MLB036S4S-2P
MLB036S4S-2P is in the certified data.
Its certified full-speed heating output at 5°F is 36,000–40,000 Btu/h10.55–11.72 kW, 86–100% of its 47°F rating (tests at different compressor speeds), depending on the pairing.
Lennox · mini-split heat pump
MLB036S4S-2P is in the certified data as of Sep 19, 2026.
- 36,000 Btu (3-ton)
- Mini-split
- Variable speed
- US and Canada
Certified heating and cooling
Heating at 47°F
39,00011.43NR
No 47°F rating for this pairing.
32,0009.38NR at 17°F
36,60010.73NR at 5°F
Btu/hkW, certified
1.75NR COP at 5°F
Heating and cooling by outdoor temperature
This pairing delivers 39,000 Btu/h11.43 kW of heat at 47°F, 32,000 Btu/h9.38 kW at 17°F, and 36,600 Btu/h10.73 kW at 5°F, 94% of its 47°F rating. It delivers 36,000 Btu/h10.55 kW of cooling at 95°F. At 5°F that is 5,600 Btu/h1.64 kW above the example heating load of 31,000 Btu/h9.09 kW; at 95°F it is 20,500 Btu/h6.01 kW above the example cooling load of 15,500 Btu/h4.54 kW.
Each bar is a separate certified test, drawn at its outdoor temperature, starting at zero. The 47°F figure is at normal speed; the 17 and 5°F figures are at full speed. The short dark line on each bar is the median of 3-ton mini-split models, one value per model. The shaded 17 to 45°F band is the frosting range: the outdoor coil can frost, and the unit pauses to defrost.
The dashed lines are example loads for a typical area of about 1,300 sq ft where winters reach 5°F: heating runs from 31,000 Btu/h9.09 kW at 5°F to 0 at 65°F, and cooling runs from 0 at 65°F to 15,500 Btu/h4.54 kW at 95°F, at 1,000 sq ft per ton. A house in a hot climate or with large west-facing windows can need twice as much cooling. They are examples, not your building.
AHRI certificate 210665640 · listed by Lennox · certified May 28, 2026 · 2 pairings share these values
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Threshold comparisons use the unit’s certified figures across its pairings. Programs also set service-area, installation, and product-list requirements.
Certified output and power use
| Outdoor temperature | Certified outputBtu/h | One scale | vs class median | COPat 5°F |
|---|---|---|---|---|
| 5°Ffull speed | 36,60010.73 kW | +18% | 1.75 | |
| 17°Ffull speed | 32,0009.38 kW | +8% | NR | |
| 47°Fnormal speed | 39,00011.43 kW | +5% | NR | |
| 95°Fcooling, full load | 36,00010.55 kW | — | NR |
EER2 8.8 in that test. SEER2 17.6 over the modeled cooling season.
Power use at each temperature
- Electrical input in the 5°F full-speed test
- 6.13kW
- Electrical input in the 95°F cooling test
- 4.09kW
- Seasonal average heating COP
- 2.93
These exclude backup resistance heat.
How it compares with other 36,000 Btu heat pumps
3-ton mini-split models
- This pairing at 5°F
- 36,600 Btu/h10.73 kWNR
- This unit at 5°F median across its pairings
- 36,600 Btu/h10.73 kW
- Median of 3-ton mini-split models at 5°F
- 31,000 Btu/h9.09 kW
- Models in this group
- 553
This unit is above 79% of them, at number 116 of 553 by heat at 5°F. The middle half of the group runs 26,000 to 36,000 Btu/h.
Closest models by heat at 5°F
- MXZ-SM36NLHZMitsubishi Electric · 37,000 Btu/h
- NDHAMB-36-OContinental · 37,000 Btu/h
- ACIQ-36ZPL-HP230B1HVAC, ACiQ + 3 more · 36,600 Btu/h
- A-VMH36QV-1ACentury and Comfort-Aire · 36,400 Btu/h
- AOU36RLXFZHFujitsu · 36,400 Btu/h
- AOUH36KWAH4Fujitsu · 36,400 Btu/h
Every 36,000 Btu (3-ton) unit, ranked by cooling efficiency, then heating efficiency
Certified values for MLB036S4S-2P
6 pairings · 6 AHRI certificates
This pairing is the one shown above. Under all pairings, a single figure means every pairing agrees and a range means the pairing decides.
