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Nature of business and organization (Details Narrative) - USD ($) | 1 Months Ended | 6 Months Ended |  |  |
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Nov. 30, 2023 | Mar. 31, 2025 | Mar. 29, 2023 | Mar. 22, 2023 | Mar. 08, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Shareholders Description | the shareholders of the Company and the Board of Directors of the Company approved a subdivision of each of the issued and unissued shares with a par value of US$0.0001 each into 100 shares with a par value of US$0.000001 each (the “Share Subdivision”), such that immediately following the Share Subdivision, the authorized share capital of the Company became US$50,000 divided into 50,000,000,000 ordinary shares of par value US$0.000001 each, and the issued and outstanding number of ordinary shares became 10,000,000. Upon completion of the Share Subdivision, 1,000,000,000 authorized but unissued ordinary shares with a par value of US$0.000001 each were re-designated and re-classified as 1,000,000,000 preference shares with a par value of US$0.000001 each (the “Re-designation”), such that immediately following the Re-designation, the authorized share capital of the Company became US$50,000 divided into (i) 49,000,000,000 ordinary shares of a par value of US$0.000001 each and (ii) 1,000,000,000 preference shares of a par value of US$0.000001 each. | the Company and the Board of Directors of the Company approved a subdivision of each of the issued and unissued shares with a par value of US$0.0001 each into 100 shares with a par value of US$0.000001 each, such that immediately following the Share Subdivision, the authorized share capital of the Company became US$50,000 divided into 50,000,000,000 ordinary shares of par value US$0.000001 each, and the issued and outstanding number of ordinary shares became 10,000,000. Upon completion of the Share Subdivision, 1,000,000,000 authorized but unissued ordinary shares with a par value of US$0.000001 each were re-designated and re-classified as 1,000,000,000 preference shares with a par value of US$0.000001 each (the “Re-designation”), such that immediately following the Re-designation, the authorized share capital of the Company became US$50,000 divided into (i) 49,000,000,000 ordinary shares of a par value of US$0.000001 each and (ii) 1,000,000,000 preference shares of a par value of US$0.000001 each. |  |  |
Surrendered an aggregate shares |  | 4,500,000 |  |  |
Surrendered an aggregate per value |  | $ 0.000001 |  |  |
Chengdu Shanyou HVAC Engineering Co., Ltd. [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Consideration Amount |  |  |  |  | $ 68,000
Shanyou H V A C [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Consideration Amount |  |  |  | $ 1,700,000,000 |
Existing shareholders shares |  |  |  | 70,000,000 |
Emerald Investments International L L C [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Consideration Amount |  |  |  | $ 816,000,000 |
Existing shareholders shares |  |  |  | 30,000,000 |
Chengdu Shanyou H V A C [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Consideration Amount |  |  | $ 1,600,000 |  |

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