# BTU Calculator: AC & HVAC — Room Size & Unit Sizing

> Room Size & Unit Sizing (iPhone/iPad app by Blas Prieto.)

- Source: https://appshunter.io/ios/app/btu-calculator-ac-and-hvac/id6759358896 (this page in markdown: same URL + `.md`)
- Developer: [Blas Prieto](https://appshunter.io/developer/1878084920)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 15.1 · 25 MB
- Languages: American English
- Released: 2026-02-23
- Data updated: 2026-07-29
- User reviews in markdown: https://appshunter.io/ios/app/btu-calculator-ac-and-hvac/id6759358896/reviews.md

## What is BTU Calculator?

Size your AC or heating unit correctly - no more overpaying or sweating.

Takes room dimensions, ceiling height, insulation, sun exposure, occupants, and kitchen to recommend the right BTU and tonnage.

KEY FEATURES:

* Adjusted BTU Recommendation - Base BTU adjusted for conditions
* Tonnage Rating - Unit size in tons for HVAC shopping
* Adjustment Breakdown - How each factor affects BTU needs
* Imperial & Metric - Feet or meters; BTU or watts
* Multiple Factors - Insulation, sun, occupants, kitchen

Free to download. No sign-up. No paywall. Works offline.

By Blas Apps - simple calculators that do one thing perfectly.


## Version history (last 5 releases)

### 1.0.7 — 2026-03-14

Improved App Store listing.

### 1.0.6 — 2026-03-05

Fixed interstitial ad loading. Improved stability and performance.

### 1.0.5 — 2026-03-04

Fixed a crash that could occur on app launch. Improved stability and performance.

### 1.0.4 — 2026-03-03

Fixed a crash that could occur on app launch. Improved stability.

### 1.0.3 — 2026-03-03

Bug fixes and performance improvements.

## More apps by Blas Prieto

- [Compound Calc: Savings](https://appshunter.io/ios/app/compound-calc-savings/id6759321374)
- [Auto Loan Calc: Car Payment](https://appshunter.io/ios/app/auto-loan-calc-car-payment/id6759358751)
- [Ovulation Calc & Fertile Days](https://appshunter.io/ios/app/ovulation-calc-and-fertile-days/id6759358803)
- [Mulch Calculator & Estimator](https://appshunter.io/ios/app/mulch-calculator-and-estimator/id6759358826)
- [Freelance Rate Calculator](https://appshunter.io/ios/app/freelance-rate-calculator/id6759358903)

All apps by Blas Prieto: https://appshunter.io/developer/1878084920

## Related topics

[btu calculator](https://appshunter.io/ios/topics/btu-calculator) · [btu ventilation](https://appshunter.io/ios/topics/btu-ventilation)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-29.*