Air Source Heat Pump Reliability Patent Landscape
The air source heat pump reliability patent space is moderately fragmented, with Chinese manufacturers and one UK-based innovator dominating filings; F25B (refrigeration and heat pumps) accounts for the overwhelming majority of technical activity. The field peaked in 2021 and annual volume has since eased, though the multi-year corpus remains substantive at 394 patent families.
Octopus Energy Heating leads a fragmented but China-dominated field
Octopus Energy Heating Ltd holds the top position with 18 patent families, a notable lead over the next tier of Chinese appliance manufacturers — Haier Smart Home, Gree Electric, Guangdong TCL, and multiple Qingdao Haier entities — each clustered between 7 and 8 patent families.
The top five filers account for 19% of the hundred largest filers’ combined total, indicating a moderately fragmented competitive structure with no single entity holding an overwhelming share. The gap between the leader and the second tier is real but not prohibitive.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | Octopus Energy Heating Ltd | 18 | |
| 2 | Haier Smart Home Co Ltd | 8 | |
| 3 | Gree Electric Appliance Inc of Zhuhai | 8 | |
| 4 | GUANGDONG TCL INTELLIGENT HEATING & VENTILATING EQ… | 7 | |
| 5 | Qingdao Haier Air Conditioning Electronics Co Ltd | 7 | |
| 6 | Qingdao Haier Air Conditioner General Corp Ltd | 7 | |
| 7 | GUANGDONG CHIGO HEATING & VENTILATION EQUIP CO LTD | 7 | |
| 8 | Guangdong New Energy Technology Development Co Ltd | 6 | |
| 9 | Carrier Corporation | 6 | |
| 10 | Qingdao Tengyuan Design Accountants Co Ltd | 5 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 11 | Shandong Jianzhu University | 4 | |
| 12 | Beijing Kaikun Guangsheng New Energy Electrical Appliance Co Ltd | 4 | |
| 13 | Zhejiang King Co Ltd | 4 | |
| 14 | Qingdao Economic and Technological Development Zone Haier Water Heater Co Ltd | 4 | |
| 15 | Guangdong Phnix Eco-Energy Solution Co Ltd | 3 | |
| 16 | Guangdong Midea Air Conditioning Equipment Co Ltd | 3 | |
| 17 | Wuxi Tongfang Artificial Environment Co Ltd | 3 | |
| 18 | Northeast Electric Power University | 3 | |
| 19 | Zhejiang Zhongguang Electric Co Ltd | 3 | |
| 20 | Shandong Airpower Energy Saving Equipment Co Ltd | 3 |
The presence of Octopus Energy Heating — a UK-based heat pump-focused entrant — at the summit signals that specialist reliability-focused players can challenge established HVAC manufacturers, particularly in markets such as the UK and. Europe where heat pump adoption is policy-driven.
Filings from 2024 onward are subject to publication lag and likely undercount actual filing activity; the apparent softness in recent years should not be interpreted as a structural withdrawal by participants. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Activity peaked in 2021; core heat pump IP dominates, adjacent branches remain sparse
The annual filing trend chart reveals a field that expanded rapidly from 2017 to 2021 and has since eased from its peak. The technology composition chart shows F25B (refrigeration and heat pumps) as the clear dominant branch, with a long tail of adjacent classes at much lower volumes.
Annual filing trend
Filings grew from 15 in 2017 to a peak of 68 in 2021, then moderated to the 37–66 range through 2023–2024. The 2025 and 2026 figures (37 and 3 respectively) reflect publication lag and should be treated as floor estimates. The multi-year trend remains substantively active despite easing from the 2021 peak.
↗ Hover for values · click a bar to ask EurekaTechnology composition
F25B (refrigeration and heat pumps) is the dominant branch by a wide margin, reflecting the core refrigerant-circuit focus of reliability engineering. F25D (refrigerators and cooling), F24F (air conditioning and ventilation), F24H (fluid and water heaters), and F24D (domestic heating systems) each appear at much lower volumes, highlighting adjacent reliability challenges that remain underexplored.
↗ 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.
