to choose the right size, so we do one for the systems and duct projects we install.
The on-site survey usually takes an hour or two, depending on the size and layout of the home. We measure the rooms, check the attic and note any upgrades, then run the calculation and design. The results come with your replacement or duct quote.
Yes. Our own team runs the load calculations and duct designs for the systems and duct projects we install. The people who measure your home work with the crew that builds to the design, and we verify the finished system with airflow and temperature readings.
Related services
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Air Conditioning Installation
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Learn moreDuct Replacement
Whole-home duct replacement designed in-house with Manual J and Manual D, then sealed, insulated and balanced. Free in-home quote.
Learn moreAirflow Diagnostic & Duct Balancing Assessment
A measured airflow diagnostic for hot and cold rooms: static pressure, room-by-room airflow, duct leakage and thermal imaging, then balancing.
Learn more
Ready when you are
Comfort done right. Let's get started.
Free estimates on installs. Honest diagnostics on repairs. Same-day service across South Florida and a real human on the other end of the line, every time.
Service area
Palm Beach · Broward · Martin · St. Lucie
Licensed FL #CAC1820211