Home / HVAC contractors
For HVAC contractors
Your design department, paid per project.
Send us the plans when you land a job. We send back Manual J, D and S, modeled in Wrightsoft and ready for permit. No designer on payroll, no software licenses, no salary in a slow week.
The problem
Design work doesn't come in steady.
A designer costs the same in a slow month
Salary, payroll taxes, software and training keep running when the jobs don't.
Rule-of-thumb sizing comes back on you
An oversized unit short cycles and leaves the house humid. The comfort complaint lands on your crew.
The permit office wants the report
The IRC calls for Manual J and S sizing, and many building departments ask to see it before they issue the permit.
How AG3 helps
Send plans. Get a permit-ready design back.
You keep the customer and the install. We do the engineering behind it, the same way on every project, and you only pay for the jobs you send.
- J·S·DManual J, S and DRoom by room loads, equipment checked against them, and a duct layout sized for each room's airflow.
- PDFOne permit-ready PDFEverything for the building department in one report.
- BOMBill of materialsPulled from the design by our AG3 Estimating Platform. Added to the HVAC Design Package at $95 per engineering hour, and included for partners. Send your supplier price list and we'll price it for you.
- EQYour equipment, checkedAlready quoted a unit? Manual S tells you if it fits the loads, and what does if it doesn't.
- EN/ESTalk to the engineerYou deal with Rafael, the mechanical engineer on your project, in English or Spanish.
Partner program
Send 5 a month, save on every one.
Keep 5 or more projects a month coming and you get 12% off every project and the bill of materials at no charge. Keep the minimum to keep both.
Partner program: 12% off for contractors and builders with at least 5 projects per month, and the BOM at no cost for HVAC contractors.
every month
project
Pricing
What contractors order most.
Starting prices up to 2,000 sq ft. Your final price is in the estimate, after we see the plans.
Manual J
- Room by room loads
- +$0.06 per sq ft over 2,000
- Delivered in 2 to 3 business days
- 1 revision included
Manual J & S
- Loads plus equipment selection
- +$0.06 per sq ft over 2,000
- Delivered in 2 to 3 business days
- 1 revision included
HVAC Design Package
- Manual J, D and S in one PDF
- +$0.08 per sq ft over 2,000
- Delivered in 3 to 5 business days
- 1 revision included
How we work
From plans to permit in four steps.
- 01
Send your plans
Upload the floor plan and whatever specs you have. We'll ask for anything missing.
- 02
Get your estimate
We review the plans and send a fixed price with a delivery date before any work starts.
- 03
We model it
The house goes into Wrightsoft room by room to size every duct and unit.
- 04
Check and deliver
We check the design against ACCA, ANSI and ASHRAE methods and send the permit-ready PDF.
Contractor questions
Before you send the first job.
Do you work with contractors outside Texas?
Yes. We're based in Dallas-Fort Worth, and the design work happens online, so we take projects across the US.
How does the partner discount work?
Send 5 or more projects a month and you get 12% off every project, and the bill of materials is included at no charge. Keep the minimum each month to keep both active.
Can you check the equipment I already quoted?
Yes. Tell us the brand, model or AHRI number in the form. Manual S checks it against the loads, and if it doesn't fit we'll tell you what size does.
How does the bill of materials work?
It comes with the HVAC Design Package, since it needs the Manual J loads and the Manual D duct design. It's billed per engineering hour at $95, and the estimate says how many hours. Partners get it at no charge.
How do I pay?
We invoice when we deliver, due in 15 days. You can pay by Zelle, bank transfer or check.
Ready when you are
Let's size it right the first time.
Send your plans today and get an estimate back.