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Five series, three formats. The 2 × 2 M22D fits a single 24 × 24 in. ceiling tile. The one-way M1WD 12,000 is only 5-5/16 in. tall. The 3 × 3 M33D goes up to 30,000 BTU/h. Tell us your ceiling, the space above it and the capacity: we show you what fits, with each head’s certified system.
Five series, from 9,000 to 30,000 BTU/h. Each product page gives the head, its outdoor unit, the AHRI number and, when the system qualifies, the indicative LogisVert amount.
Dimensions come from each head’s LENNOX documents. Performance belongs to the system: the head and its outdoor unit, under one AHRI number.
Ceiling: the room the panel takes. Height: the head’s body above the ceiling, when LENNOX publishes it. The rest we measure at the visit.
Dimensions: M22D form 211083; M22A/M33C bulletin 211043; M1WD012S6-1P submittal; LENNOX Pros for the M33D.
Published heights, to scale
Dark line: your 12 in. The M22D is not here: its height is taken from the LENNOX drawing.
A single tile: M22D 12,000 and M22A 12,000. Published height under your 12 in.: M1WD 12,000 and M22A 12,000. To confirm at the visit: M22D 12,000.
M22D 12,000Four-way · 2 × 2 · R-32
With MMLD012S6S-1P · AHRI 216581327 · SEER2 22.0 · HSPF2 10.4 · heats down to -25 °C
M1WD 12,000One-way · R-32
With MMLD012S6S-1P · AHRI 216581321 · SEER2 21.0 · HSPF2 9.5 · heats down to -25 °C
M22A 12,000Four-way · 2 × 2 · R-410A
With MPC012S4S-1P · AHRI 207683515 · SEER2 22.7 · HSPF2 9.9 · heats down to -25 °C
Each head’s name opens its product page. The AHRI rating, the efficiency and the heating range belong to the head and outdoor unit pair.
Two ways to put the heat pump in the ceiling, on the same MMLD012 outdoor unit. The cassette shows and blows through its panel; the ducted unit hides above the ceiling and blows through ducts.
Ratings: ENERGY STAR (Oct. 28, 2026) and MMLD form 211076 (EER2); sound, ceiling and remote: LENNOX forms 211083, 211088 and 211035. Pink rows are the differences. See the LENNOX ducted units.
LENNOX designs it for a single 24 × 24 in. (610 × 610 mm) ceiling tile opening. In a standard suspended ceiling, one tile comes out and the grid stays in place.
LENNOX, form 211083, p. 2-3.That is the body height of the M1WD 12,000 on its LENNOX sheet, about half the 10-3/8 in. of an M22A. When there is little room above the ceiling, it is the first one we look at.
LENNOX, M1WD012S6-1P submittal; bulletin 211043.LENNOX supplies the wireless remote with wall units and floor consoles only; for the other heads, cassettes included, it is optional. Plan for it on the quote.
LENNOX, form 211035 (Sept. 2025).A cassette does not work alone. Its AHRI number, efficiency and heating range belong to the system it forms with its outdoor unit.
| Head | Outdoor unit | AHRI | ENERGY STAR (Canada) | Certified cooling | Heat at -8.3 °C | SEER2 · HSPF2 | Heats down to | Indicative LogisVert |
|---|---|---|---|---|---|---|---|---|
| M22D 9,0002 × 2 · R-32 | MMLD009S6S-1P | 216581326 | Yes · cold climate | 9,100 BTU/h | 9,700 BTU/h | 22.0 · 10.6 | -25 °C | — |
| M22D 12,0002 × 2 · R-32 | MMLD012S6S-1P | 216581327 | Yes · cold climate | 12,000 BTU/h | 10,700 BTU/h | 22.0 · 10.4 | -25 °C | $1,284 |
| M22D 18,0002 × 2 · R-32 | MMLD018S6S-1P | 215810027 | Yes · cold climate | 17,000 BTU/h | 15,600 BTU/h | 20.5 · 9.5 | -25 °C | $1,872 |
| M33D 18,0003 × 3 · R-32 | MMLD018S6S-1P | 215810024 | Yes · cold climate | 18,000 BTU/h | 12,400 BTU/h | 23.8 · 9.6 | -25 °C | $1,488 |
| M33D 24,0003 × 3 · R-32 | MMLD024S6S-1P | 215810028 | Yes · cold climate | 24,000 BTU/h | 18,600 BTU/h | 22.0 · 10.2 | -25 °C | $2,232 |
