# HVAC Filter Delivery: AI Shortlist Index, September 2026

> The September 2026 record of HVAC Filter Delivery in the AI Shortlist Index: every vendor as measured that edition, with the editorial read. This page does

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Last verified: 2026-09-03

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AI Shortlist Index · September 2026 snapshot · preview · Prompt Set v1.0

# HVAC Filter Delivery: AI Shortlist Index, September 2026

The hvac filter delivery ranking as the September 2026 edition measured it: 25 runs across 25 prompts. The [live category page](/ai-shortlist-index/hvac-filter-delivery/) carries the current edition; this one does not change.

## Editorial read

Twenty-five prompts, one run each, captured from the ChatGPT app in early October 2026. Second Nature was named in 95% of runs and FilterTime in 86%; no one else passed 32%, and only 7 vendors were named at all. For practical purposes this is a two-vendor category in the engine's view. One run per prompt; read it as a first reading.

## Ranking

HVAC Filter Delivery, September 2026 snapshot. 25 runs from 1 engine. Mention rate = share of runs that named the vendor. Green means named.
| # | Vendor | Mention rate | Engines | Consistency | Move | Trend |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | [Second Nature](/ai-shortlist-index/hvac-filter-delivery/second-nature/) | 95% | 1/1 | – | – | – |
| 2 | [FilterTime](/ai-shortlist-index/hvac-filter-delivery/filtertime/) | 86% | 1/1 | – | – | – |
| 3 | [Filterbuy](/ai-shortlist-index/hvac-filter-delivery/filterbuy/) | 32% | 1/1 | – | – | – |
| 4 | [Latchel](/ai-shortlist-index/hvac-filter-delivery/latchel/) | 8% | 1/1 | – | – | – |
| 5 | [Filters Direct USA](/ai-shortlist-index/hvac-filter-delivery/filters-direct-usa/) | 4% | 1/1 | – | – | – |
| 6 | [RIS](/ai-shortlist-index/hvac-filter-delivery/ris/) | 4% | 1/1 | – | – | – |
| 7 | [CredHub](/ai-shortlist-index/hvac-filter-delivery/credhub/) | 4% | 1/1 | – | – | – |
| – | [Beagle](/ai-shortlist-index/hvac-filter-delivery/beagle/) | 0% | 0/1 | – | – | – |
| – | [Homestock USA](/ai-shortlist-index/hvac-filter-delivery/homestock-usa/) | 0% | 0/1 | – | – | – |

## Engines

Engines in this edition. Mention rates are averaged over the engines shown.
| Engine | Status | Model | Runs | Note |
| --- | --- | --- | --- | --- |
| ChatGPT | ran | gpt-5-6-thinking | 25 |  |

Part of [the September 2026 edition](/ai-shortlist-index/2026-09/) of [the AI Shortlist Index](/ai-shortlist-index/). All editions: [archive](/ai-shortlist-index/archive/).

Last verified 2026-09-03