HVAC Calculator: BTU & AC Load
HVAC Calculator is a utility app for HVAC technicians and DIY homeowners that provides BTU, cooling load, and duct sizing tools on iOS.
The App DNA
What makes this app unique?
It removes the friction of carrying bulky physical charts and slide rules by providing instant, offline-capable calculations directly on the job site.
For HVAC technicians, installers, and DIY homeowners requiring field-ready sizing tools.
What does it look like?
Key features
Calculates BTU, cooling load, and exhaust fan airflow based on room dimensions, sun exposure, and occupancy.
Sizes round and rectangular ducts using the equal-friction method and ASHRAE Fundamentals friction correlation.
Performs all calculations without internet connectivity, designed for use on job sites.
How much does it cost?
Freemium model uses ad-supported free tier to drive adoption, with a one-time Pro purchase to remove ads.
Velocity
Maintenance developmentnew contentUX improvementsShow more...
With only one release in the observed window and 57 days since the last update, the app operates on a maintenance cadence. Development is currently focused on expanding core utility features rather than frequent iteration. The latest release added specific tools for duct sizing and cooling load estimation, marking a clear focus on functional expansion. Future updates are expected to remain infrequent based on the current development pace.
Who built it?
Vyacheslav Dovner
2 apps tracked · Utilities
YouClicker for YouTube srtUser Sentiment
What do users think recently?
How are ratings & reviews evolving?
Not enough recent reviews to extract reliable themes yet.
Read the full review analysisCompetition
Competitive landscape for HVAC Calculator: BTU & AC Load
How's the Utilities market?
HVAC Calculator occupies a specialized niche in the Utilities category, focusing on offline-first field utility rather than broad-market consumer tools. The app's reliance on a one-time purchase model suggests a focus on professional ownership rather than recurring subscription revenue.
Read the market outlookThe rivals identified
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Access the full report for freeThe Analyst's Read
Key takeaways for HVAC Calculator: BTU & AC Load
Where is it heading?
The HVAC utility market is shifting toward integrated field-service management, where sizing tools are expected to sync directly with client quotes and inventory. HVAC Calculator remains exposed: without a path to integrate with broader job-site workflows, the app risks becoming a secondary utility rather than a central hub for the technician's daily workflow.
- The latest release introduced a unified dashboard, showing active investment in improving the core technician workflow.
- The two-month update cadence indicates a stable maintenance posture rather than rapid feature expansion.
The SWOT
- Offline-first architecture ensures utility in remote field environments.
- ASHRAE-based formulas establish category authority for professional users.
- Automated PDF report generation for professional client documentation.
- Localized pricing in international markets where HVAC standards align.
Next best moves
Ship automated PDF report generation because professional installers require documentation for client quotes → increase Pro tier conversion.
+ 1 more prioritized moveThe counter-intuitive read
Offline-first design is a retention lever in low-connectivity…
Read the full takeBottom line
Automated reporting would unlock professional-grade utility for HVAC Calculator, shifting the app from a simple calculator to a documentation tool that justifies the Pro purchase price.
Unlock 2 critical frictions, 2 market threats, 1 more prioritized move and the analyst’s take.
Access the full report for freeFAQ
Is HVAC Calculator suitable for professional HVAC technicians?
Does HVAC Calculator require an internet connection to work?
What is the difference between the free and Pro versions?
Are there alternatives for HVAC load calculations?
Sources
- [1] App Store
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