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GOODMAN//Wall units

Goodman wall heat pumps: how far each series heats in January

Eight wall heat pumps, in two series. Series 19 runs from 12,000 to 36,000 BTU/h; GOODMAN publishes its heating down to -15 °C. Series 21 stops at 24,000 BTU/h; GOODMAN publishes its heating down to -25 °C. The thermometer on this page sets both limits against Montréal-Trudeau winters.

The question this page answersSeries 19 or Series 21: how far does each one heat, against a Montreal winter?

Request an on-site estimateOpen the January thermometer
-15 °Clowest published heating temperature, Series 19Source 1, p. 5
-25 °Clowest published heating temperature, Series 21Source 1, p. 6
-13.5 °Cnormal January daily minimum at Montréal-Trudeau, 1991-2020Source 4
36,000 BTU/hthe largest wall size, Series 19 onlySource 2, p. 5

The eight GOODMAN wall units we sell

Five Series 19 and three Series 21, all on R-410A. We price the job once we have seen the room and the wall.

8 models in our store

Tool//The January thermometer

The January thermometer: which series still heats?

Slide from -32 to 10 °C. For each series, the tool tells you whether the temperature falls inside the heating range GOODMAN publishes, and how many January days get that cold at Montréal-Trudeau on average.

The January thermometer, GOODMAN wall unitsSources 1, 2 and 4
-13.5 °C

At -13.5 °C outside

That is the normal January daily minimum at Montréal-Trudeau (1991-2020 normals).

Series 21
In range11.5 °C above its published limit of -25 °C
Series 19
In range1.5 °C above its published limit of -15 °C
January: days below -13.5 °C
6.7 to 20.7 days (AirGreen reading)daily minimum, 1991-2020 normals (code C)

Published heating range (to 30 °C, off scale)Chosen temperatureMontréal-Trudeau markers

Both series are inside their published range. Their heat output still drops as it gets colder.

Series 19, five sizesSeries 21, three sizes

Environment Canada markers, Montréal-Trudeau, 1991-2020 normals: -13.5 °C is the normal January daily minimum; the minimum drops below -20 °C on 6.7 January days on average (a code C count, less robust). -31.8 °C is an extreme: the lowest observed from 1991 to 2020, on January 27, 1994. No count is published below -15 or -25 °C. A published range tells you at which temperatures GOODMAN publishes heating, not how much heat comes out.

Montréal-Trudeau//Against January

January's normal minimum does not separate the two series; nights below -15 °C do

On average, 6.7 January days at Montréal-Trudeau have a minimum below -20 °C: on those nights, GOODMAN publishes heating for Series 21 only.

A typical January at Montréal-Trudeau

1991-2020 normals for January: a daily minimum of -13.5 °C, a daily mean of -9.2 °C and a daily maximum of -5.0 °C (source 4). All three fall inside the heating range GOODMAN publishes for Series 19 and for Series 21.

Between -15 and -25 °C, one series only

Below -15 °C, GOODMAN publishes no heating for Series 19; it publishes Series 21 heating down to -25 °C (source 1, p. 5 and 6). The choice of series plays out in that 10 °C gap.

The station record: -37.8 °C

Set on January 15, 1957, in Environment Canada's long 1941-2020 series (source 4). That is 12.8 °C below the last temperature at which GOODMAN publishes Series 21 heating (AirGreen calculation).

GOODMAN//Both series

What the two series share, and where they part ways

Same brochure, same feature table. Two differences matter first: the largest size and the lowest temperature at which GOODMAN publishes heating.

The same base

Both series use R-410A and 208-230 V single phase (source 1, p. 5 and 6). The 12,000 wall head has the same footprint, 31.6 × 7.5 × 11.7 in, in Series 19, in Series 21 and on the MSC123E19 air conditioner (source 1, p. 4 to 6).

On standby, 1 W instead of 5 W

For both series, GOODMAN checks off a standby mode that cuts consumption from 5 W to 1 W, louver position memory and automatic restart after a power failure (source 1, p. 3). The 06-21 revision no longer lists the standby line in its table (source 2, p. 3).

Above 24,000 BTU/h, Series 19 alone

Series 19 goes up to 30,000 and 36,000 BTU/h, with a 49.6 in head, the widest of the two series (source 1, p. 5 and 6).

Compare//Same capacity

Series 19 or Series 21, at 12,000 BTU/h

Same size, same outdoor unit footprint. Series 21 heats at lower temperatures and has the better SEER; Series 19 has the better COP and the better region V HSPF.

GOODMAN data, sources 1 and 2, p. 5 and 6

Series 19MSH123E19MCAA + MSH123E19AXAA
Series 21MSH123E21MCAA + MSH123E21AXAA
At 12,000 BTU/hSeries 19Series 21
SEER19.021.5
HSPF region IV / region V9.5 / 8.09.8 / 7.7
COP at 8.3 °C (47 °F)3.433.24
Heating published down to-15 °C-25 °C
Published maximum at -15 °Cnot published8,000 BTU/h
Outdoor unit, W × D × H31.5 × 13.1 × 21.8 in31.5 × 13.1 × 21.8 in
Outdoor unit sound55 dB(A)55 dB(A)
Minimum circuit ampacity / maximum fuse15 / 15 A12 / 15 A
Maximum line length / maximum lift82 / 33 ft82 / 33 ft

Series 21 sound: we use the 06-21 revision, as on the Series 21 page; the 03-21 brochure prints 40 dB(A), the 2018 document 57.5 (source 3, p. 10).