VERFAHREN ZUM ERKENNEN EINER KÄLTEMITTELLECKAGE EI…
| # | Patent | Citations |
|---|---|---|
| 1 | Extended Range Heat Pump | 51 |
| 2 | 一种空气源热泵机组及其电子膨胀阀的控制方法和装置 | 50 |
| 3 | 一种双蒸发器交替除霜空气源热泵机组及其除霜方法 | 40 |
| 4 | 一种空气源热泵系统空调器低温启动的控制方法及空调器 | 30 |
| 5 | 基于图像处理及热气旁通的空气源热泵除霜系统及方法 | 29 |
| 6 | 一种超低温空气源热泵 | 28 |
| 7 | 一种即热式热回收型浴室热泵热水器 | 23 |
| 8 | 一种除霜控制方法及空气源热泵系统 | 19 |
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 IP structure means for R&D investment decisions
Four structural observations — maturity stage, concentration, collaboration networks, and geographic footprint — define where competitive pressure is highest and where room to maneuver still exists.
Post-peak field with a consolidating core
The lifecycle evidence places ASHP reliability in a decline stage, with annual filings easing back from the 2021 peak of 68 families. This signals that foundational refrigerant-circuit reliability approaches are maturing; differentiation now likely requires moving into adjacent branches such as vibration damping, smart controls, or defrost optimization rather than repeating established approaches.
Post-peak · 2021 highModerate fragmentation with a clear specialist at the top
The top five filers hold 19% of the hundred largest filers’ combined total, indicating no single entity controls the field. Octopus Energy Heating’s lead of 18 patent families — more than double the next cluster — suggests a focused, reliability-first filing strategy rather than broad portfolio building. Entrants can still build meaningful positions in under-covered sub-domains.
Fragmented · specialist leaderHaier group entities form the most active co-filing network
The most active co-filing relationships are within the Haier ecosystem: Haier Smart Home, Qingdao Haier Air Conditioning Electronics, and Qingdao Haier Air Conditioner General Corp each share 7 joint filings with one another. A further link connects Haier Smart Home with Qingdao Economic and Technological Development Zone Haier Water Heater (1 joint filing). No cross-group or academic-industry collaboration of comparable density is evident in the data.
Haier group · 7 joint familiesChina dominates filings; Western markets are thinly covered
China accounts for the largest share of jurisdictional coverage, followed by the United States, the United Kingdom, Europe (EPO), and WIPO (PCT) at substantially lower counts. Given strong heat pump policy mandates in Europe and the UK, the relatively low EPO and WIPO filing counts represent a potential vulnerability for Chinese-origin patents and an opening for Western applicants to establish prior coverage.
China-dominant · EU thinGo 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 |
|---|---|---|
| Haier Smart Home Co Ltd | Qingdao Haier Air Conditioning Electronics Co Ltd | 7 |
| Haier Smart Home Co Ltd | Qingdao Haier Air Conditioner General Corp Ltd | 7 |
| Qingdao Haier Air Conditioning Electronics Co Ltd | Qingdao Haier Air Conditioner General Corp Ltd | 7 |
| Haier Smart Home Co Ltd | Qingdao Economic and Technological Development Zone Haier Water Heater Co Ltd | 1 |
| Qingdao Economic and Technological Development Zone Haier Water Heater Co Ltd | Qingdao Haier New Energy Electric Appliance Co Ltd | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Octopus Energy Heating leads on volume; Haier group leads on collaborative depth
Two distinct strategic postures define the top tier: a specialist UK innovator building a concentrated reliability portfolio, and a network of Chinese appliance manufacturers leveraging intra-group co-filing to distribute IP across related entities.
Octopus Energy Heating Ltd
Octopus Energy Heating Ltd holds 18 patent families, the largest position in this corpus, with a technology focus concentrated across F25B subclasses covering heat pump control, low-temperature operation, and system-level refrigerant management (F25B 13, F25B 47, F25B 30). The applicant momentum data records it as a new entrant, indicating its entire portfolio was built in the recent window — a fast, focused ramp from a standing start.
families: 18Haier Smart Home Co Ltd
Haier Smart Home Co Ltd holds 8 patent families, co-filed extensively with Qingdao Haier Air Conditioning Electronics and Qingdao Haier Air Conditioner General Corp (7 joint families each), and focuses on F25B subclasses covering heat pump cycles, safety controls, and flow management (F25B 30, F25B 49, F25B 41). Like the leader, momentum data records it as a new entrant in the recent window. The group structure effectively multiplies its visible coverage across related Qingdao Haier entities.
