HVAC Patents: Who Leads, Where the Gaps Are 2026
- No single filer dominates. the ranked leader holds 488 records and the top 10 combined account for just 13.9% of the 13,551 records in scope — this is a fragmented field, not a gated one.
- Filing has cooled from its peak. 2023 was the high point at 612 records, and 2021-to-2024 filings fell 20% (505 to 406) on the last complete years of data.
- Thermal claims sit inside surgical and imaging technology, not just building systems. the two largest IPC classes are A61B (diagnosis & surgery, 17.0% of records) and A61N (electrotherapy, 8.6%), ahead of H05B electric heating circuits at 5.4%.
Filing growth compares 2021 (505 records) with 2024 (406) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 13,551 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This landscape tracks 13,551 patent records published between 2015 and the 2026 data cut-off, searched against thermal Heating, HVAC thermal Heating and thermal Ventilation terms combined with core thermal-management concepts: temperature sensors, heat flux, thermal cycles, working fluid, heat transfer and refrigerant circuits. The scope is broader than conventional building HVAC — it pulls in any filing where thermal management concepts intersect with heating and ventilation language, which is why surgical and diagnostic thermal devices show up as heavily as building-system hardware.
Publication lags filing by roughly 18 months, so the most recent one or two years in any trend understate real filing activity. Treat 2024 as the last complete year and read 2025–2026 as still filling in.
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Filing trend and technology composition
Two views of the same 13,551 records: how filing volume has moved year over year, and which IPC subclasses carry the claim density.
A peak in 2023, then a pullback
Filings rose from 528 in 2017 to a peak of 612 in 2023. Across the last full three-year window, 2021 to 2024, volume fell 20% (505 to 406 records) — a genuine pullback on complete data, not an artifact of publication lag.
Thermal claims cluster in medical devices, not just buildings
A61B (diagnosis & surgery) covers 17.0% of the 13,551 records and A61N (electrotherapy & radiation therapy) covers 8.6% — both ahead of H05B (electric heating & lighting circuits) at 5.4%. Because records can carry multiple IPC classes, these shares add up to more than 100% and should be read against the full record count, not against each other.
Shares are the percentage of the 13,551 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Heating, Ventilation & Air Conditioning Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about heating, ventilation & air conditioning patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records in the corpus
US11686626B2 — Apparatus, systems, and methods for non-invasive thermal interrogation
Non-invasive sensors placed on the surface of an object combine a heat flux sensor and a temperature sensor to infer internal temperature distribution and internal properties from surface thermal signals, without penetrating the object's volume.Filed by Thermasense Corp, published 2023-06-27.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6575969B1 | Cool-tip radiofrequency thermosurgery electrode system for tumor ablation | 2,220 |
| 2 | US6241723B1 | Electrosurgical system | 1,738 |
| 3 | US9782214B2 | Surgical instrument with sensor and powered control | 1,633 |
| 4 | US9788851B2 | Surgical instrument with tissue density sensing | 1,531 |
| 5 | EP1011494B1 | Electrothermal device for sealing and joining or cutting tissue | 1,241 |
| 6 | US4998933A | Thermal angioplasty catheter and method | 983 |
| 7 | US20090076409A1 | Methods and systems for thermally-induced renal neuromodulation | 963 |
| 8 | US10149712B2 | Layered ferromagnetic coated conductor thermal surgical tool | 874 |
| 9 | US20120161405A1 | System and apparatus for flowable deposition in semiconductor fabrication | 839 |
| 10 | US6391251B1 | Forming structures from CAD solid models | 833 |
Citation counts favour older records simply because they have had longer to accumulate citations inside this corpus — read them as a signal of influence, not of current technical importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three patterns stand out once volume, concentration and citation data are read together.
Fragmented, not gated
The ranked leader holds 488 records out of 13,551 in scope, and the top 10 combined reach only 13.9%. No single assignee has secured a blocking position across the field — this favours new entrants who pick a specific mechanism rather than trying to out-file an incumbent.
Volume peaked, then eased
Filings rose to a peak of 612 in 2023 before the 2021-to-2024 window showed a 20% decline (505 to 406). That is measured on complete years only — 2025 and 2026 are still filling in under normal publication lag and should not be read as continuing the same slope.
Medical thermal sensing outweighs building systems
A61B diagnosis-and-surgery classifications appear in 17.0% of the 13,551 records, more than double H05B electric heating circuits at 5.4%. Anyone scoping freedom-to-operate in conventional HVAC hardware needs to check adjacent medical-device claims, since the search terms pull genuinely overlapping thermal-sensing mechanisms.
