Comparison

IN HVAC Calculator vs Generator Code Vault

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

Head to head
About

IN HVAC Calculator

This app provides HVAC inspection tools and guidelines for home inspectors. It helps estimate equipment age, size, and requirements, giving inspectors confidence in their reports.

Highlights
  • Equipment circuit requirements calculator
  • AC tonnage estimation by model number
  • HVAC manufacture date lookup
  • Combustion air requirements guide
  • General HVAC reference information
Features
Read full description

Inspector Nation presents a general reference application to provide insight into the world of HVAC equipment inspection. It is never good practice to mention the exact age or tonnage rating in the home inspection report, but having a reference point of age and size gives the home inspector confidence to map out the inspection and set the tone for the report. This application will aid the inspector by providing several HVAC-related inspection calculators as well as guidelines for approximate values for (1) equipment circuit requirements, (2) air conditioner tonnage based on the model number, (3) HVAC manufacture date, and (4) combustion air requirements. Contact us if you'd like to request a feature for a future release!

About

Generator Code Vault

Features
Read full description

The fault-code answer in seconds - even with no signal in the generator room. Generator Code Vault puts 3,743 diesel generator fault codes from 38 brands in your pocket. Every code comes with the plain-language cause and the fix, so you can go from alarm to answer right at the panel. No account. No sign-in. Download it and get to work - your subscription is handled entirely by the App Store. WHAT YOU GET - 3,743 fault codes across 38 brands, searchable by code, brand or symptom - Plain-language causes and step-by-step fixes for every code - 55 guided sensor test procedures - test it before you replace it - 14 controller operating guides: read alarms, clear the fault log, reach service menus - J1939 SPN/FMI quick-decoder - Power, fuel and A/C sizing calculators built for gensets - Separate A/C and heat pump fault-code library - Works fully offline - no signal needed on site - Share any code, test or calculation as a clean card by text or email - Community forum - ask other techs and the gEncompass team, get an email when someone answers BUILT FOR REAL JOB SITES No signal in the generator room? No problem. Everything works offline. Search by the number on the controller, by brand, or just describe the symptom. PRO PLAN The Pro plan adds the AI assistant and the Job Builder: drag equipment onto a canvas, pull feeders, and it sizes breakers, wire and cable - then produces single-line diagrams and material order sheets so quotes go out the same day. Job Builder runs on your Mac or PC through a secure emailed link - no download, no password. PRICING 7-day free trial - full app, nothing to set up. Then Basic $4.99/month (all codes, sensor tests, guides and calculators) or Pro $7.99/month (everything plus AI assistant and Job Builder). Subscriptions auto-renew monthly and can be cancelled anytime in your App Store settings. Generator Code Vault is a product of gEncompass LLC. Questions? support@gencompass.com Terms of Use: https://codevault.gencompass.com/terms.html Privacy Policy: https://codevault.gencompass.com/privacy-policy.html

Screenshots

IN HVAC Calculator4 screens
Generator Code Vault4 screens

Verdict

The call

The clearest difference is update cadence: Generator Code Vault at weekly against IN HVAC Calculator's every 6 months. IN HVAC Calculator's advantage is iOS requirement (12.0 vs 15.0). On price, ads, in-app purchases and device support 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

IN HVAC Calculator ships an update every 6 months, Generator Code Vault weekly. The most recent releases landed on September 22, 2026 and September 13, 2026 respectively.

Scorecard2 real differences · 7 level
IN HVAC Calculator versus Generator Code Vault: the parameters behind the verdict, then further details
ParameterIN HVAC CalculatorGenerator Code Vault
PriceFreeFree
Rating4.2 (11 ratings) — better—
Number of ratings11 — better—
Update frequencyEvery 6 monthsWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size27 MB13 MB
Age rating4+17+
DeveloperGregory EnterprisesgEncompass LLC

In-app purchases

None

IN HVAC Calculator

No in-app purchases

None

Generator Code Vault

No in-app purchases

Questions

Is IN HVAC Calculator free?
IN HVAC Calculator is free to download, with no in-app purchases.
Is Generator Code Vault free?
Generator Code Vault is free to download, with no in-app purchases.
Do IN HVAC Calculator or Generator Code Vault have ads?
Neither IN HVAC Calculator nor Generator Code Vault shows ads.
Which is updated more often, IN HVAC Calculator or Generator Code Vault?
IN HVAC Calculator ships an update every 6 months, and Generator Code Vault weekly. Most recently, IN HVAC Calculator was updated on September 22, 2026 and Generator Code Vault on September 13, 2026.

Other comparisons