# Pioneer Quantum Ultra 42,000 BTU 5-zone multi-zone outdoor unit (YNL-24)

> Pioneer Quantum Ultra 42,000 BTU 5-zone multi-zone outdoor unit (YNL-24) (YN050GLSI24M5G) is a 42,000 BTU multi-zone outdoor unit from Pioneer Quantum Ultra. It runs on 208/230V, runs up to 5 indoor units, heats down to -13 °F by the brand's rating, uses R-454B refrigerant, and carries a 5-year compressor warranty. Lowest in-stock price on file: $3,138 at Pioneer (checked Oct 14, 2026).

- Line: [Pioneer Quantum Ultra](https://minisplitfacts.com/lines/pioneer-quantum-ultra/)
- Category: [Multi-zone outdoor units](https://minisplitfacts.com/compare/multi-zone-outdoor/)
- Size tier within its line: 42k
- 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-42k-5-zone-outdoor-ynl-24/

## Specifications

| Spec | Value | Source |
|---|---|---|
| Model number | YN050GLSI24M5G | [pioneerminisplit.com](https://pioneerminisplit.com/products/pioneer-multi-5-circuit-quantum-ultra-series-22-seer2-quint-zone-outdoor-section-inverter-energy-star-air-conditioner-heat-pump-230v) (brand, page, 2026-10-14) |
| Size | 42,000 BTU/h | [pioneerminisplit.com](https://pioneerminisplit.com/products/pioneer-multi-5-circuit-quantum-ultra-series-22-seer2-quint-zone-outdoor-section-inverter-energy-star-air-conditioner-heat-pump-230v) (brand, page, 2026-10-14) |
| Voltage | 208/230V | [pioneerminisplit.com](https://pioneerminisplit.com/products/pioneer-multi-5-circuit-quantum-ultra-series-22-seer2-quint-zone-outdoor-section-inverter-energy-star-air-conditioner-heat-pump-230v) (brand, page, 2026-10-14) |
| Indoor units it runs | 5 | [pioneerminisplit.com](https://pioneerminisplit.com/products/pioneer-multi-5-circuit-quantum-ultra-series-22-seer2-quint-zone-outdoor-section-inverter-energy-star-air-conditioner-heat-pump-230v) (brand, page, 2026-10-14) |
| SEER2 (cooling efficiency) | not published |  |
| EER2 (efficiency at 95 °F) | not published |  |
| HSPF2 (heating efficiency) | not published |  |
| Rated cooling capacity | not published |  |
| Heating capacity at 47 °F | 42,000 BTU/h | [energystar.gov](https://www.energystar.gov/productfinder/product/certified-heat-pumps/details/3999486) (certification, feed, 2026-10-14) |
| Heating capacity at 17 °F | not published |  |
| Heating capacity at 5 °F | not published |  |
| COP at 5 °F | not published |  |
| Heats down to | -13 °F | [pioneerminisplit.com](https://pioneerminisplit.com/products/pioneer-multi-5-circuit-quantum-ultra-series-22-seer2-quint-zone-outdoor-section-inverter-energy-star-air-conditioner-heat-pump-230v) (brand, page, 2026-10-14) |
| Refrigerant | R-454B | [energystar.gov](https://www.energystar.gov/productfinder/product/certified-heat-pumps/details/3999486) (certification, feed, 2026-10-14) |
| ENERGY STAR certified | yes | [energystar.gov](https://www.energystar.gov/productfinder/product/certified-heat-pumps/details/3999486) (certification, feed, 2026-10-14) |
| ENERGY STAR cold climate | yes | [energystar.gov](https://www.energystar.gov/productfinder/product/certified-heat-pumps/details/3999486) (certification, feed, 2026-10-14) |
| Line connection | Flare | [pioneerminisplit.com](https://pioneerminisplit.com/products/pioneer-multi-5-circuit-quantum-ultra-series-22-seer2-quint-zone-outdoor-section-inverter-energy-star-air-conditioner-heat-pump-230v) (brand, page, 2026-10-14) |
| Wi-Fi control | not published |  |
| Outdoor sound level | not published |  |
| Compressor warranty | 5 years | [pioneerminisplit.com](https://www.pioneerminisplit.com/pages/warranty) (brand, page, 2026-10-14) |
| 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 | $3,138 | in stock | 2026-10-14 | [View at Pioneer](https://pioneerminisplit.com/products/pioneer-multi-5-circuit-quantum-ultra-series-22-seer2-quint-zone-outdoor-section-inverter-energy-star-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.

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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.