Upload your blueprint. Get a Manual J report following ACCA methodology with room-by-room loads and equipment sizing. No software to install, no training required.
No credit card required -- No software to download -- ACCA Manual J methodology
Three steps. 60 seconds. Permit-ready Manual J results.
Upload any blueprint PDF — floor plans, elevations, energy specs. Our AI reads them all automatically. Drag and drop or browse to upload.
Our two-brain AI system extracts dimensions, R-values, windows, orientation, and 30+ Manual J factors directly from your blueprint. No manual data entry.
Download a complete Manual J report with room-by-room heating and cooling loads, equipment sizing, and a permit-ready PDF. First report is free.
No account required for your first report
See why HVAC professionals are switching from expensive desktop software to AutoHVAC's free Manual J calculator.
| Feature | AutoHVACRecommended | Wrightsoft | CoolCalc | Elite RHVAC |
|---|---|---|---|---|
| Free Option | Free first report | No free option | Limited free | No free option |
| Monthly Cost | $47/mo after | $99-$199/mo | $49/mo | $499 one-time |
| Time per Calculation | 60 seconds | 30-60 minutes | 20-45 minutes | 45-90 minutes |
| AI Blueprint Reading | ||||
| Room-by-Room Loads | ||||
| Permit-Ready Reports | ||||
| No Software Install | ||||
| Mobile / Tablet | ||||
| Training Required | None required | 8+ hours | 2-4 hours | 4-8 hours |
No credit card required
Every report includes everything you need for proper HVAC sizing and permit approval.
Precise BTU/hr calculations for both heating and cooling, factoring in your local design temperatures and climate zone.
Individual load calculations for each room with CFM airflow requirements for proper duct design and balancing.
Professional documentation that meets ACCA standards and building department requirements. Ready to submit for permits.
Furnace capacity and AC tonnage recommendations based on your calculated loads. No more guessing on equipment size.
Contractors, engineers, and inspectors rely on AutoHVAC for fast, accurate Manual J calculations.
“AutoHVAC cut my bid prep time from 4 hours to 15 minutes. The calculations are spot-on and the reports look professional.”
“Finally, a tool that understands real-world HVAC design. The Manual J calculations match our in-house engineering, but delivered in seconds.”
“Contractors using AutoHVAC submit cleaner, more accurate plans. Fewer revision cycles mean faster permit approvals for everyone.”
Simple square-footage calculators ignore the factors that actually determine your HVAC load. That is why they are typically off by 30-50%.
Want a quick estimate before your full Manual J? Our BTU calculator and AC tonnage calculator give you a starting point -- then upload your blueprint for precise Manual J results.
Everything you need to know about getting a free Manual J calculation online.
Get instant, accurate HVAC load calculations with our free calculator.
Stop guessing at equipment sizes. Stop paying hundreds for Manual J reports. Upload your blueprint and get accurate, permit-ready results — first one is on us.
No credit card required -- No software to install -- ACCA Manual J methodology