# Pioneer Quantum Ultra 9,000 BTU wall mount indoor unit (MSI-24)

> Pioneer Quantum Ultra 9,000 BTU wall mount indoor unit (MSI-24) (WT009GLSI24HLG) is a 9,000 BTU indoor unit from Pioneer Quantum Ultra. It has a wall mount indoor unit, runs on 208/230V, and uses R-454B refrigerant. Lowest in-stock price on file: $398 at Pioneer (checked Oct 14, 2026).

- Line: [Pioneer Quantum Ultra](https://minisplitfacts.com/lines/pioneer-quantum-ultra/)
- Category: [Indoor units](https://minisplitfacts.com/compare/indoor-unit/)
- Size tier within its line: 9k
- Status: current
- Data confidence: confirmed (last verified 2026-10-14; [what this means](https://minisplitfacts.com/how-we-compare/#confidence))
- Page: https://minisplitfacts.com/products/pioneer-quantum-ultra-9k-wall-indoor-unit-msi-24/

## Specifications

| Spec | Value | Source |
|---|---|---|
| Model number | WT009GLSI24HLG | [pioneerminisplit.com](https://pioneerminisplit.com/products/pioneer-multi-zone-9-000-btu-quantum-ultra-indoor-section-ductless-mini-split-wi-fi-inverter-air-conditioner-heat-pump-230v) (brand, page, 2026-10-14) |
| Size | 9,000 BTU/h | [pioneerminisplit.com](https://pioneerminisplit.com/products/pioneer-multi-zone-9-000-btu-quantum-ultra-indoor-section-ductless-mini-split-wi-fi-inverter-air-conditioner-heat-pump-230v) (brand, page, 2026-10-14) |
| Indoor unit style | Wall mount | [pioneerminisplit.com](https://pioneerminisplit.com/products/pioneer-multi-zone-9-000-btu-quantum-ultra-indoor-section-ductless-mini-split-wi-fi-inverter-air-conditioner-heat-pump-230v) (brand, page, 2026-10-14) |
| Voltage | 208/230V | [pioneerminisplit.com](https://pioneerminisplit.com/products/pioneer-multi-zone-9-000-btu-quantum-ultra-indoor-section-ductless-mini-split-wi-fi-inverter-air-conditioner-heat-pump-230v) (brand, page, 2026-10-14) |
| Refrigerant | R-454B | [pioneerminisplit.com](https://pioneerminisplit.com/products/pioneer-multi-zone-9-000-btu-quantum-ultra-indoor-section-ductless-mini-split-wi-fi-inverter-air-conditioner-heat-pump-230v) (brand, page, 2026-10-14) |
| Line connection | Flare | [pioneerminisplit.com](https://pioneerminisplit.com/products/pioneer-multi-zone-9-000-btu-quantum-ultra-indoor-section-ductless-mini-split-wi-fi-inverter-air-conditioner-heat-pump-230v) (brand, page, 2026-10-14) |
| Wi-Fi control | not published |  |
| Indoor sound level (quietest) | not published |  |
| Parts warranty | 5 years | [pioneerminisplit.com](https://www.pioneerminisplit.com/pages/warranty) (brand, page, 2026-10-14) |
| Warranty if you install it yourself | Kept | [pioneerminisplit.com](https://www.pioneerminisplit.com/pages/warranty) (brand, page, 2026-10-14) |

## Where to buy

| Store | Price (USD) | Availability | Checked | Link |
|---|---|---|---|---|
| Pioneer | $398 | in stock | 2026-10-14 | [View at Pioneer](https://pioneerminisplit.com/products/pioneer-multi-zone-9-000-btu-quantum-ultra-indoor-section-ductless-mini-split-wi-fi-inverter-air-conditioner-heat-pump-230v) |

Prices are re-checked weekly; a date more than a month old means the store could not be re-read.

## The equivalent in other lines

Same category, same size tier (9k), different line:

- [MRCOOL DIY 5th Gen 9,000 BTU ceiling cassette indoor unit](https://minisplitfacts.com/products/mrcool-diy-5th-gen-9k-ceiling-cassette-indoor-unit/) — $1,368
- [MRCOOL Olympus 9,000 BTU wall mount indoor unit](https://minisplitfacts.com/products/mrcool-olympus-9k-wall-mount-indoor-unit/)
- [MRCOOL Olympus 9,000 BTU ceiling cassette indoor unit](https://minisplitfacts.com/products/mrcool-olympus-9k-ceiling-cassette-indoor-unit/)
- [MRCOOL Olympus 9,000 BTU concealed duct indoor unit](https://minisplitfacts.com/products/mrcool-olympus-9k-slim-duct-indoor-unit/)
- [MRCOOL DIY 5th Gen 9,000 BTU wall mount indoor unit](https://minisplitfacts.com/products/mrcool-diy-5th-gen-9k-wall-mount-indoor-unit/) — $516
- [Senville AURA 9,000 BTU ceiling cassette multi-zone indoor unit](https://minisplitfacts.com/products/senville-aura-9k-cassette-indoor-unit/) — $469.99
- [Senville AURA 9,000 BTU wall mount multi-zone indoor unit](https://minisplitfacts.com/products/senville-aura-9k-wall-indoor-unit/) — $399.99
- [Senville AURA 9,000 BTU one-way cassette multi-zone indoor unit](https://minisplitfacts.com/products/senville-aura-9k-one-way-cassette-indoor-unit/) — $469.99


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MiniSplit Facts lists modular tool storage from every brand side by side, with a source for every spec. [How we compare](https://minisplitfacts.com/how-we-compare/). Data as of 2026-10-14.