| This pairing | All pairings | |
|---|---|---|
| Heating | ||
| Heat output at 47°F normal speed | 39,000 Btu/h11.43 kWNR | 39,000–42,000 Btu/h11.43–12.31 kW |
| Heat output at 17°F full speed | 32,000 Btu/h9.38 kWNR | 32,000–33,400 Btu/h9.38–9.79 kW |
| Heat output at 5°F full speed | 36,600 Btu/h10.73 kWNR | 36,000–40,000 Btu/h10.55–11.72 kW |
| Heat output below 5°F | NR | NR |
| Cold output 5°F output as a % of the 47°F rating | 94%NR | |
| COP at 5°F full speed | 1.75NR | 1.75–1.98 |
| HSPF2 Region IV | 10.0NR | 10.0–11.0 |
| Cooling | ||
| Cooling capacity at 95°F full-load test | 36,000 Btu/h10.55 kWNR | 36,000 Btu/h10.55 kW |
| EER2 at 95°F | 8.8NR | 8.8–9.5 |
| SEER2 cooling season | 17.6NR | 16.5–19.4 |
| Cooling at other temperatures | NR | NR |
| Equipment and listing | ||
| Refrigerant | R-410A | |
| Compressor | Variable speed | |
| Indoor unit | MCFA036S4* | 6 indoor units |
| Furnace | No furnace | None |
| Cold-climate designation EPA's designation, as published | Yes | On every pairing |
| ENERGY STAR Most Efficient EPA's designation, as published | No | On no pairings |
| Where it is sold | US and Canada | US and Canada |
| Model string as certified | MLB036S4S-2P | |
Pairings, by indoor-unit class
6 indoor units · 6 certified pairings
One row per indoor unit certified with this outdoor unit.
Ductless indoor · 6 indoor units
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M33C036S4* (the pairing on screen) LENNOX 40,000 Btu/h11.72 kWat 5°F, full speed
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M33C036S4-*P (the pairing on screen) LENNOX 40,000 Btu/h11.72 kWat 5°F, full speed
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MCFA036S4* (the pairing on screen) LENNOX 36,600 Btu/h10.73 kWat 5°F, full speed
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MCFA036S4-*P (the pairing on screen) LENNOX 36,600 Btu/h10.73 kWat 5°F, full speed
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MMDB036S4* (the pairing on screen) LENNOX 36,000 Btu/h10.55 kWat 5°F, full speed
-
MMDB036S4-*P (the pairing on screen) LENNOX 36,000 Btu/h10.55 kWat 5°F, full speed
| Indoor unit | Brand | At 5°FBtu/hkW · full speed | At 47°FBtu/hkW · normal speed | At 95°FBtu/hkW · cooling | Cold output% of 47°F rating | COP 5°Ffull speed | Cold climate | Pairings |
|---|---|---|---|---|---|---|---|---|
| M33C036S4* (the pairing on screen) | LENNOX | 40,00011.72 | 40,00011.72 | 36,00010.55 | 100% | 1.85 | Yes | 1 |
| M33C036S4-*P (the pairing on screen) | LENNOX | 40,00011.72 | 40,00011.72 | 36,00010.55 | 100% | 1.85 | Yes | 1 |
| MCFA036S4* (the pairing on screen) | LENNOX | 36,60010.73 | 39,00011.43 | 36,00010.55 | 94% | 1.75 | Yes | 1 |
| MCFA036S4-*P (the pairing on screen) | LENNOX | 36,60010.73 | 39,00011.43 | 36,00010.55 | 94% | 1.75 | Yes | 1 |
| MMDB036S4* (the pairing on screen) | LENNOX | 36,00010.55 | 42,00012.31 | 36,00010.55 | 86% | 1.98 | Yes | 1 |
| MMDB036S4-*P (the pairing on screen) | LENNOX | 36,00010.55 | 42,00012.31 | 36,00010.55 | 86% | 1.98 | Yes | 1 |
Sold as, and units with identical certified values
Variants of the same model number
2 units in this group. Basis: identical certified values in the certified data. This grouping is our inference, not a field in the certified data.
1 of 2 shown.
What affects the price
We don't have prices. These things drive the cost.
- The size of the unit, and the indoor equipment on the same certificate.
- Whether existing ductwork is reused, altered, or replaced.
- The electrical work: a circuit, a disconnect, and sometimes a panel change.
- Refrigerant line length and how the outdoor unit is mounted.
- Permits and inspection, which vary by municipality.
- Removing and disposing of the old equipment.
- Local labor rates and how busy the season is.
- Rebates and tax credits, which change and have deadlines.
History and definitions
History
- First certified record
- Most recent certified record
- Measurements reported
- May 28, 2026
- Status
- In the certified data
Field definitions
- COP
- Heat delivered for each unit of electricity used. A COP of 2.5 gives 2.5 times the heat of an electric baseboard heater.
- HSPF2
- Heating efficiency over a typical season. Higher uses less electricity.
- SEER2
- Cooling efficiency over a typical season. Higher uses less electricity.
- EER2
- Cooling output divided by electrical input in the 95°F full-load test, in Btu/h per watt.
- Cold output
- Heat output at 5°F as a percentage of the 47°F rating.
- % of rating at 17°F
- Heat output at 17°F as a percentage of the 47°F rating.
NR not in the certified dataNC not cold-climate certifiedSP single pairing onlyVP varies by pairing; see the pairings tableWD withdrawn since the certified data was last read