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

Best HVAC Filter Delivery According to AI

A subscription that ships the right size air filter to each unit on a schedule, so residents change them and the HVAC system lasts. The manager sets the size and interval per unit, the service handles shipping, and the cost is often folded into a benefits package. Buyers want fewer HVAC service calls and proof that filters were delivered when a system fails.

Editorial read

By Ryan York · September 2026 edition · 25 runs · 25 prompts

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. Mention rate = share of runs that named the vendor, averaged over the 1 engine that answered this edition. Rank by mention rate. Consistency = share of prompt×engine cells where all runs agreed; shown as – with fewer than two runs. Movement vs the prior edition; – when there is none. Green means named.
#	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	–	–	–

Every vendor in the category database is listed, named or not. A vendor that is absent from every answer is still a row, because absence is the finding. Add or correct a vendor.

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

Source map, top 5

The five domains cited most often across 109 citations in this category. Full list: the source map.
#	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	–

See all twenty domains and URLs in the filter delivery programs source map.

Prompts this edition

Prompt Set v1.0, frozen for the edition. A vendor named in a prompt's own text is not credited for that prompt. The full set across categories: prompt library.

hfd-best-01What's the best air filter delivery service for a property management company with about 300 single-family rentals?
hfd-best-02Which companies ship HVAC filters straight to tenants on a schedule for property managers? Give me a shortlist.
hfd-best-03We manage 120 units in small apartment buildings with in-unit furnaces. Which filter delivery programs work for a portfolio our size?
hfd-best-04I'm on Buildium and want to add filter delivery without signing up for a whole resident benefits package. Which filter subscription services should I look at?
hfd-best-05Which air filter subscription vendors do property managers recommend when the goal is fewer HVAC service calls?
hfd-best-06I manage 900 doors and want filter delivery as a revenue line, not something buried in a package. Which providers bill the property manager so I can pass the cost through to residents?
hfd-best-07I run 2,000 single-family rentals on Propertyware across three states. Which filter delivery services can handle a portfolio that size?
hfd-alt-01What are the alternatives to Second Nature for air filter delivery to tenants? · seeded: second-nature (not credited)
hfd-alt-02We like Second Nature's filter delivery but don't want the full resident benefits package. Which companies sell filter delivery on its own to property managers? · seeded: second-nature (not credited)
hfd-alt-03What are the alternatives to FilterTime for a property manager who wants filters shipped to each rental on a schedule? · seeded: filtertime (not credited)
hfd-alt-04We use FilterTime and want to compare before we renew. What other filter delivery programs are built for property management companies? · seeded: filtertime (not credited)
hfd-alt-05Is there an alternative to Beagle for filter delivery that a small property manager can run without the rest of the benefits bundle? · seeded: beagle (not credited)
hfd-seg-01I manage 500 scattered single-family homes where the lease makes tenants responsible for filters. Which filter delivery program is built for SFR property managers?
hfd-seg-02I own 24 units in three small buildings with individual furnaces. Is a filter delivery subscription worth it at my size, and which services work with small landlords?
hfd-seg-03We operate 5,000 garden-style apartment units with in-unit air handlers and our own maintenance techs. Which filter delivery or filter supply programs do operators our size use?
hfd-seg-04Which filter delivery services work for student housing where every unit has its own HVAC and the whole property turns over in August?
hfd-int-01Which HVAC filter delivery services integrate with AppFolio so each unit's filter size stays in sync?
hfd-int-02Which air filter delivery programs integrate with Rentvine?
hfd-int-03Which filter subscription services work with Buildium so the charge can be billed to the tenant through the ledger?
hfd-prob-01Our tenants will not change air filters no matter what the lease says, and we keep paying for frozen coils. Which services deliver the right filter to the tenant's door so this stops?
hfd-prob-02We billed a tenant a $75 diagnostic call for a clogged filter and it turned into a fight. Which companies get filters changed on time so property managers don't have to police tenants?
hfd-prob-03Tenants keep buying the wrong size or putting the filter in backwards. Which filter programs send the exact size for each unit with instructions a resident can follow?
hfd-prob-04An owner is pushing back on our mandatory filter program and says tenants should buy their own. Which filter delivery providers give a property manager proof of delivery when an HVAC system fails?
hfd-cmp-01Second Nature vs FilterTime for air filter delivery: which should a property manager with 400 doors choose? · seeded: second-nature, filtertime (not credited)
hfd-cmp-02FilterTime vs Beagle for filter delivery at a 150-door portfolio: do I need a whole resident benefits package or just the filters? · seeded: filtertime, beagle (not credited)

Elsewhere in the Index

Part of the AI Shortlist Index. Method changes: Index changelog.

Ryan York
Founder, WebPossible

Not where you expected? 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.