GOODMAN · Series 19 · Series 21 · GLZS4B · GLZS4MThe GOODMAN space at AirGreenSold and installed by AirGreen. Montreal, Laval, Longueuil, the South Shore and the North Shore.

GOODMAN//Central systems

Goodman central heat pump: R-410A in store, R-32 heat down to -17.8 °C

To replace a central system, our store carries four Goodman R-410A series. The R-32 GLZS4B and GLZS4M are coming soon: their August 2026 GOODMAN sheets give, size by size, the matched AMST air handler and the heat left at -17.8 °C.

The question this page answersReplacing a central system: which Goodman pair, and how much heat is left at -17.8 °C?

Request an on-site estimate See the R-32 pair

22R-410A central units in this collection, all quoted on request; only one series has a GOODMAN documentAirGreen store, November 11, 2026; sources 3 and 4

1.58 to 1.94published COP at -17.8 °C across the eleven R-32 pairsSource 1, p. 18-19; source 2, p. 12

1.5 to 5 tonsGLZS4B in seven sizes; the GLZS4M stops at 3 tonsSources 1 and 2, p. 1

33 to 44%of the 8.3 °C heat is left at -17.8 °C, depending on the R-32 pair (AirGreen calculation)Source 1, p. 18-19; source 2, p. 12

R-410A central units in our store

From 1.5 to 5 tons: the GSZ14 and GSZ16 in seven sizes, the GSZC18 and GVZC20 in four. The SEER figures in the titles (14, 16, 18 and 20) are our store's; what GOODMAN documents for each series is in the table further down. The R-32 GLZS4 pair is covered in the tool below.

22 models in our store

Tool//The R-32 pair

The R-32 pair: outdoor unit, AMST air handler and cold-weather heat

Pick the series and the size. The tool gives the AMST air handler GOODMAN publishes with each outdoor unit, the heat at 8.3, -8.3 and -17.8 °C, and what the circuit needs.

The R-32 pair, GLZS4B and GLZS4MSource 1, p. 3 and 18-19; source 2, p. 3 and 12; source 7, p. 2

R-32 series

Size (tons) The GLZS4M stops at 3 tons.

GLZS4BA3610 + AMST36CU1300

AMST C cabinet, 21.0 in wide

Heat at -17.8 °C (0 °F): 14,350 BTU/h
COP at -17.8 °C: 1.86
Left at -17.8 °C: 42%AirGreen calculation: heat at -17.8 °C ÷ heat at 8.3 °C
Sound (dB, as printed): 75
Min. circuit ampacity / max. fuse: 21.5 / 35 A
Equipment weight: 196 lb

8.3 °C (47 °F)34,400 BTU/h

-8.3 °C (17 °F)21,600 BTU/h

-17.8 °C (0 °F)14,350 BTU/h

Published heat, GOODMAN heating table, at nominal airflow

Last published point: -17.8 °C. Below it, GOODMAN gives no figure for the GLZS4; an HKTS heater kit in the AMST air handler provides backup heat, sized on site.

See the GLZS4BA3610 product

Heat as GOODMAN publishes it at nominal airflow, with 21.1 °C (70 °F) indoors. All three bars come from the same heating table and read against the heat at 8.3 °C. Sound: printed as "Decibels", no weighting or test condition given.

GOODMAN//The R-410A grid

Four R-410A series: what GOODMAN documents

The four series in the grid
Series	Sizes in our store	GOODMAN document found	What the document claims
GSZ14	1.5 to 5 tons, seven sizes	Brochure CB-GSZ14 08-20 (source 3)	Up to 15 SEER and up to 9.0 HSPF, on R-410A
GSZ16	1.5 to 5 tons, seven sizes	—	—
GSZC18	2, 3, 4 and 5 tons	—	—
GVZC20	2, 3, 4 and 5 tons	—	—

What the GSZ14 brochure describes

Factory-installed: a bi-flow filter drier on the liquid line, a suction line accumulator and a heater band. The outdoor fan runs at a single speed, with a three-blade fan (source 3, p. 3).

The brochure, dated 2020, says nothing about the compressor, sound levels or electrical data.

Three series without a spec sheet

For the GSZ16, GSZC18 and GVZC20, we found no GOODMAN document: not on its website, in its literature library, its line card or its catalogue, all checked on November 5, 2026 (source 4).

So we quote no figure for these three series. Their data comes with the quote, model by model.

GOODMAN//R-32 specifications

The eleven R-32 outdoor units, line by line

What the GLZS4B and GLZS4M sheets add to the tool: refrigerant charge, refrigerant lines, footprint and weight.

