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A −20 °C published limit, set against your winter

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ACD · Éclypse · SED series · 4 sizes

ACD Éclypse: a −20 °C published limit. How many days fall below it?

ACD’s Éclypse sheet, from 9,000 to 24,000 BTU, publishes a heating range of −20 to 24 °C. At Montréal-Trudeau, the daily low drops below −20 °C on 12.0 days a year on average. The counter below gives those days for December, January, February and the year, and what heats the house on those days.

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Updated November 5, 2026 · ACD Éclypse sheet and manual, ECCC 1991-2020 climate normals, NEEP and ENERGY STAR lists

ACD sheet · ECCC normals

The Éclypse against a Montréal-Trudeau winter

Normal January daily low−13.5 °C
Éclypse published limit−20 °C
January extreme minimum, 1991-2020−31.8 °C

Bars to scale, from 0 to −35 °C. Environment and Climate Change Canada 1991-2020 normals; the January extreme minimum dates from 1994. The Éclypse’s published heating range runs from −20 to 24 °C.

4Éclypse wall heat pumps in the shop
−20 °CÉclypse published heating limit, from 9,000 to 24,000 BTU
12.0days a year with a low below −20 °C at Montréal-Trudeau
1.3 / 6.7 / 3.4days below −20 °C in December, January and February (ECCC)

This page answers

Is a −20 °C published limit enough for my house in Montréal?

On this page

The ACD shop · Éclypse

The Éclypse units in the shop, right below

Éclypse 9,000, 12,000, 18,000 and 24,000 BTU, SED indoor units. Price on quotation.

01 · My days below −20 °C

On how many winter days does the low drop below the Éclypse’s published limit?

Pick a period and your current heating. The counter gives the average number of days when the low drops below −20 °C at Montréal-Trudeau, then what heats the house on those days.

Period

Your current heating

Days: average number of days with a low below −20 °C and below −10 °C, Environment and Climate Change Canada 1991-2020 climate normals, Montréal-Trudeau station. Limit: ACD Éclypse sheet and SED manual (INS576), p. 6. ACD publishes no Éclypse output in deep cold, and the Éclypse has no record on the NEEP list.

Your days below the published limit

6.7days in January below −20 °C

On average, per the 1991-2020 normals at Montréal-Trudeau. On those days the low drops below the Éclypse’s published heating limit (−20 °C).

Low below −20 °Coutside the Éclypse’s published heating range6.7 days of 31
Low below −10 °Cincludes the days above; from −10 to −20 °C the Éclypse is within its published range, but ACD publishes no output at these temperatures20.7 days of 31

In January, the low drops below the Éclypse’s published limit (−20 °C) on 6.7 days on average. Below −20 °C the Éclypse is outside its published range, and your electric baseboards take over. Our advice: keep them with the Éclypse; between −10 and −20 °C, ACD publishes no output.

Normal daily low in January: −13.5 °C. Source: Environment and Climate Change Canada, 1991-2020 normals.

02 · Éclypse or Commodore23

At 18,000 BTU: the Éclypse or the Commodore23, same footprint on the wall

At 18,000 BTU, ACD’s sheets give the Éclypse and Commodore23 indoor units the same dimensions: 38.2 × 11.8 × 8.8 in. Here is what changes.

ACD Éclypse sheet

Éclypse 18,000

Published heating limit−20 °C
Nominal heating18,000 BTU/h
SEER / HSPF16 / 9
Indoor unit, lowest sound level45 dB(A)
Outdoor unit, sound57 dB(A)
Indoor unit (W × H × D)38.2 × 11.8 × 8.8 in

AHRI certificate 201863352 · ACD sheet

Commodore23 18,000

Published heating limit−25 °C
Nominal heating19,800 BTU/h
SEER / HSPF20 / 10.5
Indoor unit, lowest sound level39 dB(A)
Outdoor unit, sound55 dB(A)
Indoor unit (W × H × D)38.2 × 11.8 × 8.8 in
The Commodore23 page

Same dimensions, not the same unit: the Éclypse 18,000 indoor unit weighs 31 lb and moves 471 CFM at most, the Commodore23 18,000 indoor unit 27.6 lb and 559 CFM. The Commodore23 18,000 publishes a lower limit (−25 against −20 °C), a better SEER (20 per its AHRI certificate, against 16 for the Éclypse 18,000 per its sheet) and a quieter indoor unit at its lowest (39 against 45 dB(A)). Neither is on the ENERGY STAR list read on November 5, 2026.

The four Éclypse units, size by size

The four Éclypse sizes per the ACD sheet
SizeIndoor unit, W × H × DNominal heatingSEER / HSPFIndoor sound, min / maxOutdoor soundProduct page
Éclypse 9,000SED09KCH17S31.1 × 10.8 × 7.9 in9,500 BTU/h17 / 936 / 49 dB(A)55 dB(A)See the Éclypse 9,000
Éclypse 12,000SED12KCH17S33.3 × 11.4 × 8.2 in13,000 BTU/h17 / 938 / 52 dB(A)56 dB(A)See the Éclypse 12,000
Éclypse 18,000SED18KCH16S38.2 × 11.8 × 8.8 in18,000 BTU/h16 / 945 / 57 dB(A)57 dB(A)See the Éclypse 18,000
Éclypse 24,000SED24KCH19S42.4 × 12.8 × 9.7 in24,000 BTU/h19 / 1047 / 59 dB(A)59 dB(A)See the Éclypse 24,000

ACD Éclypse technical sheet (FR and EN). SEER and HSPF as printed on the sheet (not SEER2 or HSPF2); the sheet does not print the conditions of the nominal heating figure. Dimensions in inches, as on the sheet.

