FieldCalc HVAC is a professional utility app for HVAC technicians that provides offline PT lookups, duct sizing, and load estimation on iOS.
The App DNA
What makes this app unique?
The app removes the connectivity friction technicians face in mechanical rooms and rooftops, serving as a reliable, standards-compliant alternative to online-only calculation tools.
For HVAC technicians and field professionals requiring offline, standards-compliant calculation tools for daily service and installation work.
What does it look like?
Key features
Pressure-temperature lookups for 13 refrigerants including R-454B and R-32 with real-time bubble/dew pressure glide display
Full suite of HVAC calculators including superheat, subcooling, and psychrometrics that function without internet connectivity
Generates exportable PDF reports for job documentation and client communication
How much does it cost?
The one-time $9.99 payment gates professional-grade tools and full refrigerant libraries, avoiding recurring subscription friction.
Velocity
Maintenance developmentnew contentUX improvementsShow more...
The app maintains a maintenance-tier cadence, with only one release recorded in the analyzed window. The latest release focuses on utility expansion, including refrigerant support and diagnostic tools, rather than recurring live operations. Development appears stable but infrequent, with 67 days elapsed since the last update. The publisher provides clear, feature-rich release notes rather than opaque documentation.
Who built it?
User 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 - FieldCalc
How's the Utilities market?
FieldCalc HVAC targets the professional utilities segment with a one-time purchase model, positioning itself against subscription-heavy industry incumbents.
Read the market outlookThe rivals identified
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Access the full report for freeThe Analyst's Read
Key takeaways for HVAC Calculator - FieldCalc
Where is it heading?
Users report: The HVAC utility market is shifting toward A2L-compliant tools as regulatory phase-outs of R-410A accelerate. FieldCalc HVAC is well-positioned to capture this demand by providing the necessary PT data in an offline-first format, which remains a critical requirement for field work.
- The addition of R-454B support aligns the app with industry-wide refrigerant phase-outs, ensuring long-term utility for field technicians.
The SWOT
- Offline-first architecture eliminates connectivity dependency in remote mechanical rooms
- Standards-compliant Manual J/D methodology provides professional-grade utility for daily installation work
- Expansion into localized PT charts for international markets where R-454B adoption is accelerating
Next best moves
Expand free-tier refrigerant library because limited access restricts adoption among technicians servicing legacy systems → increase top-of-funnel conversion
The counter-intuitive read
The one-time purchase model is a competitive advantage in the HVAC utility space…
Read the full takeBottom line
FieldCalc HVAC secures its position by prioritizing offline reliability for the A2L refrigerant transition, but expanding the free-tier library would unlock a larger segment of technicians still servicing legacy systems.
Unlock 1 critical friction, 1 market threat and the analyst’s take.
Access the full report for freeFAQ
Is FieldCalc HVAC suitable for professional HVAC technicians?
Does FieldCalc HVAC require an internet connection?
What is the difference between the free and Pro versions?
Sources
- [1] App Store, source
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