Free for Builders, GCs & Homeowners
Most HVAC Systems Are Improperly Sized.
Yours Won't Be.
Upload your blueprints. Get a free, ACCA-compliant Manual J report with equipment sizing and duct design — delivered in 48 hours.
Other companies charge $300–$800 for this. We do it free because every building deserves properly sized equipment — and we'd rather earn your business through competence.
The Hidden Cost of Guesswork
50% of HVAC Systems in the U.S. Are Oversized. Here's Why That Costs You.
Without a proper Manual J calculation, most contractors use "rule of thumb" sizing — 400–500 sq ft per ton. That method ignores insulation, windows, orientation, duct losses, and local climate data. The result? Equipment that's too big, too expensive, and fails too soon.
Higher Energy Bills
Oversized systems short-cycle — turning on and off rapidly instead of running efficient, steady cycles. This wastes 20–30% more energy than a properly sized system.
Humidity & Comfort Issues
Short-cycling means the system never runs long enough to dehumidify. You end up cold and clammy, or constantly adjusting the thermostat.
Premature Equipment Failure
Constant on/off cycling wears out compressors, contactors, and fan motors years before their rated lifespan. You're replacing a $15K system in 8 years instead of 15.
Simple 3-Step Process
Upload. Calculate. Build Right.
We use ACCA-approved methodology powered by AutoHVAC.ai to deliver professional-grade load calculations faster than anyone in the industry.
Upload Your Plans
Submit your blueprint or architectural drawing (PDF, DWG, DXF, JPG, PNG) along with the project zip code. That's all we need to get started.
We Run the Numbers
Our team processes your plans through ACCA-compliant Manual J methodology, factoring in construction type, insulation, windows, orientation, and local climate data.
Get Your Report
Within 48 hours, you receive a professional PDF report with load calculations, equipment sizing (Manual S), and duct design guidance (Manual D).
Your Report Includes
Not Just a Number. A Complete Engineering Package.
Manual J Load Calculation
Room-by-room heating and cooling load analysis based on your building's actual construction.
Equipment Sizing (Manual S)
Specific equipment recommendations matched to your calculated loads — not guesswork.
Duct Design Guidance (Manual D)
CFM requirements per room, duct sizing recommendations, and static pressure budgets.
Climate-Specific Data
Calculations use ASHRAE design conditions for your exact zip code — not regional averages.
Professional PDF Report
A clean, presentation-ready document you can share with inspectors, builders, or homeowners.
Equipment Options
Multiple equipment options at different price points so you can make informed decisions.
Built for Everyone Who Builds
Whether You're Building New or Replacing Old
Builders & GCs
Get accurate load calcs for every project. Pass inspection first time. Differentiate your builds with properly sized HVAC.
Architects
Integrate HVAC sizing into your design phase. Avoid costly change orders from improperly sized mechanical systems.
Homeowners
Make sure your new system is the right size. Stop paying for oversized equipment that wastes energy and fails early.
Developers
Scale load calculations across multi-unit projects. Get consistent, professional reports for every unit in the development.
Get Started — It's Free
Upload Your Plans. Get Your Report in 48 Hours.
No payment required. No obligation. Just accurate load calculations.
What to Expect
Upload plans → receive calculations within 48 hours
100% remote — no site visit required for plan-based calcs
ACCA-compliant calculations you can submit to permitting
Detailed load report with equipment sizing recommendations
Honest assessment guarantee: If we inspect your system and determine you don't need a Manual J calculation, we'll tell you. We'd rather earn your trust than your money.
Real Results
What Our Clients Say About Proper Load Calculations
"Three other HVAC companies told us we needed a 5-ton unit. Breezy ran the Manual J and proved we only needed 3.5 tons. Saved us thousands on the equipment AND our energy bills are lower. This is what honest HVAC looks like."
The Rodriguez Family
Irvine \u00b7 Manual J · Right-Sizing
"We've used Breezy on three custom builds now. They show up prepared, coordinate with our trades, and the systems pass inspection first time. Their Manual J calculations are the reason our HVAC designs work from day one."
David K.
Laguna Beach \u00b7 Builder · Load Calcs
"Our new home had hot and cold spots everywhere. Breezy ran a proper load calculation and found the original installer oversized the system by 40%. After right-sizing, every room is comfortable for the first time. I wish we'd found them sooner."
Patricia W.
Dana Point \u00b7 Homeowner · Comfort
Common Questions
Manual J FAQ
Stop Guessing. Start Calculating.
Every improperly sized system costs thousands in wasted energy, comfort problems, and premature failure. Get the math right — for free.