Heat Pump Patent Landscape 2026
Heat Pump Patent Landscape in 2026
The heat pump patent field is mature and concentrated, with Japanese and multinational HVAC incumbents commanding the top positions and F25B (Refrigeration & Heat Pumps) accounting for the dominant share of activity. Filing volume peaked in 2022 and has eased since, though the multi-year window still shows positive growth, and adjacent branches such as domestic heating systems and heat-exchanger details remain comparatively under-served.
Mitsubishi Electric leads a concentrated top tier of established HVAC specialists
These five organisations together account for 34% of the combined total of the hundred largest filers, signalling a meaningful but not absolute concentration at the apex.
A clear tier gap separates the top five from the second cluster. Denso Corporation (1,470), Sanyo Electric Co. Ltd (1,438), Gree Electric Appliance Inc of Zhuhai (1,315), Hitachi Ltd (1,252), and Toshiba (1,157) form a substantial mid-tier, but each sits well below the leading pair. Below rank ten, counts drop sharply toward the 500–600 range.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Mitsubishi Electric Corporation | 4,556 | |
| 2 | Panasonic Holdings Corporation | 3,481 | |
| 3 | Daikin Industries Ltd | 2,928 | |
| 4 | Carrier Corporation | 2,775 | |
| 5 | LG Electronics Inc | 2,147 | |
| 6 | Denso Corporation | 1,470 | |
| 7 | Sanyo Electric Co. Ltd | 1,438 | |
| 8 | Gree Electric Appliance Inc of Zhuhai | 1,315 | |
| 9 | Hitachi Ltd | 1,252 | |
| 10 | Toshiba Corporation | 1,157 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Li Huayu | 922 | |
| 12 | Trane International Inc | 680 | |
| 13 | Hanon Systems Co. Ltd | 638 | |
| 14 | Haier Smart Home Co. Ltd | 624 | |
| 15 | Mitsubishi Heavy Industries Ltd | 608 | |
| 16 | Panasonic Intellectual Property Management Co. Ltd | 576 | |
| 17 | Ebara Corporation | 557 | |
| 18 | Midea Group Co. Ltd | 528 | |
| 19 | Samsung Electronics Co. Ltd | 509 | |
| 20 | Sanden Corporation | 492 |
The leaders’ positions reflect decades of investment in vapour-compression cycle optimisation, inverter control, and refrigerant management. Mitsubishi Electric’s and Daikin’s portfolios span core F25B subclasses extensively, indicating broad defensive coverage rather than niche specialisation — a posture that raises freedom-to-operate cost for new entrants in mainstream cycle architectures.
Patent records from 2024 onward are subject to publication lag and are likely under-counted; conclusions about recent activity should be treated as provisional. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Filing activity peaked in 2022; technology mix is dominated by core refrigeration classes with meaningful adjacent coverage
The annual filing trend and the IPC class breakdown together reveal a field that has reached structural maturity in its core architecture while exhibiting pockets of sparser activity in system-integration and application-specific classes.
Annual filing trend
Filings rose from 738 in 2017 to a peak of 835 in 2022, then eased to 811 in 2023. Figures for 2024 (581) and 2025 (329) reflect publication lag and should not be read as a real decline. The 9% growth recorded over the recent window confirms that the field is still expanding on a multi-year basis, though annual volume has eased from its 2022 peak.
↗ Hover for values · click a bar to ask EurekaTechnology composition
F25B (Refrigeration & Heat Pumps) dominates with 17,754 patent records, roughly five times the next largest class. F28D (Heat-Exchange Apparatus, 3,456), F24F (Air Conditioning & Ventilation, 2,991), F24D (Domestic Heating Systems, 2,753), and F24H (Fluid Heaters & Water Heaters, 1,673) form a secondary tier. Sparser classes — including G05D (Control of Non-Electric Variables), H10N (Solid-State Devices), and F24T (Geothermal Systems) — indicate areas where systematic IP coverage is thinner relative to their technical relevance to heat pump systems.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
High-temperature heat pump and method of using wor…
A fluid circuit in a high-temperature heat pump absorbs thermal energy through the fluid from at least a first reservoir while performing technical work and outputs thermal energy through the fluid to at least a second reservoir, thereby heating the at least one second reservoir. The working medium may be hydrofluoroether or fluoroketone. (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Microcomponent chemical process sheet architecture | 594 |
| 2 | Energy control system | 444 |
| 3 | Variable temperature seat climate control system | 385 |
| 4 | Microcomponent sheet architecture | 359 |
| 5 | Electronic cryogenic surgical probe apparatus and … | 328 |
| 6 | Variable temperature seat climate control system | 326 |
| 7 | Microcomponent assembly for efficient contacting o… | 312 |
| 8 | Automatic fault diagnostic apparatus for a heat pu… | 312 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the competitive structure means for R&D investment decisions
Four dimensions — maturity, concentration, collaboration networks, and geographic reach — each carry distinct implications for teams assessing where to deploy R&D resources in the heat pump space.
