ACCA Manual J · Manual S · Manual D

HVAC load calcs
built for the field.

Stop guessing tonnage. JLoadPro walks any tech through a complete Manual J calculation in minutes and produces a permit-ready report.

No credit card required - first calculation is completely free
850+
ASHRAE climate locations
4min
Avg. time to complete calc
100%
ACCA Manual J compliant
0x
Spreadsheets required
Features

Everything a tech needs.
Nothing they don't.

Built for contractors who need accurate results fast.

J
Full Manual J engine

Envelope, infiltration, solar, internal gains, duct losses - every ACCA variable calculated live as you type.

S
Manual S equipment sizing

Automatic equipment selection with capacity derating at real design conditions. No more AHRI-only sizing.

D
Manual D duct design

Room-by-room CFM, friction rate, and branch duct sizing from real loads - not rules of thumb.

Z
Zip code climate data

Auto-populates ASHRAE outdoor design conditions for 850+ locations the moment you enter a zip code.

R
Permit-ready PDF reports

Branded PDF with every input and result documented - ready for permit submission.

AR
AR photo measurement

Snap a photo of your tape measure, laser display, or blueprint. AI extracts the number and fills the field.

How it works

From address to answer
in four steps.

No engineering degree required. Just answer the prompts.

01 --
Enter the address

Type in the zip code. JLoadPro instantly pulls ASHRAE design temps, wet bulb, and climate zone automatically.

02 --
Describe the building

Walk through a guided form: construction type, insulation, window specs, square footage. Dropdowns pre-loaded with common assemblies.

03 --
Review the loads

See sensible and latent cooling, heating load, equipment size, and room-by-room CFM - all live as you type.

04 --
Export the report

Download a complete permit-ready PDF with your company logo and all inputs documented.

AR photo measurement

Snap a photo.
Skip the tape measure.

Point your phone at any room, window, or laser measure display. JLoadPro reads the dimensions automatically and fills the field. No more squinting at tape measures or re-entering numbers from a notepad.

Rooms and floor plans
Photograph a floor plan, blueprint, or hand-drawn sketch. AI reads the room dimensions and calculates square footage instantly.
Windows and doors
Snap the window frame or the label on the glass. JLoadPro extracts rough opening dimensions and adds them to the correct orientation automatically.
Laser measure displays
Got a Bosch, Leica, or Fluke laser? Point your camera at the screen - the reading transfers straight into the field, no typing required.
9:41
JLoadPro AR Ruler
14.5 ft
9 ft
DETECTED - LIVING ROOM
210 ft2
14.5 x 9 ft
high conf.
saves avg.
12 min
per job site
Pricing

Simple, transparent pricing.

Start free. Scale as your business grows.

Starter
$0
Free forever
  • 1 free calculation
  • Residential only
  • Full Manual J engine
  • PDF export
  • Equipment selection
  • Duct sizing
  • Team seats
Most popular
Pro
$49
per month
  • Unlimited projects
  • Residential + light commercial
  • Branded PDF reports
  • Manual S equipment sizing
  • Manual D duct sizing
  • VRF and heat pump tools
  • Team seats
Team
$149
per month, up to 5 users
  • Everything in Pro
  • 5 team seats
  • Company branding on reports
  • Shared project library
  • Priority support
  • API access
Early access

Be the first tech on JLoadPro.

Join the waitlist and get 3 months of Pro free when we launch publicly.

No spam. No credit card. Just your spot in line.

Pricing

Pick the plan that fits
your business.

All plans include the full Manual J engine. Upgrade anytime.

