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 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
| # | Vendor | Mention rate | Engines | Consistency | Move | Trend |
|---|---|---|---|---|---|---|
| 1 | Second Nature | 95% | 1/1 | – | – | – |
| 2 | FilterTime | 86% | 1/1 | – | – | – |
| 3 | Filterbuy | 32% | 1/1 | – | – | – |
| 4 | Latchel | 8% | 1/1 | – | – | – |
| 5 | Filters Direct USA | 4% | 1/1 | – | – | – |
| 6 | RIS | 4% | 1/1 | – | – | – |
| 7 | CredHub | 4% | 1/1 | – | – | – |
| – | Beagle | 0% | 0/1 | – | – | – |
| – | Homestock USA | 0% | 0/1 | – | – | – |
Engines
| Engine | Status | Model | Runs | Note |
|---|---|---|---|---|
| ChatGPT | ran | gpt-5-6-thinking | 25 |
Part of the September 2026 edition of the AI Shortlist Index. All editions: archive.