Mature field with annual volume easing from its 2022 peak
The lifecycle assessment classifies heat pump IP as mature: annual filings plateaued near their peak and have eased since 2022, consistent with a field whose core vapour-compression architectures are well documented. Multi-year growth remains positive at 9%, suggesting incremental innovation continues in controls, refrigerants, and system integration rather than disruptive architectural shifts. New entrants face a dense prior-art landscape in mainstream cycle designs.
Lifecycle: MatureTop five hold 34% of the hundred largest filers’ combined total
The top five filers’ 34% share of the hundred largest filers’ combined output points to meaningful but not absolute concentration. A substantial mid-tier of seven to ten additional specialists — including Denso, Gree, and Hitachi — preserves competitive diversity. This structure suggests that incremental differentiation in sub-systems (refrigerant circuits, controls, heat exchangers) can still yield defensible positions outside the leaders’ core coverage areas.
Concentration: Moderate-HighDaikin–Daikin Europe is the dominant co-filing pair; Denso anchors a multi-partner cluster
The most active co-filing relationship is between Daikin Industries Ltd and Daikin Europe NV, with 142 joint applications, reflecting coordinated global portfolio management. Mitsubishi Electric Corporation and its European R&D centre account for 32 joint filings. Denso Corporation is the most networked mid-tier player, maintaining active co-filing relationships with the Central Research Institute of Electric Power Industry (24 filings), Tokyo Electric Power Holdings (24 filings), Japan Automobile Research Institute (8 filings), and Mitsubishi Chemical Corporation (8 filings) — indicating a vehicle-electrification-oriented innovation cluster.
Collaboration: ActiveUS office leads, EPO and PCT provide broad international reach
The United States is the lead jurisdiction with 7,682 patent records, followed by Europe via EPO (5,668) and WIPO PCT filings (3,155). Secondary English-speaking markets — United Kingdom (1,075), Australia (1,058), and Canada (988) — round out the main coverage zones. Sparser filings in New Zealand (159), Singapore (105), South Africa (93), and the Philippines (17) suggest limited systematic protection in emerging-market geographies, which may represent freedom-to-operate headroom in those regions.
Geography: US-EPO-PCT CoreGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| Daikin Industries Ltd | Daikin Europe NV | 142 |
| Mitsubishi Electric Corporation | Mitsubishi Electric R&D Centre Europe | 32 |
| Panasonic Corporation | Japan Air Conditioning Systems Co. Ltd | 27 |
| Denso Corporation | Central Research Institute of Electric Power Industry | 24 |
| Denso Corporation | Tokyo Electric Power Holdings Inc | 24 |
| Denso Corporation | Japan Automobile Research Institute | 8 |
| Denso Corporation | Mitsubishi Chemical Corporation | 8 |
| Mitsubishi Electric Corporation | Kamiya Sota | 6 |
| Mitsubishi Electric Corporation | Hatakeyama Kazunori | 6 |
| Carrier Corporation | Springer Carrier GmbH | 6 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Mitsubishi Electric and Carrier lead by volume; Denso and Honeywell show growing recent momentum
The top two applicants by patent records are separated by a meaningful gap from the mid-tier. Recent filing momentum diverges sharply across incumbents, with most established leaders moderating output while Denso and Honeywell show upward trajectories.
Mitsubishi Electric Corporation
Mitsubishi Electric Corporation holds 4,556 patent records, the largest portfolio in the corpus. Its technology focus is concentrated in core F25B subclasses — particularly F25B 1 (410 records), F25B 30 (232 records), and F25B 49 (222 records) — reflecting deep coverage of compression cycle fundamentals and system control. Recent filing momentum is down 47% versus the prior three-year period, consistent with portfolio consolidation in a mature core domain rather than expansion.
patent records: 4,556Denso Corporation
Denso Corporation holds 1,470 patent records and is distinguished by the strongest upward momentum among tracked applicants, with recent filings up 36% versus the prior period. Its technology emphasis skews toward B60H 1 (Vehicle Heating & A/C, 142 records), signalling a vehicle-electrification-driven strategy differentiated from the home-HVAC focus of the top-ranked Japanese peers. Its multi-partner collaboration network — spanning power utilities, automotive research institutes, and chemical companies — further distinguishes its innovation approach.
patent records: 1,470| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Mitsubishi Electric Corporation | 52 | ▼ -47% |
| Carrier Corporation | 70 | ▼ -8% |
| Daikin Industries Ltd | 39 | ▼ -70% |
| LG Electronics Inc | 30 | ▼ -51% |
| Denso Corporation | 30 | ▲ +36% |
| Honeywell International Inc | 32 | ▲ +14% |
| Rheem Manufacturing Company | 51 | ▼ -9% |
| Daikin Europe NV | 26 | ▼ -54% |
Under-served branches adjacent to the F25B core worth watching
Several IPC classes adjacent to the dominant F25B core carry meaningful patent activity but remain at lower relative density, suggesting areas where systematic IP coverage may be thinner and where technically differentiated work could find more open landscape.