Starter
$0
Free forever - no credit card
  • 1 free calculation
  • Residential single-family
  • Full Manual J engine
  • PDF export
  • Zip code climate lookup
  • AR photo measurement
  • Manual S equipment sizing
  • Manual D duct sizing
  • Light commercial
  • Team seats
Most popular
Pro
$49
per month, billed monthly
  • Unlimited projects
  • Residential + light commercial
  • Full Manual J, S, D engines
  • Branded PDF reports
  • Manual S equipment sizing
  • Manual D duct sizing
  • VRF and heat pump tools
  • AR photo measurement
  • Priority email support
  • Team seats

No credit card required for trial

Team
$149
per month, up to 5 users
  • Everything in Pro
  • 5 user seats
  • Company branding on all reports
  • Shared project library
  • Admin controls
  • Priority phone + email support
  • Onboarding call included
  • API access (add-on)
Need API access or enterprise pricing?

For large contractor networks, HVAC software integrations, or white-label deployments.

Navigation
Account
Welcome back
Free plan
Free plan - You have 1 free calculation. Upgrade to Pro for unlimited projects.
FREE
Total projects
1
This month
1
Avg. cooling load
51k BTUH
PDFs exported
0
Recent projects
Project nameTypeCoolingHeatingSizeStatus
New calculation
Start a new Manual J project
🏠
Residential
Single-family, multifamily, townhomes. ASHRAE 62.2 ventilation.
PRO
🏢
Light commercial
Office, retail, restaurant. ASHRAE 62.1, VAV/VRF.
My account
Manage your profile and subscription
Profile
JD
John Doe
john@example.com
Subscription
Free plan
1 free calculation included
FREE
New calculation
Steps
Output
Step 1 of 8
Project setup
Enter job site details. Climate data loads from zip code automatically.
01
Job site
Start typing — climate data loads automatically
02
Building basics
Step 1 of 8
Step 2 of 8
Design conditions
ASHRAE outdoor design temperatures - auto-loaded from zip code.
DC
Outdoor design temperatures
Location
Enter zip code above
Zone
—
Elevation
—
IN
Indoor design conditions
Step 2 of 8
Step 3 of 8
Building envelope
Walls, roof, and floor assemblies.
W
Exterior walls
R
Roof / ceiling
F
Floor / foundation
Step 3 of 8
Step 4 of 8
Windows and doors
Enter window area by orientation and glazing specs.
GL
Glazing specs
OR
Window area by orientation (ft2)
Step 4 of 8
Step 5 of 8
Infiltration and ventilation
Air leakage is often the largest single load.
AF
Air leakage
ACHnat = ACH50 / 17
OA
Ventilation (ASHRAE 62.2)
Step 5 of 8
Step 6 of 8
Internal gains
Occupants, lighting, and appliances increase cooling load.
IG
Occupancy and equipment
230 BTU/hr sensible per person
Step 6 of 8
Step 7 of 8
Duct system
Ducts in unconditioned spaces add 10-30% to equipment load.
DU
Duct location and insulation
Step 7 of 8
Step 8 of 8
Room-by-room zones
Optional - needed for duct sizing (Manual D) and zoning.
RM
Zone list
RoomArea ft2BTUHCFM
Living room3807,600352
Master bedroom2805,200241
Kitchen / dining3209,800454
Step 8 of 8
Calculation complete
Load calculation results
Full Manual J output - review and export your permit-ready report.
SU
Summary
Total cooling load
-
BTUH sensible + latent
Total heating load
-
BTUH at design conditions
Recommended size
-
Manual S sizing
Complete
Live results
Sensible cooling
-
BTUH
Latent cooling
-
BTUH
Total cooling
-
BTUH
Envelope-
Solar gain-
Infiltration-
Internal-
Duct loss-
Heating load
-
BTUH
SHR
-
humiddry
Manual S
-
Complete inputs to get sizing
J
You have used your free calculation

Upgrade to Pro to run unlimited calculations, export branded PDFs, and access equipment sizing and duct design tools.

Pro
$49/mo
Unlimited, all features
Team
$149/mo
5 seats, branded reports
Back to dashboard
AR Ruler AI extraction
Analyzing photo...
Extracted measurement
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