Citation leaders are older surgical thermal patents
The most-cited record in the corpus, on cool-tip radiofrequency thermosurgery, carries 2,220 citations — a reminder that citation counts reward age and prior foundational claims, not current filing activity.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to heating, ventilation & air conditioning patent landscape, with the prior art for and against each one.
Who holds ground, and where momentum has stalled
The ranking spans 100 assignees counted by patent family; even the leader controls a small slice of total volume.
A large filer in a fragmented field
The top-ranked assignee holds 488 records — more than triple the tenth-place count of 105 — but still represents a small fraction of the 13,551 records in scope. Its position reflects sustained filing in ablation and thermal-therapy hardware rather than dominance of HVAC hardware broadly.
A tight band from fifth to tenth
Fifth place holds 155 records and tenth place holds 105 — a narrow spread that suggests the mid-field is contestable. A newcomer with a focused portfolio in a specific mechanism could realistically close that gap within a filing cycle or two.
Recent activity has thinned even among leaders
Several of the most active historical assignees show zero filings in the latest year, and the one still filing recorded only 2 records, down 83% year over year. Given publication lag, this partly reflects filings still working through the pipeline rather than a genuine stop in R&D.
| Assignee | Recent year | YoY |
|---|---|---|
| LUXWALL INC | 2 | -83% |
| Medtronic Ardian Luxembourg SARL | 0 | — |
| Canon Inc. | 0 | — |
| Seurat Technologies Inc. | 0 | — |
| Panasonic Holdings Corporation | 0 | — |
| Toshiba Corporation | 0 | — |
| Medtronic Inc. | 0 | — |
| BTL Healthcare Technologies a.s. | 0 | -100% |
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, portfolio strategy or scouting for licensing targets.
Run a freedom-to-operate check on core mechanisms
Given the overlap between building HVAC claims and medical thermal-sensing claims in A61B and A61N, a mechanism-level FTO search catches blocking claims that a keyword search on 'HVAC' alone would miss.
Explore this in EurekaTrack the mid-field assignees for acquisition or licensing signals
The tight spread between fifth and tenth place (155 to 105 records) makes this band worth monitoring for consolidation activity or licensing opportunities before a larger filer closes the gap.
Set up assignee monitoring in EurekaScope a claim in the under-claimed branches
Non-invasive calibration methods and refrigerant-circuit diagnostics show lower filing density than the core classes — worth a closer prior-art pull before committing claim language.
Draft claim scope in EurekaCommon questions on the HVAC patent landscape
The assignee ranking spans 100 companies counted by patent family, with the leader holding 488 records out of 13,551 in scope. The field is fragmented rather than gated: the top 10 assignees combined account for only 13.9% of all records, so no single company controls the space. Several of the most active historical filers have slowed sharply in the most recent year, though publication lag means some of that recent-year drop reflects filings still working through the pipeline rather than an actual stop in R&D.
On the last complete years of data, filing activity has eased: 2021 to 2024 saw a 20% decline, from 505 to 406 records, after a peak of 612 records in 2023. The 2025 and 2026 figures in the trend are understated because publication typically lags actual filing by around 18 months, so they should not be read as continuing the same downward slope. The honest read is that the field passed a filing peak in 2023 and has since cooled, pending confirmation once later years finish publishing.
The search scope combines thermal Heating, HVAC thermal Heating and thermal Ventilation terms with core thermal-management concepts including temperature sensors, heat flux, thermal cycles, working fluid, heat transfer and refrigerant circuits. This pulls in more than conventional building HVAC hardware — the two largest IPC classes are A61B (diagnosis & surgery, 17.0% of records) and A61N (electrotherapy, 8.6%), both ahead of H05B electric heating circuits at 5.4%. Anyone scoping a building-systems portfolio should expect adjacent medical thermal-sensing filings to surface in the same search.
The under-claimed branches sit adjacent to the dense classes rather than far from them: non-invasive heat-flux calibration methods, refrigerant-circuit fault diagnostics, working-fluid selection for low-GWP cycles, and adaptive thermal-cycle control algorithms all show lower filing density than the core A61B and H05B classes. High density in those core classes means claim space there is occupied, not that the underlying technology is mature — the openings are in the specific mechanisms, not the broad category. A focused first claim on one of these narrower mechanisms is more defensible than a broad thermal-management claim.
The most-cited record in the corpus, a cool-tip radiofrequency thermosurgery electrode system, carries 2,220 citations, and the next several most-cited records are also older surgical or electrosurgical thermal devices. Citation counts inside any searched corpus favour older records simply because they have had more time to accumulate citations, so a high count signals historical influence rather than current technical relevance. New filers should treat these as foundational prior art to design around, not as evidence that the underlying mechanism is still the most active area of innovation.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.