HVAC Load Calculator is a mobile utility for HVAC contractors that performs Manual J load calculations on iOS and Android.
Product velocity
Maintenance
Daily rank 🇺🇸
—
Utilities
Sentiment
4.7
25 reviews
Nemesis
Duct Calculator - DuctCalc
The App DNA
What makes this app unique?
Contractors hire this tool to generate professional load reports on-site without needing a desktop computer, removing the friction of post-visit data entry.
For HVAC contractors, installers, and sales teams who require accurate, field-accessible load calculations for residential projects.
Key features
Scalable input complexity (8, 15, or 16+ inputs) allowing users to choose between speed and precision.
Local execution of all Manual J calculations and climate data lookups without requiring connectivity.
Integrated camera tool to capture, tag, and append photos to project reports.
How much does it cost?
Low-cost annual subscription model designed to replace expensive legacy desktop software with a mobile-first, field-ready alternative.
Velocity
Maintenance developmentperformanceUX improvementsShow more...
The app exhibits a maintenance-level cadence, with only one release event recorded in the observed data. Development is currently focused on technical accuracy, specifically refining HVAC sizing calculations and climate data integration. There is no evidence of a high-frequency release cycle or live-ops engagement strategies. The current development trend is stable, prioritizing functional reliability over new feature expansion.
Who built it?
Mike Watson
2 apps tracked · Utilities
Leafed - Private Book TrackerUser Sentiment
What do users think recently?
Recent user voice shows an excited sentiment. Users appreciate modern, intuitive interface that simplifies complex manual j physics for field use.
How are ratings & reviews evolving?
What users say, by theme
- Modern, intuitive interface that simplifies complex Manual J physics for field use
Competition
Competitive landscape for HVAC Load Calculator Manual J
How's the Utilities market?
The app occupies the professional utility niche with a 4.68 rating across 25 reviews. Its focus on Manual J compliance differentiates it from general-purpose HVAC formula calculators.
Read the market outlookThe rivals identified
By Mikhail Nikitin
This app directly competes for the same field-based HVAC contractor audience by providing specialized technical calculations that mirror the utility of a Manual J load calculator.
- Includes specialized psychrometric analysis tools which are currently absent from our Manual J load calculator
- Offers a dual-function interface that handles both duct sizing and general HVAC calculations simultaneously
- Maintains a more frequent release cadence, signaling active development and responsiveness to user feedback
Unlock the head-to-head verdict: where this rival wins, and where it loses.
Access the full report for freeThe Analyst's Read
Key takeaways for HVAC Load Calculator Manual J
Where is it heading?
The professional HVAC utility market is consolidating around mobile-first tools that replace legacy desktop software. HVAC Load Calculator is well-positioned, but it must expand its technical module library to remain competitive against all-in-one rivals.
- The app maintains a 4.68 rating, indicating high satisfaction with the current field-focused feature set among early adopters.
- The lack of psychrometric modules creates a persistent feature gap that allows competitors to capture more technical power users.
The SWOT
- Offline-first architecture enables field use in signal-dead zones
- Three-level input mode scales from quick quotes to professional MJ8 compliance
- Integrate psychrometric analysis to neutralize nemesis
- Develop B2B bulk-licensing for HVAC franchise networks
Next best moves
Ship psychrometric analysis module because it is the primary feature gap against DuctCalc → neutralize nemesis advantage
The counter-intuitive read
The app's strength is not its Manual J compliance, but its offline-first architecture…
Read the full takeFeature gaps
Psychrometric analysis (available in Duct Calculator - DuctCalc but absent here)
Since the last report: The app resolved critical stability issues, leading to improved sentiment, and pivoted its development roadmap to address technical feature gaps against direct calculation-based competitors.
Bottom line
The app succeeds by prioritizing field-ready UX over desktop feature parity, but it must add psychrometric analysis to prevent user migration to comprehensive rivals, so the PM should prioritize technical module expansion over UI polish.
Unlock 2 critical frictions, 2 market threats and the analyst’s take.
Access the full report for freeReport last updated