Did you know//GOODMAN documents

Three features GOODMAN checks off for both wall series

01

A refrigerant leak, flagged by the wall head

According to GOODMAN's feature table, the indoor unit can notify the homeowner of a leak in the system. The feature is checked for Series 19 and Series 21 alike.

Source 1, p. 3; source 2, p. 3
02

A cold catalyst filter

GOODMAN describes a "Cold Catalyst Filter" that absorbs harmful particles like formaldehyde and ammonia. The filter is checked for both series.

Source 1, p. 3
03

Indoor air preheat

GOODMAN checks an "Anti-Cold" feature for both series, which it describes as preheating indoor air for more comfort.

Source 1, p. 3; source 2, p. 3

AirGreen × GOODMAN//Who brings what

GOODMAN wall units, installed by AirGreen

GOODMANWhat GOODMAN brings

  • Two wall series on R-410A, from 12,000 to 36,000 BTU/h
  • A published heating range for each series, down to -15 or -25 °C
  • Cooling published up to 50 °C outdoors on both series
  • Remote control operation on both series

Questions//Wall units

Questions about GOODMAN wall units

Do I keep my baseboards with a GOODMAN wall unit?

We decide that at the estimate, house by house. Three facts weigh in. A heat pump's output drops as it gets colder; GOODMAN shows it for Series 21. GOODMAN publishes no heating below -15 °C for Series 19, or below -25 °C for Series 21. And a wall unit heats the room it is in first.

Where do the -15 and -25 °C come from?

From the operating temperature line of each GOODMAN table: -15 to 30 °C in heating for Series 19, -25 to 30 °C for Series 21, in the 03-21 brochure. The 06-21 revision gives the same ranges, and GOODMAN's 2018 French-language document confirms the Series 21 range.

What exactly is a normal?

An average computed by Environment Canada for the Montréal-Trudeau station over the 1991-2020 period: 28 complete years for temperatures, at least 20 for the day counts (code C). So the -13.5 °C figure is an average January minimum, not the coldest it gets. The -31.8 °C figure is not a normal: it is the lowest minimum observed from 1991 to 2020.

Can a GOODMAN wall unit be run from a wall thermostat?

In its 2021 brochures, GOODMAN gives a single control for the wall units of both series: the remote control. It lists no wall thermostat for them.

Can a GOODMAN wall heat pump run on 115 V?

No: the eight GOODMAN Series 19 and Series 21 wall heat pumps are 208-230 V single phase. In GOODMAN's ductless brochures, the only 115 V model is an air conditioner with no heating, the 12,000 MSC121E19, sold with our wall air conditioners.

Read next//The GOODMAN space

Related pages

The whole GOODMAN rangeFrom wall units to R-32 central systemsSeries 19Five sizes, from 12,000 to 36,000 BTU/hSeries 21Heat published at -8.3, -15 and -25 °CWall air conditionersThe same format, without heating
AirGreen

Series 19 or Series 21: the answer depends on your home

Three things decide: the size of the room, the nights the heat pump has to cover and the heating that will stay in place. We look at them together, on site, before we talk price.

Sold and installed by AirGreen.Montreal, Laval, Longueuil, the South Shore and the North Shore.

Request an on-site estimateCall 514 316-2973
Free on-site estimate

An AirGreen technician assesses the heating and cooling needs, where the units will go and the refrigerant line route on site before proposing a model.

RBQ licence 5645-9605-01

Subclasses 15.8, 15.10 and 16. Gas and oil work is done by a partner holding the required licence.

The equipment is GOODMAN-branded. AirGreen sells it, installs it and services it across Greater Montreal.

Sources

  1. GOODMAN, "Heat Pump and Air Conditioner Ductless Units", 19 Series and 21 Series, code CB-DL-1921S-HP 03-21, p. 3 to 6. GOODMAN document kept in AirGreen's files.
  2. GOODMAN, same brochure, revision CB-DL-1921S-HP 06-21, p. 3, 5 and 6.
  3. GOODMAN, French-language single and multi-zone ductless brochure, code CB-GDuctless2018-FR 10.18, p. 10.
  4. Environment and Climate Change Canada, Canadian Climate Normals 1991-2020, MONTREAL TRUDEAU (AIRPORT), page modified October 22, 2026, read November 5, 2026: January normals, days below -10, -20 and -30 °C, extremes of the 1991-2020 period and of the long 1941-2020 series. climate.weather.gc.ca

Read and dated by AirGreen. Capacities and limits are the ones GOODMAN publishes; a real installation can give other values.