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AirGreen × TOSOT · Sold and installed by AirGreenThe LomoPlus UltraHeat tri-zone at AirGreenThree rooms on a 24,000, 36,000 or 42,000 BTU/h LomoPlus UltraHeat compressor.
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TOSOT · Multi-zone · UltraHeat tri-zone · updated November 5, 2026

UltraHeat tri-zone: the head trios TOSOT accepts

With the head sizes AirGreen offers, the 24,000 compressor takes 2 trios, the 36,000 takes 10, the 42,000 takes 13. Pick your three heads.

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  • 3UltraHeat tri-zone compressors online
  • 2 · 10 · 13trios allowed on the 24,000, 36,000 and 42,000
  • 54,000 BTU/hof heads at most, on the 42,000 (three 18,000 heads)
  • $3,600LogisVert for the 42,000 (list of October 7, 2026)
01 · Allowed heads

Pick your three heads: which UltraHeat compressors take them?

TOSOT’s sheet of November 4, 2024 lists the trios allowed on each compressor. Pick the head for each room.

Room 1 · BTU/h

Room 2 · BTU/h

Room 3 · BTU/h

Your heads: 9,000 + 12,000 + 12,000 = 33,000 BTU/h. 2 of 3 compressors accept it.

  1. ListedLomoPlus UltraHeat · 36,000TM36H5O · list in the TOSOT sheet of November 4, 2024Heads 33,000 BTU/h ÷ compressor 36,000 BTU/h = 92% (within TOSOT’s recommended range, 50 to 130%).
  2. ListedLomoPlus UltraHeat · 42,000TM42H5O · list in the TOSOT sheet of November 4, 2024Heads 33,000 BTU/h ÷ compressor 42,000 BTU/h = 79% (within TOSOT’s recommended range, 50 to 130%).
  3. Not listedLomoPlus UltraHeat · 24,000TM24H5O · list in the TOSOT sheet of November 4, 2024Not on its list: it takes 2 combinations of three heads.

LomoPlus UltraHeat: combination table in the TOSOT sheet of November 4, 2024, limited to the head sizes AirGreen offers (9,000 to 24,000 BTU/h); the ratio compares the sum of the heads with the compressor size, as TOSOT’s note does. Lomo 23: combination tables in the TOSOT sheets read on October 28, 2026, system output at AHRI test conditions (95 °F cooling, 47 °F heating). The final choice is made on site.

AirGreen × TOSOT

TOSOT LomoPlus UltraHeat tri-zone units, live

Each product page: outdoor model, AHRI number and the heads offered.
02 · Did you know

Three things TOSOT’s list says about trios

01

The 24,000: only two trios

With the sizes AirGreen offers, the 24,000 compressor takes only 9,000 + 9,000 + 9,000 and 9,000 + 9,000 + 12,000.

TOSOT sheet TM24H5O, combination table (November 4, 2024).

02

Three 18,000s on the 42,000

The 42,000 compressor takes three 18,000 heads: 54,000 BTU/h of heads, 129% of the compressor, within TOSOT’s recommended range, close to its 130% limit.

TOSOT sheet TM42H5O (November 4, 2024).

03

A list, not an output

The sheet of November 4, 2024 says which combinations are allowed, with no output per combination. What each room gets depends on which heads run at the same time: that is what we assess on site.

TOSOT sheets TM24H5O, TM36H5O and TM42H5O.

03 · Side by side

The 13 allowed trios, compressor by compressor

Each cell gives the heads ÷ compressor ratio; —: trio not on that compressor’s list.

Head trio (BTU/h)24,00036,00042,000
9,000 + 9,000 + 9,000 · 27,000113%75%64%
9,000 + 9,000 + 12,000 · 30,000125%83%71%
9,000 + 12,000 + 12,000 · 33,000—92%79%
9,000 + 9,000 + 18,000 · 36,000—100%86%
12,000 + 12,000 + 12,000 · 36,000—100%86%
9,000 + 12,000 + 18,000 · 39,000—108%93%
9,000 + 9,000 + 24,000 · 42,000—117%100%
12,000 + 12,000 + 18,000 · 42,000—117%100%
9,000 + 12,000 + 24,000 · 45,000—125%107%
9,000 + 18,000 + 18,000 · 45,000—125%107%
12,000 + 18,000 + 18,000 · 48,000——114%
9,000 + 18,000 + 24,000 · 51,000——121%
18,000 + 18,000 + 18,000 · 54,000——129%

TOSOT sheets of November 4, 2024, head sizes AirGreen offers. TOSOT recommends a ratio of 50 to 130%.

04 · Multi-zone

The multi-zone pages, each with its question

R-410ADual zoneYour pair of heads, compressor by compressor.R-410ATri-zoneYour line-set plan, checked against the sheet.R-410AFour zonesFour heads against one compressor.R-410AFive zonesWhat TOSOT really publishes for five rooms.R-410AUltraHeat dual zoneWhat the compressor keeps in deep cold.R-410ALomo 23 dual zoneStarting with a single head.R-410ALomo 23 tri-zoneThe compressor’s ceiling with three heads.TOSOTAll multi-zone unitsBoth compressor families, 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 TM18H5O, TM24H5O, TM36H5O and TM42H5O, dated November 4, 2024, tosot.com, read on November 5, 2026 (specifications, indoor-unit combination table and note on the capacity ratio).
  2. ENERGY STAR, “Certified Air-Source Heat Pumps” dataset (w7cv-9xjt), records 2409880, 2409879, 2415664 and 2415663 (AHRI 204344218 to 204344221), read again on November 5, 2026.
  3. Hydro-Québec, “Heat pump search tool”, list of October 7, 2026 (LogisVert amounts).
  4. TOSOT, “Heat Pumps” brochure in English, undated: note on the 24,000 BTU/h size with the 42,000 BTU/h compressors.

LogisVert amounts come from Hydro-Québec’s list on the date shown; only Hydro-Québec confirms the grant. AHRI numbers are those on our product pages, unchanged.