03 · Did you know

Three details on the Éclypse, from ACD’s sheets

19

The Éclypse 24,000 has the best published efficiency in the series

Per the ACD sheet, the Éclypse 24,000 shows a SEER of 19 and an HSPF of 10; the Éclypse 9,000, 12,000 and 18,000 show a SEER of 16 to 17 and an HSPF of 9.

ACD Éclypse sheet

79 cm

The Éclypse 9,000 is the narrowest ACD wall unit

Per ACD’s sheets, the Éclypse 9,000 indoor unit is 31.1 in (79 cm) wide, against 33.4 in for the Commodore23 9,000 and 39.2 in for the Révolution 9,000.

ACD Éclypse, Commodore23 and Révolution sheets

63.9 lb

The Éclypse 9,000 has the lightest outdoor unit of the ACD wall range

The Éclypse 9,000 outdoor unit weighs 63.9 lb (29 kg) net per its sheet, against 78 lb for the Commodore23 9,000 and 99.2 lb for the Révolution 9,000.

ACD Éclypse, Commodore23 and Révolution sheets

04 · Questions

Your questions about the ACD Éclypse

Does the Éclypse heat below −20 °C?

ACD publishes a heating range of −20 to 24 °C for the Éclypse, on the sheet and in the SED manual (INS576). Below −20 °C, ACD publishes nothing on the Éclypse. At Montréal-Trudeau, the daily low drops below −20 °C on 12.0 days a year on average, 6.7 of them in January (1991-2020 normals).

ACD Éclypse sheet; SED manual (INS576), p. 6; ECCC, 1991-2020 normals
How much heat does the Éclypse give in deep cold?

ACD publishes no Éclypse output in deep cold, and none of the four Éclypse units has a record on the NEEP cold-climate heat pump list (read on November 5, 2026). The sheet gives the nominal heating: 9,500, 13,000, 18,000 and 24,000 BTU/h by size, without printing the conditions.

ACD Éclypse sheet; NEEP list, November 5, 2026
Is the Éclypse eligible for LogisVert?

No, under the rule in force since November 26, 2025: Hydro-Québec only accepts ENERGY STAR heat pumps, and none of the four Éclypse units is on the ENERGY STAR list read on November 5, 2026.

ENERGY STAR list, November 5, 2026; Hydro-Québec notice on the November 26, 2025 list update (ENERGY STAR only)
How much wall space does an Éclypse take?

Per the ACD sheet, the Éclypse indoor unit runs from 31.1 in wide on the 9,000 to 42.4 in on the 24,000, with a net weight of 21 lb (9.5 kg) to 37 lb (16.8 kg); the four-size table gives all three dimensions.

ACD Éclypse sheet
Which Éclypse size should I choose?

For the Éclypse, the size is chosen at the on-site assessment of your heating needs, taking the heating already in place into account. It comes in 9,000, 12,000, 18,000 and 24,000 BTU, from the SED09KCH17S to the SED24KCH19S.

AirGreen · Heating and cooling

Below −20 °C, what heats the house? We work it out with you, at your home

We assess your heating needs on site, along with the heating already in place (baseboards or furnace) and where the Éclypse would go, then send you the quote. The estimate is free.

Book my free home estimate 514 316-2973
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Sold and installed by AirGreen.Montréal, Laval, Longueuil, the South Shore and the North Shore
Free estimateAt home, no obligation
Showroom1370 Joliot-Curie Street, Suite 712, Boucherville

Sources checked on November 5, 2026

  • ACD Éclypse technical sheet (FR and EN, no date printed): SED models, nominal heating, SEER, HSPF, sound levels, dimensions, weights and airflow, heating range of −20 to 24 °C.
  • ACD Éclypse SED user manual (INS576): operating range (p. 6).
  • Environment and Climate Change Canada, 1991-2020 normals, Montréal-Trudeau: days with a low below −20 °C and below −10 °C, normal daily lows, January extreme minimum (1994).
  • NEEP cold-climate heat pump list (ashp.neep.org) and ENERGY STAR list of certified air-source heat pumps, Canadian market (energystar.gov), read on November 5, 2026: no record for the four Éclypse units.
  • Hydro-Québec, LogisVert: Hydro-Québec notice on the November 26, 2025 list update (ENERGY STAR only) and residential participation guide, version 1.10: hydroquebec.com.
  • ACD Commodore23 technical sheet (FR and EN, no date printed) and AHRI certificate 201863352 (Commodore23 18,000), for the comparison at 18,000 BTU and the Commodore23 9,000 width and weight.
  • ACD Révolution technical sheet (FR and EN, no date printed): width and weight of the Révolution 9,000.

Price on quotation; free home estimate.