# Navisizer vs Peirce Phelps HVAC Pro+

The clearest difference is rating: Peirce Phelps HVAC Pro+ at 4.8 against Navisizer's 2.4. Peirce Phelps HVAC Pro+ also leads on update cadence (every 6 weeks vs every 4 months). Navisizer's advantage is monetization model (free vs ad-supported). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Peirce Phelps HVAC Pro+ holds the better App Store score, 4.8 against 2.4. Both are backed by a comparable volume of ratings — 26 and 54 respectively.

Navisizer ships an update every 4 months, Peirce Phelps HVAC Pro+ every 6 weeks. The most recent releases landed on November 2, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Navisizer | Peirce Phelps HVAC Pro+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.4 (26 ratings)](https://appshunter.io/ios/app/navisizer/id1327385997/reviews) | **[4.8 (54 ratings)](https://appshunter.io/ios/app/peirce-phelps-hvac-pro-plus/id1491350039/reviews)** |
| Number of ratings | 26 | **54** |
| Positive reviews | 12.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 6 weeks** |
| Monetization | **Free** | Ad-supported |
| Size | 21 MB | 165 MB |
| Requires iOS | 17.2 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Navien](https://appshunter.io/developer/1327385996) | [Watsco, Inc.](https://appshunter.io/developer/510378878) |

## What reviewers say

### Navisizer

[App page](https://appshunter.io/ios/app/navisizer/id1327385997)

This app helps size domestic hot water heating systems for residential and commercial use. It calculates operating costs, savings, and generates comprehensive job specifications for Navien NPE Series tankless water heaters.

**Highlights:** Residential system sizing, Operating cost and savings calculation, Commercial application sizing (ASHRAE Hunter Curve), Tankless and tankless with storage solutions, Comprehensive job specification output, Save, print, or email system specs

**Features:** macOS Compatibility

**In-app purchases:** none


### Peirce Phelps HVAC Pro+

[App page](https://appshunter.io/ios/app/peirce-phelps-hvac-pro-plus/id1491350039)

This app provides HVAC professionals with on-the-go access to product information, real-time availability, and pricing. It includes tools for finding AHRI matched systems, checking warranties, and locating parts, along with helpful calculators and a flashlight feature.

**Highlights:** Real-time product availability and pricing, AHRI matched system search, Warranty verification, Parts lookup and superseded parts, Document access (spec sheets, manuals), Location finder with directions, Duct calculator, QR code and UPC scanner

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Navisizer free?

Navisizer is free to download, with no in-app purchases.

### Is Peirce Phelps HVAC Pro+ free?

Peirce Phelps HVAC Pro+ is free to download, with no in-app purchases.

### Which has better reviews, Navisizer or Peirce Phelps HVAC Pro+?

Peirce Phelps HVAC Pro+ is rated higher. Navisizer averages 2.4 out of 5 from 26 ratings, while Peirce Phelps HVAC Pro+ averages 4.8 from 54 ratings.

### Do Navisizer or Peirce Phelps HVAC Pro+ have ads?

Neither Navisizer nor Peirce Phelps HVAC Pro+ shows ads.

### Which is updated more often, Navisizer or Peirce Phelps HVAC Pro+?

Navisizer ships an update every 4 months, and Peirce Phelps HVAC Pro+ every 6 weeks. Most recently, Navisizer was updated on November 2, 2026 and Peirce Phelps HVAC Pro+ on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*