Comparison

CoolCalc vs HVAC Tech Assistant

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

CoolCalc

This offline toolkit for service technicians provides essential HVAC calculations, job documentation, and professional PDF reporting. It supports A2L refrigerants and prioritizes user privacy with no account or cloud storage required.

Highlights
  • Offline HVAC calculations
  • PT Chart and Charge Check
  • Duct Sizing and Airflow Calcs
  • Capacitor and Refrigerant Log
  • Professional PDF report generation
  • A2L refrigerant support
  • Privacy-focused, no account needed
Features
Read full description

CoolCalc is the offline HVAC field toolkit built for service technicians — run the numbers, document the job, and hand your customer a professional PDF report, all without a signal. No account. No cloud. No subscription lock-in. Buy once, use it forever. 8 FIELD CALCULATORS • PT Chart — Instant pressure-temperature lookup, including A2L refrigerants • Charge Check — Superheat & subcooling with built-in Target Superheat estimation • Duct Sizer — Size round or rectangular ducts by airflow and velocity • Airflow Quick Calcs — CFM, BTU, Delta T, tons, kW, and ACH in one tap • Static Pressure — TESP diagnostics checklist • Capacitor Test — Verify run/start capacitors against rated values • Refrigerant Log — Track charge added and recovered per job • System Quick Score — Fast health snapshot of the whole system A2L READY • Built for the 2025 refrigerant transition — R-32, R-454B and more • Safety-class flags and leak-check reference so you stay compliant CALCULATE → DOCUMENT → REPORT (the loop other tools don't have) • Save any calculation straight into a job record • Attach photos with captions, customer info, and system details • Generate a clean, branded PDF report and share via email, AirDrop, or any app REFRIGERANT REFERENCE • Quick PT data for R-410A, R-22, R-134a, R-32, R-454B and more • Field-ready tables you can check in seconds PRIVACY FIRST • No account, no server uploads — your jobs, photos, and reports stay on device • Camera and Photos access requested only when you need it PRO UPGRADE — ONE-TIME OR SUBSCRIPTION • Unlimited jobs and PDF exports, more photos per job • Full refrigerant reference library • Lifetime option: pay once, keep it for good Built by HVAC techs, for HVAC techs. Fast, focused, and made for the field — from the rooftop to the crawlspace. Terms of Use (EULA): https://sites.google.com/view/terms-of-use-for-coolcalc Privacy Policy: https://sites.google.com/view/privacypolicyforcoolcalc

About

HVAC Tech Assistant

Features
Read full description

HVAC Equipment Lookup helps HVAC technicians identify equipment, find model information, locate replacement parts, view technical specifications, troubleshoot systems, and manage service history. Supports furnaces, air conditioners, heat pumps, package units, mini-splits, boilers, and more. Quickly identify HVAC equipment and access important information to help diagnose issues, locate parts, manage service records, and work more efficiently in the field. New users receive starter AI credits after creating an account. FEATURES • Equipment Lookup and Identification Search HVAC equipment by model number, manufacturer, and equipment details. • Nameplate Photo Scanning Capture equipment nameplates and extract available model and specification information. • Technical Specifications Access model information and technical details for supported equipment. • Parts Sourcing Find replacement-part information and possible sourcing options. • Diagnostic Assistance Use AI-powered tools for troubleshooting guidance and service research. • Customer Equipment History Track equipment information connected to customer records. • Service Record Management Organize service notes, equipment history, and maintenance information. • Fast Mobile Search Quickly search equipment and technical information while working in the field. • Field Service Productivity Tools Keep equipment, customer, and service information organized in one place. Deep Storm Alpha HVAC helps reduce time spent searching for equipment information and gives technicians faster access to service-related data. The app supports work involving furnaces, air conditioners, heat pumps, package units, mini-splits, wall heaters, and other HVAC equipment. PURCHASE OPTIONS Deep Storm Alpha HVAC offers the following options: • Starter AI credits for new users • 50 AI Credits as a one-time consumable purchase • Monthly Premium subscription • Yearly Premium subscription Monthly and Yearly Premium provide unlimited AI use and access to all premium features while the subscription remains active. The 50 AI Credits purchase is not a subscription. Credits are added to your account, never expire, and may be purchased multiple times. PREMIUM FEATURES • Unlimited AI diagnostics and assistance • Unlimited equipment identification tools • Full access to premium HVAC tools • Expanded service and workflow features • Ongoing feature improvements SUBSCRIPTION INFORMATION Monthly Premium and Yearly Premium are auto-renewing subscriptions. • Payment will be charged to your Apple ID account at confirmation of purchase • Subscriptions automatically renew unless canceled at least 24 hours before the end of the current billing period • Your account will be charged for renewal within 24 hours before the end of the current period • You can manage or cancel subscriptions in your App Store account settings after purchase DISCLAIMER Deep Storm Alpha HVAC is an informational tool intended to assist HVAC professionals with equipment identification, technical research, diagnostics, and service management. Users must independently verify all specifications, wiring diagrams, part numbers, safety procedures, refrigerant requirements, and service recommendations before performing any work. This app does not replace manufacturer documentation, equipment manuals, local codes, industry standards, licensing requirements, or professional judgment. All information is provided as an assistive resource. Users are responsible for actions taken based on information obtained through the app. Privacy Policy https://swlabsgroupllc.com/PrivacyPolicy Terms of Use https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

CoolCalc4 screens
HVAC Tech Assistant4 screens

Verdict

The call

The clearest difference is iOS requirement: CoolCalc at 16.0 against HVAC Tech Assistant's 26.2. On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. CoolCalc sells 3 in-app purchases, starting at $9.99 per month and HVAC Tech Assistant sells 3 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

CoolCalc ships an update monthly, HVAC Tech Assistant fortnightly. The most recent releases landed on October 15, 2026 and September 20, 2026 respectively.

Scorecard1 real difference · 8 level
CoolCalc versus HVAC Tech Assistant: the parameters behind the verdict, then further details
ParameterCoolCalcHVAC Tech Assistant
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyMonthlyFortnightly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhoneiPhone, iPad — better
Requires iOS16.0 — better26.2
Further details — not scored
Size29 MB13 MB
Age rating4+4+
Developer杰 陈Chris Johnston

In-app purchases

3 purchases

CoolCalc

Subscriptions2
  • CoolCalc Pro Monthly$9.991 Month
  • CoolCalc Pro Yearly3 Days trial$59.991 Year
One-time1
  • CoolCalc Pro Lifetime$99.99
3 purchases

HVAC Tech Assistant

Subscriptions2
  • Deep Storm Alpha HVAC Premium$5.991 Month
  • Premium Yearly$59.991 Year
One-time1
  • 50 AI Credits$4.99

Questions

Is CoolCalc free?
CoolCalc is free to download, with in-app purchases available.
Is HVAC Tech Assistant free?
HVAC Tech Assistant is free to download, with in-app purchases available.
Do CoolCalc or HVAC Tech Assistant have ads?
Neither CoolCalc nor HVAC Tech Assistant shows ads.
Which is updated more often, CoolCalc or HVAC Tech Assistant?
CoolCalc ships an update monthly, and HVAC Tech Assistant fortnightly. Most recently, CoolCalc was updated on October 15, 2026 and HVAC Tech Assistant on September 20, 2026.

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