families: 8| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Octopus Energy Heating Ltd | 18 | ▲ new entrant |
| Gree Electric Appliance Inc of Zhuhai | 4 | ▲ new entrant |
| Haier Smart Home Co Ltd | 4 | ▲ new entrant |
| Carrier Corporation | 2 | ▲ new entrant |
| Qingdao Haier Air Conditioning Electronics Co Ltd | 3 | ▲ new entrant |
| Qingdao Haier Air Conditioner General Corp Ltd | 3 | ▲ new entrant |
| Guangdong Chigo Heating & Ventilation Equipment Co Ltd | 5 | ▲ new entrant |
| Qingdao Economic and Technological Development Zone Haier Water Heater Co Ltd | 1 | ▲ new entrant |
Under-served branches adjacent to the dominant heat pump core
Several IPC classes appear at low coverage relative to F25B, pointing to areas where reliability-related invention is sparse. These are observations of relative filing density, not confirmed commercial gaps; technical merit and entry feasibility should be assessed independently.
F16F · Springs & vibration dampers
With only 25 records against the dominant F25B base, vibration and acoustic isolation — critical for residential ASHP reliability and noise compliance — is notably sparse. The most-cited patents include titles focused on defrost and low-temperature start-up but none specifically on mechanical isolation; an entrant with compressor-mounting or anti-vibration expertise could establish a distinct position, particularly for Western markets where residential noise regulations are tightening.
Search this in Eureka →G06N · AI-based computing models
Only 2 records appear under G06N, despite the evident relevance of AI-driven predictive maintenance and fault detection to ASHP reliability. Given that the broader ASHP control literature is maturing (F25B dominant), applying machine-learning diagnostic models to heat pump degradation prediction represents a technically plausible and relatively open sub-domain. The low existing count means freedom-to-operate barriers are low, though commercialization pathways would depend on integration with existing system architectures.
Search this in Eureka →How leading applicants differ by technology sub-route
Route coverage across the main technology branches in the current evidence set.
| Player | F25B 30 · Refrigeration & heat pumps | F25B 49 · Refrigeration & heat pumps | F25B 47 · Refrigeration & heat pumps | F25B 41 · Refrigeration & heat pumps | F25B 13 · Refrigeration & heat pumps |
|---|---|---|---|---|---|
| Octopus Energy Heating Ltd | Strong · 10 | Strong · 10 | Strong · 12 | Absent | Strong · 18 |
| Gree Electric Appliance Inc of Zhuhai | Moderate · 4 | Strong · 8 | Absent | Moderate · 4 | Moderate · 3 |
| Haier Smart Home Co Ltd | Strong · 5 | Strong · 5 | Strong · 3 | Strong · 3 | Absent |
| Carrier Corporation | Strong · 7 | Strong · 7 | Absent | Absent | Absent |
| Guangdong TCL Intelligent Heating & Ventilating Equipment Co Ltd | Strong · 5 | Strong · 6 | Absent | Absent | Absent |
| Qingdao Haier Air Conditioner General Corp Ltd | Strong · 4 | Strong · 4 | Strong · 3 | Absent | Absent |
| Qingdao Haier Air Conditioning Electronics Co Ltd | Strong · 4 | Strong · 4 | Strong · 3 | Absent | Absent |
Frequently asked questions
The corpus in scope contains 394 patent families. China accounts for the largest jurisdictional coverage, with US, UK, EPO, and PCT filings present at much lower counts.
Octopus Energy Heating Ltd holds the top position with 18 patent families, ahead of Haier Smart Home Co Ltd and Gree Electric Appliance Inc of Zhuhai, each with 8 patent families.
Annual filing volume peaked in 2021 at 68 families. Activity has eased from that peak, with the lifecycle evidence characterizing the field as in a decline stage. Figures for 2025 and 2026 are subject to publication lag and undercount actual activity.
F25B (refrigeration and heat pumps) is the dominant branch by a wide margin. F25D (refrigerators and cooling), F24F (air conditioning and ventilation), F24H (fluid and water heaters), and F24D (domestic heating systems) appear at much lower volumes.
Vibration and acoustic isolation (F16F, 25 records) and AI-based fault detection and predictive maintenance (G06N, 2 records) are notably sparse relative to the dominant refrigerant-circuit core, making them potential areas for differentiated filing strategies.
The Haier group entities form the most active co-filing network: Haier Smart Home, Qingdao Haier Air Conditioning Electronics, and Qingdao Haier Air Conditioner General Corp each share 7 joint patent families with one another. No comparable cross-group collaboration is evident in the evidence.
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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.
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