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AirGreen × TOSOT · Sold and installed by AirGreenTOSOT cassettes at AirGreenThree ceiling sizes, from 12,000 to 24,000 BTU/h, on a multi-zone compressor.
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TOSOT · Cassettes · updated November 5, 2026

TOSOT cassettes: ceiling size, weight and sound

Three four-way cassettes. The 12,000 and 18,000 share the same 23 1/2 in. body and the same weight; the 24,000 goes up to 33 in. and 57 lb. Every figure comes from the TOSOT sheet for that size.

Compare the three sizesBook my free estimate
  • 3TOSOT cassettes online
  • 9 1/2 in.body height, all three sizes
  • 34–44 dB(A)the 12,000, minimum and maximum in its sheet
  • 7fan speeds
01 · In the ceiling

Pick the size and what you want to see

The three TOSOT cassettes, from their technical sheets online on November 5, 2026: what goes into the ceiling, what you hear in the room and what must be connected.

Size · BTU/h

What you want to see

TM18HBKD-I: 23 1/2 × 23 1/2 × 9 1/2 in. body, 44 lb net.

18,000 BTU/hTM18HBKD-I
23 1/2 in.body seen from below, to scale
Solid: the size you picked. Dashed: the other sizes. The decorative panel is larger than the body; its dimensions are on the TOSOT sheet drawing.
Body (W × D × H)
23 1/2 × 23 1/2 × 9 1/2 in.
Net / gross weight
44 / 53 lb
Discharge
Four-way
Height in the ceiling
9 1/2 in.body only, all three sizes

TOSOT sheet TM18HBKDI+TW18HXP2A1DO, file of January 19, 2026, read on November 5, 2026.

Indoor-unit values only. TOSOT’s cassette and ducted sheets also give an output and an AHRI number with a single-zone outdoor unit; AirGreen connects these heads to a multi-zone compressor, so those figures do not apply and are not used here.

AirGreen × TOSOT

TOSOT cassettes, live

Each product page: indoor model, dimensions and technical details.
02 · Did you know

Three things to know before choosing

01

Same body for the 12,000 and 18,000

Both cassettes measure 23 1/2 × 23 1/2 × 9 1/2 in. and weigh 44 lb. What changes: maximum airflow, 383 CFM against 418, and the gas line, 3/8 in. against 1/2 in.

TOSOT sheets TM12HBKDI and TM18HBKDI.

02

Bigger does not mean quieter

Per the TOSOT sheets, the 24,000 runs from 36 to 47 dB(A) and the 12,000 from 34 to 44 dB(A). The largest cassette is not the quietest.

TOSOT sheets TM24HBKDI and TM12HBKDI.

03

The 24,000 size on a 42,000

On the 42,000 BTU/h multi-zone compressors, the TOSOT brochure keeps the 24,000 head for cassettes, ducted units and floor-ceiling units, not wall units.

TOSOT Bathica “Heat Pumps” brochure, undated.

03 · Side by side

The three cassettes, side by side

Indoor-unit values, as TOSOT prints them.

SizeBodyNet weightMax. airflowSound (min. to max.)Lines
12,000TM12HBKD-I23 1/2 × 23 1/2 × 9 1/2 in.44 lb383 CFM34–44 dB(A)1/4 – 3/8 in.
18,000TM18HBKD-I23 1/2 × 23 1/2 × 9 1/2 in.44 lb418 CFM35–47 dB(A)1/4 – 1/2 in.
24,000TM24HBKD-I33 × 33 × 9 1/2 in.57 lb753 CFM36–47 dB(A)3/8 – 5/8 in.

Body: width × depth × height. Sound: minimum and maximum in the sheet, no per-speed detail. TOSOT sheets read on November 5, 2026.

04 · Multi-zone heads

The other heads, each with its question

R-410ADuctedLow or high static, in figures.R-410AFloor consolesThe room it takes under a window.R-410AFloor-ceilingOne unit, on the floor or on the ceiling.TOSOTBuild a multi-zoneThe compressors these heads connect to, from 2 to 5 rooms.
AirGreen × TOSOT

The right model is chosen at your place, not on a grid

We look at the room, the insulation and the electrical panel, then we propose the model, the quote and the LogisVert amount that applies.

Book my free estimate514 316-2973
  • Sold and installed by AirGreenMontreal, Laval, Longueuil, South Shore and North Shore.
  • RBQ 5645-9605-01Subclasses 15.8 Ventilation, 15.10 Refrigeration and 16 Electricity.
  • LogisVertHydro-Québec never solicits by phone or door to door for LogisVert.
Sources

Sources and reading dates

  1. TOSOT, submittals TM12HBKDI+TW12HXP2A1DO (file of March 7, 2025), TM18HBKDI+TW18HXP2A1DO (January 19, 2026) and TM24HBKDI+TW24HXP2A1DO (March 7, 2025), tosot.com, read on November 5, 2026; none carries a printed date.
  2. TOSOT Bathica, “Heat Pumps” brochure (tosotamerica.com), undated, read on November 5, 2026: note “24K size is reserved for ceiling cassettes, concealed ducts, and floor/ceiling units only”.

Indoor-unit values only. TOSOT’s cassette and ducted sheets also give an output and an AHRI number with a single-zone outdoor unit; AirGreen connects these heads to a multi-zone compressor, so those figures do not apply and are not used here.