Fast, Accurate HVAC Load Calculations — Nationwide Service
Load Calcs — Permit-Ready Residential HVAC Duct Design Services. ACCA Compliant. 30+ years of field expertise.
Get Started! →Load Calculations (Prices)
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Instant Pricing for Manual J Load Calcs (PLUS! Choose Equipment Selection Manual S) & Send Your Plans Right from Upload
We accept architectural drawings, specs, or sketches with dimensions. - Your home or building is modeled in WrightSoft software using ACCA Manual J standards.
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Receive the Report
You’ll get a clear, permit-ready PDF report with all required data and recommendations. -
(Optional) Add Full HVAC System and Duct Design
Need duct layouts and equipment schedules? We can provide a complete design package.
An HVAC load calculation is the math that sizes a heating and cooling system to your house — its windows, insulation, direction it faces, air leakage, and local weather — instead of its square footage. We do the full ACCA process: Manual J finds the load, Manual S picks the equipment, and Manual D designs the ducts.
Why does the wrong size cause so many problems?
Because an air conditioner does two jobs — it cools the air and it pulls moisture out of it — and an oversized one only does the first. It blasts the room cold in a few minutes, hits the thermostat, and shuts off before it ever dries the air.
Bigger is not safer. An oversized system short-cycles, leaves humidity behind, runs up your power bill, and fails sooner.
How do you get the size right?
Three calculations, in order, each one feeding the next.
What do you actually get?
You get permit-ready reports a builder, contractor, or inspector can use: the load, the equipment selection, and the duct design.
Who runs the numbers matters
We use Wrightsoft Right-Suite Universal, the ACCA-approved software standard. But software only calculates what it is told. The skill is knowing what to enter and whether the result makes sense.
The details a rule of thumb never sees
Square footage cannot tell you what actually makes a house comfortable. These details matter:
Heat Gain & Heat Loss
Where heat enters, where it leaves, and why humidity matters.
Hot & Humid Climates
Why sticky climates need better latent-load math.
Airtight Homes & Ventilation
Build tight, ventilate right.
Range Hood Makeup Air
Why large kitchen hoods can create pressure problems.
Who we work with
We work with builders, contractors, designers, and homeowners nationwide. Houses are our specialty, and we also take on select light commercial projects.
Frequently Asked Questions
What is an HVAC load calculation?
An HVAC load calculation determines how much heating and cooling a specific home needs based on construction, windows, air leakage, orientation, room sizes, and local climate.
Why can’t I just match the size of my old system?
The old system may have been wrong from the beginning. The home may also have changed because of new windows, insulation, additions, renovations, or air sealing.
What is wrong with an oversized air conditioner?
An oversized air conditioner cools too quickly and shuts off before removing enough humidity. That can leave the home cold but clammy.
What is Manual J?
Manual J is the residential load calculation method used to determine the heating and cooling needs of each room.
What is Manual S?
Manual S is the equipment selection step. It uses the Manual J load to choose heating and cooling equipment that matches the home.
What is Manual D?
Manual D is the duct design step. It sizes trunks, branches, returns, and supplies so each room receives the correct airflow.
Do you work nationwide?
Yes. We work remotely with homeowners, builders, contractors, and designers across the United States.
What do you need to get started?
We typically need floor plans, project location, window information, construction details, insulation values, and known equipment preferences.
Send us your plans — get a system that fits your home
A complete Manual J, Manual S, and Manual D design package sized to your actual house.
See pricing & start your project →Licensed. Certified. Accredited & 30+ Yrs of HVAC Design
We work closely with homeowners, builders, and architects to find cost-effective solutions while prioritizing energy efficiency. Because of our commitment, we consistently deliver exceptional results. We utilize Wrightsoft Software to ensure every Manual J heat gain/loss analysis is optimized for high-efficiency inverter systems and geothermal applications. Additionally, our extensive industry expertise ensures reliable and efficient solutions. Therefore, clients trust us to meet their unique needs with precision. The team's dedication sets us apart in the industry.