HVAC Toolkit vs Outkeepr
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HVAC Toolkit
This comprehensive toolkit offers essential HVAC calculations and tools for professionals. It combines multiple specialized applications into a single, convenient package for iPhone and iPad users.
- Equipment tracking and customization
- Refrigerant pressure-temperature charts
- Refrigerant charge calculations
- Duct sizing
- Cooling and heating load calculations
- Psychrometric calculations
- Steam tables
- Pipe sizing for liquid, steam, and gas
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The HVAC Toolkit app for the iPhone and iPad is the essential app for anyone in the HVAC industry. It includes a combination of many of our stand-alone iOS applications. Individually, the apps cost a total of $70. By purchasing the Toolkit, you pay only $24: 1. HVAC Equipment Locator 2. HVAC PT Chart 3. HVAC Refrigerant Charge 4. HVAC Duct Sizer 5. HVAC Quick Load 6. Psychrometrics 7. Steam Tables 8. Pipe Sizer - Liquid 9. Pipe Sizer - Steam 10. Pipe Sizer - Gas High 11. Pipe Sizer - Gas Low This is a universal app that works on both the iPhone and iPad. The "HVAC Equipment Locator" module allows you to track, share, and customize your equipment nameplate and maintenance data. The version here includes the ability to customize your input screens. The "HVAC PT Chart" module allows you to easily view the pressure-temperature properties of 75 refrigerants. Think of this app as a digital version of the paper PT charts that you may have carried around with you in the past. The "HVAC Refrigerant Charge" module allows you to perform superheat and subcool refrigerant charge calculations on-the-fly. This app includes pressure-temperature data for over 75 common refrigerants. The "HVAC Duct Sizer" module allows you to quickly size one HVAC duct run and a range of duct sizes. You can specify the total airflow in CFM (or L/s), the aspect ratio and one of either the velocity of air or the friction loss per 100 feet (30 meters). The "HVAC Quick Load" module allows you to perform quick and simple HVAC cooling and heating load calculation analysis. You can specify the building type, total area, and # of people. The results include the total cooling and heating loads and airflows. The "Psychrometrics" module allows you to easily perform single-state and mixed-air HVAC psychrometric calculations for a wide range of barometric air pressures. The "Steam Tables" module allows you to calculate the properties of saturated or superheated steam by specifying 2 input properties. The "HVAC Pipe Sizer - Liquid" module allows you to size a pipe run with many different types of liquids (or fluids), pipe material and fitting types. The "HVAC Pipe Sizer - Steam" module allows you to size a steam pipe run, and it also includes a bonus steam table calculator. The "HVAC Pipe Sizer - Gas High/Low" module allows you to quickly size a simple low (less than or equal to 1.5 psi) and high (greater than 1.5 psi) pressure gas piping system by inputting a number of piping and gas properties. This application includes all of the great features of the individual HVAC iOS applications such as the use of slider controls that allow you to quickly increment or decrement the input values and immediately observe the calculated results. It also allows you to specify different types of liquids, gases, pipe material types, fitting quantities, min and max ranges, and step values. All of the above modules display units in English or Metric. Also, all of the above modules allow you to send emails with inputs and results. The "HVAC Toolkit" application was designed by Carmel Software Corporation, a leader in HVAC design software since 1995. In fact, Autodesk (the makers of AutoCAD) acquired our load calculation software and incorporated it into their leading 3D modeling software called Revit. In addition, Carmel has developed customized apps for organizations such as ASHRAE, Mitsubishi Electric, and Pacific Gas and Electric, amongst others. We also offer all of the above modules as individual apps for the iPhone/iPad: 1. HVAC ResLoad-J 2. HVAC Psych HD 3. HVAC Duct Sizer 4. HVAC Pipe Sizers 5. Steam Tables 6. Psychrometric Plus 7. Psychrometric LT 8. HVAC Pipe Sizer Plus 9. HVAC Pipe Sizer Gas Plus 10. HVAC Quick Load 11. HVAC Load Plus 12. HVAC Residential Load Calcs 13. HVAC Toolkit Ultimate 14. HVAC ASHRAE 62.1 15. HVAC ResVent 62.2 16. HVAC ASHRAE DFDB 17. HVAC ASHRAE Psych Chart
Outkeepr
Automate your vacation rental business with an AI co-host. Manage guest communication, cleaner scheduling, smart locks, and property performance from a single platform.
- AI-powered guest messaging
- Automated cleaner scheduling and payments
- Smart lock and climate automation
- Real-time arrival and activity alerts
- Unified inbox with conversation intelligence
- Property performance dashboard
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OutKeepr is the AI-powered operating system for vacation rental hosts who want to save time, eliminate chaos, and deliver consistently five-star stays—without burning out. Built for modern hosts and property managers, OutKeepr combines automation, intelligence, and real-time insights to run your business for you—like a professional co-host that never sleeps. Key Features • AI-Powered Guest Messaging Your always-on co-host handles common guest questions, check-in details, house rules, and issue triage—instantly and naturally—across all platforms. • Automated Cleaner Scheduling & Payments Schedule cleanings automatically, track completion in real time, and pay your team instantly when the job is done. • Smart Lock & Climate Automation Automatically generate and revoke door codes, and manage heating and cooling based on check-in and checkout—no manual work required. • Real-Time Arrival & Activity Alerts Get notified when guests arrive, cleaners start, or doors are accessed—so you’re always in the loop without hovering. • Unified Inbox & Conversation Intelligence One centralized inbox for every guest conversation, enhanced with AI suggested replies, and sentiment tracking. • Property-Level Performance Dashboard Instantly see which properties are clean, occupied, underperforming, or generating the most revenue—all in one view.
Screenshots
Verdict
The clearest difference is price: Outkeepr at Free against HVAC Toolkit's $23.99. Outkeepr also leads on review sentiment (100% vs 73%) and update cadence (every 2 months vs every 6 months). HVAC Toolkit's advantage is iOS requirement (13.0 vs 15.1). On rating, ratings volume, 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
Outkeepr is free to download; HVAC Toolkit costs $23.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for HVAC Toolkit against 5.0 for Outkeepr. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews are what separate them: 73% of HVAC Toolkit's written reviews are positive against 100% of Outkeepr's.
HVAC Toolkit ships an update every 6 months, Outkeepr every 2 months. The most recent releases landed on September 14, 2026 and September 21, 2026 respectively.
| Parameter | HVAC Toolkit | Outkeepr |
|---|---|---|
| Price | $23.99 | Free — better |
| Rating | 5.0 (2 ratings) | 5.0 (2 ratings) |
| Positive reviews | 73.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 2 | 2 |
| Update frequency | Every 6 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 50 MB | 62 MB |
| Age rating | 4+ | 4+ |
| Developer | Carmel Software Corporation | Fitzgerald Technologies LLC |
Customer experience
HVAC Toolkit
Outkeepr
In-app purchases
HVAC Toolkit
No in-app purchases
Outkeepr
No in-app purchases