| M33D 30,0003 × 3 · R-32 | MMLD030S6S-1P | 215810030 | Yes · cold climate | 30,000 BTU/h | 27,000 BTU/h | 22.8 · 10.7 | -25 °C | $3,240 |
| M1WD 9,000One-way · R-32 | MMLD009S6S-1P | 216581320 | Yes · cold climate | 9,000 BTU/h | 9,100 BTU/h | 22.1 · 9.5 | -25 °C | — |
| M1WD 12,000One-way · R-32 | MMLD012S6S-1P | 216581321 | Yes · cold climate | 12,000 BTU/h | 10,500 BTU/h | 21.0 · 9.5 | -25 °C | $1,260 |
| M1WD 18,000One-way · R-32 | MMLD018S6S-1P | 215810023 | Yes · cold climate | 17,500 BTU/h | 16,000 BTU/h | 20.0 · 9.5 | -25 °C | $1,920 |
| M22A 9,0002 × 2 · R-410A | MPC009S4S-1P | 207683514 | Yes · cold climate | 9,000 BTU/h | 7,500 BTU/h | 20.0 · 10.0 | -25 °C | — |
| M22A 12,0002 × 2 · R-410A | MPC012S4S-1P | 207683515 | Yes | 11,800 BTU/h | 8,900 BTU/h | 22.7 · 9.9 | -25 °C | — |
| M22A 18,0002 × 2 · R-410A | MPC018S4S-1P | 207683516 | Yes | 16,000 BTU/h | 12,000 BTU/h | 20.5 · 10.4 | -25 °C | $600 |
| M33C 24,0003 × 3 · R-410A | MLB024S4S-1P | 207683534 | Yes · cold climate | 24,000 BTU/h | 21,000 BTU/h | 20.5 · 11.5 | -30 °C | $2,520 |
ENERGY STAR: dataset w7cv-9xjt updated Oct. 28, 2026, markets “United States, Canada”. Heats down to: outdoor unit documents (MMLD 211076, MPC 211038, MLB 211036). For R-410A units, the AHRI number is the ENERGY STAR registry’s, the same as on our product pages. LogisVert: indicative amounts from our product pages, calculated under guide v1.10; Hydro-Québec’s list last checked October 6, 2026; “—”: no amount on the page. Only Hydro-Québec confirms the assistance granted.
LogisVert residential participation guide, version 1.10, September 15, 2026. Our LogisVert page.
LENNOX certificates W900004-02 (Nov. 11, 2025) and EW900011-01 (Jan. 1, 2026).
The M22D does: LENNOX designs it for a single 24 × 24 in. (610 × 610 mm) ceiling tile opening. The M22A, on R-410A, needs a 23-5/8 in. (600 mm) opening. The 3 × 3 units, M33D and M33C, are larger than a tile: the grid gets modified.
Look at the one-way M1WD: 5-5/16 in. tall for the 12,000, per its LENNOX sheet. The M33C 24,000 is 8-1/8 in. and the M22A 10-3/8 in. We measure the actual space at the visit.
No. It is the indoor head of a system. The M22D, M33D and M1WD are installed with an MMLD outdoor unit of the same size; the M22A with an MPC; the M33C 24,000 with an MLB. The AHRI number, the efficiency and the heating range belong to the pair.
It depends on the outdoor unit. With the MMLD, LENNOX gives -13 °F (-25 °C); with the MPC of the M22A, -13 °F too; with the MLB of the M33C, -22 °F (-30 °C).
Not with a cassette. LENNOX supplies the wireless remote with wall units and floor consoles only; for the other heads it is optional. Plan for it on the quote.
The LogisVert guide (version 1.10, September 15, 2026) requires an ENERGY STAR certified system of at least 12,000 BTU/h nominal cooling. The systems table gives each product page’s indicative amount. Only Hydro-Québec confirms the assistance granted.
No. LENNOX certificate EW900011-01 names Québec among the places where registration is not required. The M22D, M33D and M1WD heads get 12 years on parts; the MMLD outdoor unit, 12 years on parts and on the compressor. LENNOX does not cover labour, and the extension stays with the original owner.
We look at the ceiling, the space above it and the room, tell you which format and which size, and the quote carries the full system: the head, the outdoor unit, the AHRI number and the indicative LogisVert amount when the system qualifies.
Hydro-Québec does not solicit anyone by phone or door to door for LogisVert. A call “from Hydro-Québec” selling a heat pump? Hang up.
LogisVert amounts are indicative: only Hydro-Québec confirms the assistance granted. Price on quote. Free in-home estimate.