F24D · Domestic Heating Systems
F24D accounts for 2,753 patent records — sizeable in absolute terms but representing only 6% of the combined class counts, placing it well below the F25B core. As heat pumps displace gas boilers in residential heating applications, the interface between heat pump units and low-temperature distribution systems (underfloor heating, radiator retrofits, buffer tanks) is a technically critical and commercially expanding area. The relatively lower density here, compared with the compression-cycle core, suggests that systematic IP coverage of whole-system domestic heating integration is less entrenched, offering a plausible entry path for specialists in building services or controls.
Search this in Eureka →F24T · Geothermal Systems
F24T (Geothermal Systems) appears with only 116 patent records, the lowest count among the named adjacent classes and representing a structurally sparse branch relative to its technical relevance. Ground-source heat pumps depend on geothermal collector design, ground heat exchanger optimisation, and soil–fluid thermal interaction — topics that sit squarely in F24T yet remain lightly filed. For teams with expertise in subsurface thermal management or borehole heat exchanger design, this branch represents an under-served adjacent area with plausible technical value, particularly as ground-source systems gain policy support in decarbonisation programmes.
Search this in Eureka →How leading applicants differ by technology sub-class emphasis
Strength of each leader across the main technology routes.
| Player | F25B 30 · Refrigeration & heat pumps | F25B 13 · Refrigeration & heat pumps | F25B 49 · Refrigeration & heat pumps | F25B 1 · Refrigeration & heat pumps | F25B 41 · Refrigeration & heat pumps |
|---|---|---|---|---|---|
| Mitsubishi Electric Corporation | Strong · 232 | Moderate · 197 | Strong · 222 | Strong · 410 | Moderate · 106 |
| Carrier Corporation | Moderate · 149 | Strong · 425 | Strong · 238 | Moderate · 116 | Strong · 228 |
| Daikin Industries Ltd | Moderate · 77 | Strong · 145 | Strong · 114 | Strong · 165 | Moderate · 63 |
| LG Electronics Inc | Strong · 135 | Strong · 172 | Strong · 87 | Moderate · 59 | Moderate · 82 |
| Denso Corporation | Strong · 61 | Strong · 56 | Strong · 53 | Strong · 95 | Strong · 83 |
| Daikin Europe NV | Absent | Strong · 81 | Strong · 73 | Strong · 42 | Absent |
| Rheem Manufacturing Company | Strong · 69 | Absent | Strong · 70 | Absent | Strong · 52 |
Frequently asked questions
The analysis covers 6,055 patent families. Separately, patent-record counts — which can be higher because a single family may be filed in multiple jurisdictions and IPC classes — are used for applicant rankings and technology class breakdowns.
Mitsubishi Electric Corporation leads with 4,556 patent records, ahead of Panasonic Holdings Corporation (3,481), Daikin Industries Ltd (2,928), Carrier Corporation (2,775), and LG Electronics Inc (2,147).
The field is classified as mature. Annual filings peaked in 2022 at 835 patent records and have eased since. The multi-year window still shows 9% growth, indicating continued incremental innovation, but the core architecture is well covered by prior art.
The United States leads with 7,682 patent records, followed by Europe via the EPO (5,668) and WIPO PCT applications (3,155). Secondary coverage includes the United Kingdom (1,075), Australia (1,058), and Canada (988).
Among the tracked applicants, Denso Corporation shows the strongest upward momentum at +36% recent filings versus the prior three-year period, followed by Honeywell International Inc at +14%. Most other leading filers, including Mitsubishi Electric (−47%), Daikin Industries (−70%), and LG Electronics (−51%), show declining recent filing rates.
F24T (Geothermal Systems) is the sparsest named adjacent branch at 116 patent records, followed by F24D (Domestic Heating Systems, 2,753 records) which, despite its absolute size, represents only 6% of combined class counts relative to the F25B core. These branches — particularly geothermal system integration and domestic heating-network coupling — carry plausible technical and commercial relevance with comparatively thinner systematic IP coverage.
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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.