GOODMAN data, sources 1 and 2

GLZS4B and GLZS4M, outdoor unit
Outdoor unit	R-32 charge	Refrigerant lines, liquid / suction	Suction valve	W × D × H	Shipping weight
GLZS4BA1810	70 oz	⅜ / ¾ in	¾ in	29 × 29 × 32½ in	165 lb
GLZS4BA2410	70 oz	⅜ / ¾ in	¾ in	29 × 29 × 32½ in	165 lb
GLZS4BA3010	81 oz	⅜ / ¾ in	¾ in	29 × 29 × 39½ in	190 lb
GLZS4BA3610	83 oz	⅜ / ⅞ in	⅞ in	35½ × 35½ × 35¾ in	211 lb
GLZS4BA4210	139 oz	⅜ / 1⅛ in	⅞ in	35½ × 35½ × 35¾ in	277 lb
GLZS4BA4810	174 oz	⅜ / 1⅛ in	⅞ in	35½ × 35½ × 36½ in	284 lb
GLZS4BA6010	194 oz	⅜ / 1⅛ in	⅞ in	35½ × 35½ × 41¾ in	320 lb
GLZS4MA1810	71 oz	⅜ / ¾ in	¾ in	29 × 29 × 32½ in	175 lb
GLZS4MA2410	70 oz	⅜ / ¾ in	¾ in	29 × 29 × 32½ in	175 lb
GLZS4MA3010	78 oz	⅜ / ¾ in	¾ in	29 × 29 × 39½ in	189 lb
GLZS4MA3610	83 oz	⅜ / ⅞ in	⅞ in	35½ × 35½ × 35 11/16 in	228 lb

The factory charge covers 15 ft of refrigerant lines; GOODMAN asks for it to be adjusted following the final charge procedure in its installation instructions. On the 3.5, 4 and 5-ton GLZS4B, the suction line goes up to 1⅛ in while the valve stays at ⅞ in: GOODMAN asks the installer to supply the adapters (source 1, p. 1 and 3).

Compare//Same capacity

GLZS4B or GLZS4M, at 3 tons

At 3 tons, GOODMAN publishes both series with the same air handler, the AMST36CU. The figures track each other closely; the gap shows in the cold and on the scale.

GLZS4BGLZS4BA3610 + AMST36CU1300

GLZS4MGLZS4MA3610 + AMST36CU1300

At 3 tons	GLZS4B	GLZS4M
Compressor	scroll, single-stage	scroll, single-stage
Heat at 8.3 °C (47 °F)	34,400 BTU/h	35,000 BTU/h
Heat at -8.3 °C (17 °F)	21,600 BTU/h	21,600 BTU/h
Heat at -17.8 °C (0 °F)	14,350 BTU/h	14,010 BTU/h
COP at -17.8 °C	1.86	1.71
Sound (dB, as printed)	75	74
Equipment weight	196 lb	208 lb
W × D × H	35½ × 35½ × 35¾ in	35½ × 35½ × 35 11/16 in
R-32 charge	83 oz	83 oz
Min. circuit ampacity / max. fuse	21.5 / 35 A	21.5 / 35 A

Sources 1 and 2, p. 3, 12, 15, 18-19 and 21. The two sheets print a different height for a cabinet of the same width: 35¾ in for the B, 35 11/16 in for the M. We quote each as printed.

Did you know//GOODMAN R-32 sheets

Amps, compressor, expansion valve: three lines from the R-32 sheets

More tons, fewer amps

The 3.5-ton GLZS4B asks less of the electrical panel than the 3-ton: a minimum circuit ampacity of 19.3 A and a 30 A maximum fuse, versus 21.5 A and 35 A. It is the only size in either series that needs less than the size below it.

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

Rotary up to 2.5 tons

The GLZS4B uses a rotary compressor from 1.5 to 2.5 tons, then a scroll from 3 to 5 tons. The GLZS4M is scroll in all four sizes.

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

The expansion valve follows the outdoor unit

For the GLZS4B, GOODMAN requires a specific TXV kit on the indoor coil, and states in capitals that the TXV is determined by the outdoor unit, not by the indoor coil. The AMST air handler already has a built-in TXV; the GLZS4B sheet does not say whether it must be swapped.

