Comparison

IN HVAC Calculator vs HVAC Decoder

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

HVAC Decoder

Decode HVAC model and serial numbers from major brands. This utility app provides thousands of model numbers and can email search results. It supports a wide range of HVAC equipment and offers close matches for unknown numbers.

Highlights
  • Decode HVAC model numbers
  • Decode HVAC serial numbers
  • Supports major HVAC brands
  • Thousands of model numbers
  • Email search results
  • Close match functionality
  • Report missing data
Features
Currently charting
Read full description

This app will decode the model number nomenclature of most HVAC companies. It has all the major brand names with many thousands of model numbers. It will also decode the serial number for many HVAC companies. It has the ability to email the search results in HTML format via an installed mail client. App is effective at decoding model and serial numbers for packaged units, air conditioners / condensing units, air handlers, evaporator coils, furnaces, heat pumps, boilers, chillers, split systems / mini splits, geothermal systems, and more.  If the model number is not found exactly it will try a close match. If there is no close match it will give you the option to report missing data. The data is constantly updated and purchase of the app gets you free updates forever.

Screenshots

IN HVAC Calculator4 screens
HVAC Decoder4 screens

Verdict

The call

The clearest difference is price: IN HVAC Calculator at Free against HVAC Decoder's $9.99. IN HVAC Calculator also leads on rating (4.2 vs 4.0) and iOS requirement (12.0 vs 14.0). HVAC Decoder's advantage is chart position (#200 vs unranked). On ratings volume, 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

IN HVAC Calculator is free to download; HVAC Decoder costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

IN HVAC Calculator holds the better App Store score, 4.2 against 4.0. Both are backed by a comparable volume of ratings — 11 and 28 respectively.

UpkeepUpdate frequency

IN HVAC Calculator ships an update every 6 months, HVAC Decoder every 3 months. The most recent releases landed on August 15, 2026 and September 21, 2026 respectively.

Scorecard5 real differences · 6 level
IN HVAC Calculator versus HVAC Decoder: the parameters behind the verdict, then further details
ParameterIN HVAC CalculatorHVAC Decoder
PriceFree — better$9.99
Rating4.2 (11 ratings) — better4.0 (28 ratings)
Positive reviews—68.8% of reviews
Number of ratings1128 — better
Update frequencyEvery 6 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
Best chart rank—#200 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better14.0
Further details — not scored
Size27 MB6 MB
Age rating4+4+
DeveloperGregory EnterprisesCharles Cope

Customer experience

IN HVAC Calculator

All ratings11 ratings
Positive81.8%
Neutral0.0%
Negative18.2%

HVAC Decoder

All ratings28 ratings
Positive71.4%
Neutral10.7%
Negative17.9%
Written reviews16 reviews
Positive68.8%
Neutral18.8%
Negative12.5%

In-app purchases

None

IN HVAC Calculator

No in-app purchases

None

HVAC Decoder

No in-app purchases

Questions

Is IN HVAC Calculator free?
IN HVAC Calculator is free to download, with no in-app purchases.
Is HVAC Decoder free?
HVAC Decoder costs $9.99, with no in-app purchases.
Which has better reviews, IN HVAC Calculator or HVAC Decoder?
IN HVAC Calculator is rated higher. IN HVAC Calculator averages 4.2 out of 5 from 11 ratings, while HVAC Decoder averages 4.0 from 28 ratings.
Do IN HVAC Calculator or HVAC Decoder have ads?
Neither IN HVAC Calculator nor HVAC Decoder shows ads.
Which is updated more often, IN HVAC Calculator or HVAC Decoder?
IN HVAC Calculator ships an update every 6 months, and HVAC Decoder every 3 months. Most recently, IN HVAC Calculator was updated on August 15, 2026 and HVAC Decoder on September 21, 2026.

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