# The Websites AI Cites When Recommending HVAC Filter Delivery > The twenty domains and URLs ChatGPT, Perplexity, Gemini and Google AI cited most when recommending hvac filter delivery, by type, September 2026. Disclosed Canonical: https://webpossible.com/ai-shortlist-index/hvac-filter-delivery/sources/ Source: https://webpossible.com/ai-shortlist-index/hvac-filter-delivery/sources/ Format: Markdown version for AI agents. The canonical HTML page is at the source URL above. Last verified: 2026-09-03 --- Source map · HVAC Filter Delivery · September 2026 # The Websites AI Cites When Recommending HVAC Filter Delivery Every URL the engines cited or consulted while answering this category’s prompts, counted. Where an engine discloses only the links in its answer, as the ChatGPT app does, those links are what is counted. This is the list a vendor has to appear on to be named. 109 citations across 25 runs. By type: vendor site 74 · other 14 · listicle 5. ## Top domains Top 20 domains by citation count, HVAC Filter Delivery, September 2026. Engines = which engines cited it; Supports = vendors whose own domain it is. | # | Domain | Type | Citations | Engines | Supports | | --- | --- | --- | --- | --- | --- | | 1 | secondnature.com | vendor site | 32 | ChatGPT | Second Nature | | 2 | pm.filtertime.com | vendor site | 22 | ChatGPT | FilterTime | | 3 | filtertime.com | vendor site | 9 | ChatGPT | FilterTime | | 4 | filterbuy.com | vendor site | 6 | ChatGPT | Filterbuy | | 5 | thisoldhouse.com | listicle | 3 | ChatGPT | – | | 6 | airestor.com | other | 2 | ChatGPT | – | | 7 | airfiltersdelivered.com | other | 2 | ChatGPT | – | | 8 | appfolio.com | other | 2 | ChatGPT | Second Nature | | 9 | joinbeagle.com | vendor site | 2 | ChatGPT | Beagle | | 10 | latchel.com | vendor site | 2 | ChatGPT | DOOR, Latchel | | 11 | rentvine.com | listicle | 2 | ChatGPT | FilterTime | | 12 | aerofilter.com | other | 1 | ChatGPT | – | | 13 | apex-ms.com | other | 1 | ChatGPT | – | | 14 | caliperair.com | other | 1 | ChatGPT | – | | 15 | credhub.com | vendor site | 1 | ChatGPT | CredHub | | 16 | developer.buildium.com | other | 1 | ChatGPT | – | | 17 | discountfilters.com | other | 1 | ChatGPT | – | | 18 | ferguson.com | other | 1 | ChatGPT | – | | 19 | filter-smart.us.com | other | 1 | ChatGPT | – | | 20 | filterful.com | other | 1 | ChatGPT | – | ## Top URLs Top 20 URLs by citation count, HVAC Filter Delivery, September 2026. Tracking parameters removed before counting. | # | URL | Type | Citations | Engines | Supports | | --- | --- | --- | --- | --- | --- | | 1 | [www.secondnature.com/benefits/air-filter-delivery](https://www.secondnature.com/benefits/air-filter-delivery) | vendor site | 20 | ChatGPT | Second Nature | | 2 | [www.filtertime.com/partner-programs/property-management](https://www.filtertime.com/partner-programs/property-management) | vendor site | 9 | ChatGPT | FilterTime | | 3 | [pm.filtertime.com/bhp/property-management](https://pm.filtertime.com/bhp/property-management) | vendor site | 6 | ChatGPT | FilterTime | | 4 | [pm.filtertime.com](https://pm.filtertime.com/) | vendor site | 5 | ChatGPT | FilterTime | | 5 | [www.secondnature.com/pricing](https://www.secondnature.com/pricing) | vendor site | 5 | ChatGPT | Second Nature | | 6 | [filterbuy.com/business/property-management](https://filterbuy.com/business/property-management/) | vendor site | 3 | ChatGPT | Filterbuy | | 7 | [pm.filtertime.com/filtertime-and-buildium-integration](https://pm.filtertime.com/filtertime-and-buildium-integration) | vendor site | 3 | ChatGPT | FilterTime | | 8 | [pm.filtertime.com/pricing](https://pm.filtertime.com/pricing) | vendor site | 3 | ChatGPT | FilterTime | | 9 | [www.thisoldhouse.com/heating-cooling/best-air-filter-subscription-services](https://www.thisoldhouse.com/heating-cooling/best-air-filter-subscription-services) | listicle | 3 | ChatGPT | – | | 10 | [airestor.com](https://airestor.com/) | other | 