For Builders · GCs · Architects · Developers
Free Manual J Load Calculation. Professional Report. 48-Hour Turnaround.
Stop guessing on equipment sizing. Submit your plans and get a complete ACCA-compliant Manual J, Manual S, and Manual D report — free, with no obligation. Most HVAC companies charge $300–$800 for this. We provide it free because right-sized systems are better for everyone.
No cost · No obligation · Southern California & Greater LA
Free
No cost, no strings
48hr
Turnaround time
ACCA
Compliant reports
10+
Years experience
What You Receive
A Complete Engineering Package — Not Just a Number
Every free Manual J submission includes the full ACCA Manual J/S/D suite. You get everything you need to spec, permit, and install correctly.
Manual J — Load Calculation
ACCA-compliant heating and cooling load analysis based on your plans, insulation specs, window schedules, and local climate data.
Manual S — Equipment Selection
Right-sized equipment recommendations with efficiency ratings, so you spec the correct unit the first time.
Manual D — Duct Design Guidance
Duct sizing and layout recommendations to ensure proper airflow to every room in the structure.
Professional PDF Report
A formatted report suitable for permit submission, client presentation, and subcontractor coordination.
48-Hour Turnaround Guaranteed
Submit your plans today. Receive your professional PDF report within 48 hours — most are completed same-day.
Why It Matters
Most HVAC Systems Are Oversized by 30–50%. Here's What That Costs You.
The industry standard is to guess — or use a simple square footage rule of thumb. The result is equipment that's too large, too small, or simply wrong for the building. That becomes your problem when the client calls with complaints.
Oversized systems that short-cycle, waste energy, and fail early
Undersized systems that can't maintain comfort on extreme days
Humidity problems from improper equipment sizing
Failed inspections due to non-compliant load calculations
Callbacks and warranty claims from dissatisfied clients
$300–$800
what others charge for this. We provide it free.
4.9 stars · Trusted by builders and GCs across Southern California
"We've used Breezy on three custom builds now. They show up prepared, coordinate with our trades, and the systems pass inspection first time. That's rare."
David K.
Laguna Beach · Custom Home Builder
"The free Manual J saved us from oversizing a $28,000 system. Their report was detailed enough to submit for permit without any revisions. First time that's happened."
Marcus T.
Newport Beach · General Contractor
"Most HVAC contractors just guess on sizing. Breezy actually runs the numbers. Their calculations have been accurate on every project we've collaborated on."
Richard P.
Corona del Mar · Architect
How It Works
Three steps. No back-and-forth. No surprises.
01
Submit Your Plans
Upload your PDF blueprints or architectural drawings below. Include the project zip code and any relevant specs (insulation, windows, orientation).
02
We Run the Numbers
Our team performs ACCA-compliant Manual J/S/D calculations using professional load calculation software and your local climate data.
03
Receive Your Report
You receive a professional PDF report within 48 hours — suitable for permit submission, client presentation, and subcontractor coordination.
Submit Your Plans
Fill in your project details below. Attach your plans if you have them ready — or we'll follow up to collect them.
Prefer to talk through your project first?
(714) 606-0814Why Free? Because Right-Sized Systems Are Better for Everyone.
We provide free Manual J calculations because we believe every project deserves properly sized equipment. When systems are sized correctly, they perform better, last longer, and generate fewer callbacks. That's good for your clients, good for your reputation, and good for us.
No strings. No obligation. Just accurate engineering.