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LENNOX publishes a heating range of -5 to 75 °F for the MWPD, i.e. -20.6 to 24 °C. At Montréal-Trudeau, about 12 nights a year drop below -20 °C, 6.7 of them in January on average. Down to its limit, the 12,000 still gives 12,100 BTU/h in the LENNOX table; its certified rating at -15 °C is 9,000 BTU/h. We show you, month by month, when your backup heat takes over.
From 9,000 to 24,000 BTU/h, all with the MWMD head. Each product page gives the AHRI number and the indicative LogisVert amount.
The nights come from the Montréal-Trudeau climate normals. The heat comes from the LENNOX technical table (form 211081) and the certified rating. Pick the month, the heating already in place and the size.
Nights: days whose minimum drops below -20 °C, Environment Canada, 1991-2020 normals. No -20.6 °C threshold is published: these numbers are a ceiling. Heat: LENNOX table at 21 °C indoors, compressor speed not stated; certified rating at 5 °F (-15 °C) from the NEEP registry.
On average, out of 31 nights (1991-2020 normals). It is a ceiling: Environment Canada counts nights below -20 °C, and the MWPD range goes down to -20.6 °C.
Over the year: about 12 nights below -20 °C, almost all from December to March.
Below -20.6 °C you are outside the heating range LENNOX publishes for the MWPD: on those nights you count on your baseboards. In January, that is at most 6.7 nights on average.
The other nights of the month stay above -20 °C, inside its range.
The LENNOX table does not state the compressor speed. At the visit, we start from the certified rating.
The MWHD is the LENNOX standard-efficiency R-32 wall unit, with its own head. Same heating range; but at the same size, the MWPD keeps more heat at -15 °C and at -20.6 °C, and it has two more years of LENNOX warranty.
Pink rows are the differences. * For an installation on or after November 11, 2025 (EW900011-01). LENNOX forms 211081 (Dec. 2025) and 211079 (Aug. 2026); certified ratings: registries read Oct. 28, 2026, see the sources.
The LENNOX installation manual lists them side by side, with the same MWMD heads from the 9,000 to the 24,000. Same head, same certified ratings at the same size: what changes is the outdoor unit.
LENNOX, installation manual (December 2024), p. 9; forms 211080 and 211081.In the LENNOX sheets, the 15,000, 18,000 and 24,000 MWPD give exactly the same heat as the MWLD of the same size, from -20.6 to 24 °C. Only the 9,000 and the 12,000 differ a little: at -20.6 °C, 12,100 BTU/h for the 12,000 MWPD against 12,300 BTU/h for the MWLD.
LENNOX, forms 211080 and 211081, p. 14-18.The MWPD cooling range starts at 14 °F (-10 °C); the MWLD’s, at 0 °F (-18 °C). The difference only matters if a room has to be cooled in the middle of winter.
LENNOX, form 211081, p. 10-11; form 211080, p. 9-10.Amounts from our product pages, matching Hydro-Québec’s list at our last check (list of October 6, 2026). Under each MWPD, the amount of the MWHD of the same size. These are indicative amounts. Only Hydro-Québec confirms the assistance granted.
LogisVert residential participation guide, version 1.10, September 15, 2026. Our LogisVert page.
LENNOX form 211081 (Dec. 2025). Sound is the outdoor unit in cooling mode; LENNOX does not publish heating sound.
| Size | AHRI | SEER2 · HSPF2 | Outdoor sound | Max. piping | Max. height | Liquid · gas | MCA / MOCP | Factory charge |
|---|---|---|---|---|---|---|---|---|
| 9,000 | 216411310 | 25 · 10.5 | 45 dB(A) | 66 ft | 49 ft | 1/4 · 3/8 in. | 12 / 20 A | 2 lb 2 oz |
| 12,000 | 216411311 | 24 · 10.5 | 46 dB(A) | 66 ft | 49 ft | 1/4 · 3/8 in. | 12.5 / 20 A | 2 lb 2 oz |
| 15,000 | 216411312 | 23 · 11 | 48 dB(A) | 98 ft | 66 ft | 1/4 · 1/2 in. | 21 / 30 A | 3 lb 5 oz |
| 18,000 | 216411313 | 21 · 9.7 | 51 dB(A) | 98 ft | 66 ft | 1/4 · 1/2 in. | 21 / 30 A | 4 lb 7 oz |
| 24,000 | 216411314 | 20 · 9.5 | 54 dB(A) | 98 ft | 66 ft | 1/4 · 5/8 in. | 21 / 30 A | 4 lb 7 oz |
Minimum line: 9.8 ft. Factory charge covers 24.6 ft of line; beyond that, 0.16 oz of R-32 per foot (LENNOX installation manual, December 2024).
LENNOX, submittal sheet 496371, December 2024 (MWPD018S6S-1P + MWMD018S6-1P).
For almost all of winter, yes. At Montréal-Trudeau, about 12 nights a year drop below -20 °C (1991-2020 normals), 6.7 of them in January on average. On those nights you are outside the range LENNOX publishes for the MWPD: keep a backup heat source, baseboards or a furnace.
LENNOX publishes a heating range of -5 to 75 °F (-20.6 to 24 °C) and a heat table that stops at -5 °F. Below that, LENNOX gives no figure. So we don’t count on it on those nights, and we plan the backup.
LENNOX publishes the limit in Fahrenheit: -5 °F. Converted, that is -20.6 °C, the figure LENNOX also prints on the 18,000 MWPD submittal sheet. That is the one we keep.
Look at the MWLD: LENNOX gives it a heating range down to -30 °C. At Montréal-Trudeau, a night below -30 °C comes about once every five years (0.21 a year).
The LENNOX MWPD sheet does not mention one, and its NEEP record declares none. If ice in the base of the outdoor unit worries you, the MWLD is the one that has it.
The LENNOX EW900011-01 extended warranty gives the MWPD 12 years on parts and 12 years on the compressor in total, with no registration in Québec. It stays with the original owner. Labour is not covered by LENNOX.
Yes. The MWMD head has built-in Wi-Fi and comes with its wireless remote. LENNOX also offers wired wall controls (VSTAT02P-1 touchscreen or VSTAT04P-1 programmable, with the VSTAT06P-1 board) and a 24 V thermostat adaptor (VSTAT09P-1). We see at the visit what suits your home.
That gets decided at your place, not over the phone. We look at the room, the insulation, the windows and the heating already in place, then we suggest the size. The estimate is free.
We come and see the room and the heating already in place, choose the size with you and give you a clear quote, with the AHRI number and the indicative LogisVert amount when the unit 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.