HVAC Load Calculator Manual J
HVAC Load Calculator Manual J Summary
HVAC Load Calculator Manual J is a free, with in-app purchases Android app in Tools by Mike @ Product Party. Released in Apr 2026 (3 months ago). It has about 571+ installs Based on AppGoblin estimates, it reaches roughly 110 monthly active users and generates around $<10K monthly revenue (100% IAP / 0% ads). Store last updated Aug 2, 2026
Recent activity: 47 installs this week (203 over 4 weeks) showing exceptional growth View trends →
HVAC Load Calculator Manual J SDKs Summary
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App Description
Manual J load calculations for HVAC pros. Offline. PDF reports. Fast & accurate.
The Manual J HVAC Load Calculator built for professionals who work in the field — not in a conference room.
Stop paying $40+ for bloated desktop software ported to mobile. This app was designed from scratch for HVAC contractors, technicians, and engineers who need accurate residential load calculations fast, whether you're in a basement with no signal or back at the truck writing up the job.
THREE LEVELS OF ACCURACY
Simple Mode – 8 inputs
Regional benchmarks and square-footage multipliers. Get an estimate in under 60 seconds. Perfect for quick quotes and initial sales conversations.
Moderate Mode – 15 inputs
Component-level factors: insulation quality, window types, foundation type — with a conservative safety buffer. The sweet spot for standard replacement jobs.
Pro Mode (Manual J) – 16 inputs + pro overrides
Full MJ8 physics: altitude-adjusted density, solar load factors, CLTD daily-range lag, and separated duct analysis. Right-sizes equipment — often by 1+ ton. Best for new construction and high-performance builds.
WORKS WHERE YOU WORK
- Offline-first — no signal in the basement? No problem. Everything runs locally on your device.
- Auto-save — every calculation saves automatically. Never lose your work.
- Professional PDF reports — generate and share branded load reports directly from your phone.
- Site photo documentation — capture tagged photos by location and component, add notes, include a photo appendix in your reports.
- Metric support — toggle between Imperial and SI (kW, m², m³/h) throughout the app and PDF reports.
THE MATH YOU TRUST
Calculations follow ACCA Manual J 8th Edition methodology:
- Cooling BTU/hr (sensible and latent loads)
- Heating BTU/hr
- Recommended tonnage (rounded to 0.5 tons)
- Recommended furnace size (rounded to 5,000 BTU)
- Manual S equipment sizing guidance
- Kitchen/appliance heat gain per MJ8 Table 4
BUILT FOR HVAC PROFESSIONALS
- HVAC contractors, installers, and service techs
- Sales teams quoting new systems
- Independent contractors building their business
- Engineers sizing equipment for new construction
- International professionals working in metric
No account. No setup. Just open the app and get to work.
Try free for 7 days — then $4.99/year. Cancel anytime.