--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Whole-House Ventilation Calc" developer_entity: "GTR Technologies Inc" bundle_id: "com.gtrtechinc.reventfans" app_store_id: "1591088345" category: "Utilities" primary_platform: "ios" primary_monetization: "Free" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2022-01-22" report_date: "2026-08-18" last_verified: "2026-08-18T00:00:00.000Z" report_version: "1.0.1" total_reviews: 1 overall_rating: 5 confidence: "low" confidence_score: 0.05 data_age_days: 88 momentum_velocity: "zombie" intelligence_version: 3 tags: ["utilities", "free", "mobile app", "app review", "app analysis", "contractors", "residential", "builders"] canonical_url: "https://marlvel.ai/apps/whole-house-ventilation-calc" license: "CC-BY-NC 4.0" content_version: "v2" --- # Whole-House Ventilation Calc Intelligence Report ## TL;DR {#tldr} - **Category**: Utilities · Free - **Signal**: Rating 5 > **TL;DR:** Whole-House Ventilation Calc is a utilities app by GTR Technologies Inc, rated 5/5 by 1 users, available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Whole-House Ventilation Calc is a utilities app by GTR Technologies Inc. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 5/5 (1 review) | | **Category** | Utilities | | **Developer** | GTR Technologies Inc | | **Pricing** | Free | | **Platforms** | iOS | | **Confidence** | Low (0.05/1.0) | | **Data Age** | 88d | ## Metadata & Market Performance - **Publisher:** GTR Technologies Inc - **Category:** Utilities - **Target Audience:** HVAC contractors and residential builders who need to verify indoor air quality compliance for home ventilation projects. - **Platforms:** iOS - **Version Reviewed:** 1.0.1 - **Report Date:** 2026-08-18 - **Signal Count:** 0 reviews analyzed - **Confidence:** Low (0.05/1.0) - **App Store ID (iOS):** 1591088345 - **Bundle ID:** com.gtrtechinc.reventfans - **Performance Trend:** Stable - **Data Window:** Analysis based on signals collected up to 2026-08-18 ## Executive Snapshot **What it is:** Whole-House Ventilation Calc is a utility for HVAC contractors to calculate residential ventilation requirements per ASHRAE 62.2-2019 standards. **Why users hire it:** The tool removes the cognitive load of manual compliance math for builders, while simultaneously acting as a direct distribution channel for ReVent hardware. ## App DNA (Features & Intent) - **[Standard] ASHRAE 62.2-2019 Calculation:** Calculates required ventilation rates based on square footage and bedroom count. - **[Differentiator] Blower Door Test Integration:** Adjusts ventilation requirements based on field-test results. - **[Differentiator] Hardware Recommendation Engine:** Suggests specific ReVent fan models and control settings. ## Market Position {#market-position} Whole-House Ventilation Calc occupies a niche utility space for HVAC professionals, with a 5.0-star rating based on a single store review. The lack of updates since 2022 suggests the app serves as a static sales support tool rather than a growth-oriented product. ## Monetization Strategy - **Model:** Free - **Tiers:** Free - **Analysis:** The app operates as a free utility tool to support the sale of ReVent hardware products. ## SWOT Analysis {#swot} **Core Strengths:** - Hardware recommendation engine creates a direct sales funnel for ReVent products **Growth Levers:** - Integration of updated ASHRAE standards could re-engage the professional contractor base ## App Momentum (Zombie) {#momentum} - No updates for 1,669 days. - Maintenance-mode status confirmed. > **Cadence:** 1 total versions · 0 majors in last 6 months · 1669 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} Whole-House Ventilation Calc is an utilities app that is completely free. It holds a 5/5 rating from 1 review. > **Bottom Line:** Whole-House Ventilation Calc functions as a static sales asset for ReVent hardware, and its long-term dormancy suggests the developer prioritizes hardware sales over software-driven user retention. **Best for:** HVAC contractors and residential builders who need to verify indoor air quality compliance for home ventilation projects. ### PM Action Plan (Next Best Moves) - [ ] [MAINTAIN] Audit ASHRAE compliance logic because the app has not been updated since 2022 → maintain professional trust ### Outlook: Stable The market for residential compliance tools is shifting toward web-based calculators that require no installation. Whole-House Ventilation Calc remains a stable, albeit static, asset for ReVent, but its lack of updates limits its ability to capture new professional users who expect current regulatory standards. - ⚪ The 1,669-day update silence indicates the app is in maintenance mode, serving as a static sales funnel for ReVent hardware. