IN HVAC Calculator vs HVAC Decoder
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Equipment circuit requirements calculator
- AC tonnage estimation by model number
- HVAC manufacture date lookup
- Combustion air requirements guide
- General HVAC reference information
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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!
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.
- 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
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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
Verdict
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
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.
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.
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.
| Parameter | IN HVAC Calculator | HVAC Decoder |
|---|---|---|
| Price | Free — better | $9.99 |
| Rating | 4.2 (11 ratings) — better | 4.0 (28 ratings) |
| Positive reviews | — | 68.8% of reviews |
| Number of ratings | 11 | 28 — better |
| Update frequency | Every 6 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Best chart rank | — | #200 — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 27 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Gregory Enterprises | Charles Cope |
Customer experience
IN HVAC Calculator
HVAC Decoder
In-app purchases
IN HVAC Calculator
No in-app purchases
HVAC Decoder
No in-app purchases
Questions
Is IN HVAC Calculator free?
Is HVAC Decoder free?
Which has better reviews, IN HVAC Calculator or HVAC Decoder?
Do IN HVAC Calculator or HVAC Decoder have ads?
Which is updated more often, IN HVAC Calculator or HVAC Decoder?
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