Source 1, p. 3; source 7, p. 1

AirGreen × GOODMAN//Who brings what

Goodman central system: GOODMAN's data, AirGreen's installation

What GOODMAN brings

Two single-stage R-32 series: GLZS4B from 1.5 to 5 tons, GLZS4M from 1.5 to 3 tons
For each R-32 outdoor unit, the AMST air handler its data is published with
Published heat and COP down to -17.8 °C, size by size
The OT18-60A outdoor thermostat, required below -17.8 °C

What AirGreen brings

Installation by our refrigeration technicians, under AirGreen's RBQ licence 5645-9605-01
Connecting the refrigerant lines and adjusting the charge to their actual length
Choosing the HKTS heater kit from the heating needs assessed on site
A survey of your current system, nameplate included, before we quote

Questions//Central systems

Questions about Goodman central systems

Can I buy a GLZS4B or a GLZS4M?

Not for now. Their product pages are online with the status "Coming soon", outside this collection's grid, which shows the R-410A models only. GOODMAN already publishes their spec sheets, dated August 2026.

Does a Goodman central system, R-410A or R-32, qualify for LogisVert?

No, neither on R-410A nor on R-32. For a heat pump installed on or after November 26, 2025, Hydro-Québec requires ENERGY STAR certification. Read on November 5, 2026, the ENERGY STAR list holds no GSZ14, GSZ16, GSZC18, GVZC20, GLZS4B or GLZS4M.

Can I keep my current air handler with a GLZS4?

In its spec sheets, GOODMAN publishes each GLZS4B and GLZS4M with one specific AMST air handler only; its other AHRI-rated combinations are gathered in its "System Configurator", which we did not consult. What can stay in place is checked on site.

GLZS4B or GLZS4M: which one?

GOODMAN calls them "Standard" and "Multi-Family". The GLZS4M stops at 3 tons. At every shared size the M sheet prints a lower sound figure: 69 versus 74 dB at 1.5 and 2 tons, 71 versus 77 at 2.5, 74 versus 75 at 3; neither sheet gives the test condition. At 2 tons, GOODMAN publishes the same heat for both at -17.8 °C: 7,900 BTU/h.

What circuit and breaker does a GLZS4 need?

208/230 V single-phase, between 197 and 253 V. Depending on size, the minimum circuit ampacity runs from 11.2 to 31.1 A and the maximum fuse from 15 to 50 A. GOODMAN requires time-delay fuses or HACR-type breakers of the size given in its GLZS4B and GLZS4M sheets.

Air handler, thermostat, or a packaged unit instead

The whole GOODMAN rangeEvery GOODMAN family, from wall units to central systems Furnaces and air handlersThe AMST air handler, its width and its heater kit Packaged unitsEverything in one outdoor cabinet, horizontal or downflow GTST thermostatThe GTST connected thermostat

A Goodman central system in your home: we start with what you already have

We start from the air handler or furnace already in place and the spot planned for the outdoor unit. The series, the size and the backup heat for the coldest days come next.

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

Request an on-site estimate Call 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

GOODMAN, "GLZS4B Energy-Efficient Standard Family R-32 Split System Heat Pump", spec sheet SS-GLZS4B-R32, 08/26 (supersedes 07/26), p. 1, 3, 4 to 21 and 24, read November 5, 2026. goodmanmfg.com
GOODMAN, "GLZS4M Energy-Efficient Multi-Family R-32 Split System Heat Pump", spec sheet SS-GLZS4M-R32, 8/26 (supersedes 10/24), p. 1, 3, 4 to 15 and 17, read November 5, 2026. goodmanmfg.com
GOODMAN, brochure "Energy-Efficient GSZ14 Heat Pump", code CB-GSZ14 08-20, p. 1 and 3. GOODMAN document kept in AirGreen's files.
GOODMAN, goodmanmfg.com: heat pump listing, literature library (183 PDFs), line card PM-GLINE 09-26 and catalogue CT-GOODMAN 03-26, checked November 5, 2026: no GSZ16, GSZC18 or GVZC20 document.
ENERGY STAR, certified heat pumps (dataset w7cv-9xjt), Canadian market, read November 5, 2026: no GSZ14, GSZ16, GSZC18, GVZC20, GLZS4B or GLZS4M system. energystar.gov
Hydro-Québec, "LogisVert Efficient Homes Program – ENERGY STAR® Heat Pump", partner notice of September 25, 2025 (required from November 26, 2025). hydroquebec.com
GOODMAN, "AMST Multi-Position, Multi-Speed, ECM-Based Air Handler with Internal TXV", spec sheet SS-GAMST-R32, 12/24A (supersedes 12/24), p. 1 and 2, read November 5, 2026. goodmanmfg.com

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

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