2 | ChatGPT | – | | 11 | [pm.filtertime.com/property-management](https://pm.filtertime.com/property-management) | vendor site | 2 | ChatGPT | FilterTime | | 12 | [www.airfiltersdelivered.com/pages/subscribe-save-air-filter-delivery](https://www.airfiltersdelivered.com/pages/subscribe-save-air-filter-delivery) | other | 2 | ChatGPT | – | | 13 | [www.appfolio.com/newsroom/appfolio-and-second-nature-announce-partnership](https://www.appfolio.com/newsroom/appfolio-and-second-nature-announce-partnership) | other | 2 | ChatGPT | Second Nature | | 14 | [www.joinbeagle.com/renters-kit](https://www.joinbeagle.com/renters-kit) | vendor site | 2 | ChatGPT | Beagle | | 15 | [www.secondnature.com/blog/reduce-hvac-maintenance-costs-data-study?hs\_amp=true](https://www.secondnature.com/blog/reduce-hvac-maintenance-costs-data-study?hs_amp=true) | vendor site | 2 | ChatGPT | Second Nature | | 16 | [aerofilter.com](https://aerofilter.com/) | other | 1 | ChatGPT | – | | 17 | [apex-ms.com/services](https://apex-ms.com/services/) | other | 1 | ChatGPT | – | | 18 | [caliperair.com/business](https://caliperair.com/business) | other | 1 | ChatGPT | – | | 19 | [credhub.com/renters-benefits-package](https://credhub.com/renters-benefits-package/) | vendor site | 1 | ChatGPT | CredHub | | 20 | [developer.buildium.com](https://developer.buildium.com/) | other | 1 | ChatGPT | – | ## What to do with this The AI Visibility Sprint is defined against this list: entry into five of the top ten cited sources in the category, plus the owned pages engines extract from. Start with the [filter delivery programs ranking](/ai-shortlist-index/hvac-filter-delivery/), read the [methodology](/ai-shortlist-index/methodology/) for how citations are captured, and compare with the other source maps: [RBPs](/ai-shortlist-index/resident-benefits-platforms/sources/), [access control](/ai-shortlist-index/multifamily-access-control/sources/), [maintenance software](/ai-shortlist-index/maintenance-vendor-network-software/sources/), [utility management](/ai-shortlist-index/utility-management/sources/), [parking management](/ai-shortlist-index/parking-management/sources/), [EV charging](/ai-shortlist-index/ev-charging-for-multifamily/sources/), [community engagement apps](/ai-shortlist-index/community-engagement-apps/sources/), [HOA management software](/ai-shortlist-index/hoa-management-software/sources/), [facilities management](/ai-shortlist-index/facilities-management-cre/sources/), [affordable housing compliance software](/ai-shortlist-index/affordable-housing-compliance/sources/), [package management](/ai-shortlist-index/package-management/sources/), [resident experience platforms](/ai-shortlist-index/resident-experience-and-amenities/sources/), [pest control programs](/ai-shortlist-index/pest-control-programs-for-property-managers/sources/), [renters insurance programs](/ai-shortlist-index/renters-insurance-programs/sources/), [tenant screening](/ai-shortlist-index/tenant-screening/sources/), [AI leasing assistants](/ai-shortlist-index/ai-leasing-assistants/sources/), [rent payment platforms](/ai-shortlist-index/rent-payments/sources/), [deposit alternatives](/ai-shortlist-index/security-deposit-alternatives/sources/) and [smart home platforms](/ai-shortlist-index/smart-home-for-multifamily/sources/). Part of [the AI Shortlist Index](/ai-shortlist-index/). Method: [how sources are recorded](/ai-shortlist-index/methodology/). RY Ryan York Founder, WebPossible ## Which of these sources are you missing from? Get your row explained — $3,500 Seven days. Twenty-five prompts in ChatGPT. The cause behind your row and a 90-day fix. Ryan replies with an agreement and an invoice; no call required. Leave this empty Name Work email Company domain Get an Audit Prefer a call? [Contact](/contact/). Goes to ryan@webpossible.com with this page’s URL attached. Never shared, never sold. See the [privacy policy](/privacy/). Last verified 2026-09-03