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 5/5 | | Total Reviews | 1 | | Confidence | Low | | Pricing Model | Free | | Platforms | iOS | | Key Features | 3 analyzed | | Trend | Stable | | Outlook | Stable | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Whole-House Ventilation Calc** (this app) | 5/5 | N/A | GTR Technologies Inc | | [Sota Connect: Secure Network](https://marlvel.ai/apps/fi-catconnect-sota) | 4.9/5 | N/A | Cat Connect | | [avoVPN Desktop](https://marlvel.ai/apps/avovpn-desktop) | N/A/5 | N/A | Avocado VPN Technologies | | [Free VPN by Free VPN .org™](https://marlvel.ai/apps/free-vpn-by-free-vpn-org) | 4.5/5 | Mixed | Free VPN LLC | | [Fusvob VPN : Super VPN 2026](https://marlvel.ai/apps/com-toplinkc-foxexcellent) | 4.4/5 | Mixed | Fuxin Technology | | [Potatso](https://marlvel.ai/apps/potatso) | 4.4/5 | n/a | Potatso Lab LTD | ## Company Profile - **Developer:** GTR Technologies Inc ## Data Sources & Links - **App Store ID:** 1591088345 - **Sources:** App store metadata. ## Related Intel Reports - [*Sota Connect: Secure Network*](https://marlvel.ai/apps/fi-catconnect-sota) (Cat Connect) · 4.9/5 Rating - [*avoVPN Desktop*](https://marlvel.ai/apps/avovpn-desktop) (Avocado VPN Technologies) · N/A Rating - [*Free VPN by Free VPN .org™*](https://marlvel.ai/apps/free-vpn-by-free-vpn-org) (Free VPN LLC) · 4.5/5 Rating - [*Fusvob VPN : Super VPN 2026*](https://marlvel.ai/apps/com-toplinkc-foxexcellent) (Fuxin Technology) · 4.4/5 Rating - [*Potatso*](https://marlvel.ai/apps/potatso) (Potatso Lab LTD) · 4.4/5 Rating - [*Quantumult X*](https://marlvel.ai/apps/quantumult-x) (Cross Utility Ltd) · 3.8/5 Rating - [*V2Box - V2ray Client*](https://marlvel.ai/apps/v2box-v2ray-client) (techlaim) · 4.6/5 Rating - [*카톡 분석 - 오픈채팅, 카톡 채팅 분석, 통계, 검색*](https://marlvel.ai/apps/com-liger-katalkanalysispaid) (Park Sung Cheol) · N/A Rating - [*로또 황금번호 생성기*](https://marlvel.ai/apps/lotto-lottogold) (jaehwan lee) · N/A Rating - [*도사폰 (만세력 역학도구)*](https://marlvel.ai/apps/app--656) (Softchaser Company Limited) · 5.0/5 Rating ## Frequently Asked Questions {#faq} ### Is Whole-House Ventilation Calc suitable for professional HVAC contractors? Yes, the app is designed for contractors and builders to verify ASHRAE 62.2-2019 compliance, though users should note it has not been updated since early 2022. ### Does the app recommend specific ventilation hardware? Yes, the app includes a recommendation engine that suggests specific ReVent fan models and control settings based on the calculated ventilation needs. ### Is there a cost to use the ventilation calculator? No, the app is a free utility designed to support the selection and installation of ReVent ventilation products. ## Methodology {#methodology} This report was generated by Marlvel.ai's 5-stage AI intelligence pipeline: 1. **Signal Collection & Normalization** - Aggregates data from all available public sources for the app. Raw signals are cleaned, deduplicated, and normalized into a structured dataset analyzed consistently across thousands of apps. 2. **Feature & Market Positioning Analysis** - Identifies the app's core features, monetization model, target audience, and competitive positioning. Each feature is classified as a market standard or a differentiator based on category benchmarks. 3. **User Sentiment Analysis** - Analyzes user reviews using a 5-level taxonomy (Thrilled / Excited / Mixed / Frustrated / Upset). Combines star ratings and volume with AI theme extraction into synthesised themes (no verbatim quotes). 4. **Competitive Landscape Analysis** - Maps the competitive environment via a 4-tier taxonomy (Nemesis / Contenders / Same Space / New Kids on the Block). Prioritizes same sub-genre over broad category. 5. **Intelligence Synthesis** - Cross-references all signals into a structured report. Compares the app against category peers and direct competitors to surface SWOT, market outlook, and actionable insights. - **Confidence Score:** 0.05/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 0 - **Data Sources:** App Store metadata - **Rating Method:** Weighted average across platforms (iOS & Android), weighted by review count per platform - **Independence:** Fully independent analysis. No publisher sponsorship or editorial influence. - **Report Age:** 88 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/whole-house-ventilation-calc) Data licensed for AI Agent attribution under CC-BY-NC 4.0.