514-316-2973
sales@airgreen.ca
Four RAM-G outdoor units, 2 to 5 heads, the same lowest heating temperature: -20°C. What separates them are Hitachi’s combination tables, published for three units out of four, and the 12 certificates that set the LogisVert amount. The planner below applies those tables room by room.
airHome MultiHeads accepted per Hitachi’s tables. Indicative LogisVert, all non-ducted configuration.
From 2 to 5 zones, all with wall heads. A mini-cassette, a floor console or a ducted head can be added on quotation.
Pick the number of rooms, then the type and size of each head. The planner tells you which outdoor units accept the combination according to Hitachi’s tables, why the others don’t, and which AHRI number and LogisVert amount apply.
2 outdoor units out of 4 take these rooms according to Hitachi’s tables. The RAM-G42N5HAA is confirmed with the distributor.
Only 2 connections: 3 rooms do not fit.
MCA / MOP · 50 m of line set in total
See this system in our shop12,000 + 9,000 + 9,000 = 30,000 BTU/h: a combination listed in Hitachi’s table 3.6.
MCA / MOP 19 / 35 A · 60 m of line set in total
See this system in our shop12,000 + 9,000 + 9,000 = 30,000 BTU/h: a combination listed in Hitachi’s table 3.7.
MCA / MOP 24 / 40 A · 70 m of line set in total
See this system in our shopHitachi publishes no combination table for this unit: we confirm each combination with the distributor.
MCA / MOP 30 / 50 A · 80 m of line set in total
See this system in our shopCombinations published by Hitachi (airHome Multi technical guide): RAM-G18N2HAA (table 3.5), 6 pairs of 7,000, 9,000 or 12,000 BTU/h heads, 24,000 BTU/h at most; RAM-G24N3HAA (table 3.6), 10 pairs and 13 triples of 7,000 to 18,000 BTU/h heads, no 22,000 or 24,000, 36,000 BTU/h at most; RAM-G36N4HAA (table 3.7), 21 pairs, 32 triples and 28 quadruples, some with an 18,000, 22,000 or 24,000 head, 48,000 BTU/h at most. A combination missing from its unit’s list is not allowed. RAM-G42N5HAA: Hitachi publishes no combination table; we confirm each combination with the distributor. Mini-cassettes and floor consoles count as non-ducted in the certificates; a RAD-GJ ducted head changes the AHRI number. In its tables, Hitachi lists the largest mini-cassette as size “22” (RAI-GJ22QHAA): it is the RAI-GJ24QHAA we sell as 24,000 BTU/h (technical guide: 24,000 BTU/h cooling, 20,500 BTU/h heating). The planner counts it as 22,000 on the RAM-G36N4HAA. Example sizes: each room’s size is worked out during the visit. Full LogisVert rules (eligibility, deadlines, documents): our LogisVert page.
Same R32 refrigerant, same -20°C lowest heating temperature, and the same two-cylinder rotary compressor on the three units in the technical guide. The rest changes: connections, accepted heads, electrical supply, and the only ENERGY STAR Cold Climate certificates (US market), the RAM-G24N3HAA’s.
Sold only as a 2-zone system
Among the units with a table, a 24,000 BTU/h head only goes on the RAM-G36N4HAA; on the RAM-G42N5HAA, it remains to be confirmed. The RAM-G24N3HAA stops at 18,000 and the RAM-G18N2HAA at 12,000: the heads each unit accepts set them apart as much as their output.
| Head | RAM-G18N2HAA | RAM-G24N3HAA | RAM-G36N4HAA | RAM-G42N5HAA |
|---|---|---|---|---|
| 7,000 BTU/h | yes | yes | yes | not published |
| 9,000 BTU/h | yes | yes | yes | not published |
| 12,000 BTU/h | yes | yes | yes | not published |
| 18,000 BTU/h | — | yes | yes | not published |
| 22,000 BTU/h our “24,000” mini-cassette | — | — | yes | not published |
| 24,000 BTU/h | — | — | yes | not published |
Tables 3.5 (RAM-G18N2HAA), 3.6 (RAM-G24N3HAA) and 3.7 (RAM-G36N4HAA) of Hitachi’s technical guide, re-read in full Oct. 28, 2026. In these tables, Hitachi lists the largest mini-cassette as size “22” (RAI-GJ22QHAA). The RAM-G42N5HAA is not in the guide.
Hitachi’s model lists put each head in a size: wall, mini-cassette, ducted and floor heads of the same size count the same, except the mini-cassette sold as 24,000, which counts as 22.
| Outdoor unit | Single heads | Pairs | Triples | Quadruples | Max connected | Window (spec row) |
|---|---|---|---|---|---|---|
| RAM-G18N2HAA | 7, 9, 12 | 6: 7+7, 7+9, 7+12, 9+9, 9+12, 12+12 | — | — | 24,000 BTU/h | not published |
| RAM-G24N3HAA | 7, 9, 12, 18 | 10, up to 18+18 | 13, incl. 7+7+18, 7+9+18 and 9+9+18 | — | 36,000 BTU/h | 2 to 3 heads, 14,000 to 36,000 BTU/h |
| RAM-G36N4HAA | 7, 9, 12, 18, 22, 24 | 21, up to 24+24 | 32, incl. 12+18+18, 12+12+24 and 7+18+22 | 28, incl. 7+7+7+24, 7+7+12+22 and 9+9+12+18 | 48,000 BTU/h | 2 to 4 heads, 14,000 to 48,000 BTU/h |
| RAM-G42N5HAA | not published | not published | not published | not published | not published | not published |
Sizes in thousands of BTU/h, as Hitachi writes them. Do the arithmetic: in each table, every combination of the allowed sizes whose total does not exceed the maximum connected capacity is listed, and no other. The tables also list single heads, but the spec rows of the RAM-G24N3HAA and RAM-G36N4HAA give at least 2 indoor units; none of our airHome Multi systems has fewer than two heads.
The RAM-G42N5HAA is in both airHome Multi brochures, but not in the technical guide: no combination table, no minimum number of heads, no capacity window. It is also the only unit with five connections. Before the quotation, we confirm each combination with the distributor.
The systems in our shop come with RAK-DJ or RAK-GJ wall heads. The three other families connect to the same outdoor units, within Hitachi’s tables.
7,000 to 24,000 BTU/h. The airHome Multi brochure labels it “400”; Hitachi’s documentation portal files the RAK-DJ-QHAA under “airHome 450” and under “airHome 400”. According to Hitachi, RAK-DJ-RHAA heads also fit the single-zone airHome 400.
7,000 to 24,000 BTU/h. Hitachi calls it “650” in the brochure and “airHome 650” on its portal. The suffix matters: the RAK-GJ…QHAA is the multi-zone head, the RAK-GJ…PHAA is the single-zone airHome 600. Optional Wi-Fi adapter, named “airCloud Go airHome 650 adapter”.
Five sizes, up to the “24,000”, rated 20,500 BTU/h in the brochure. 4-way airflow, motion sensor and ViroSense S filter. The mini-cassette page
7,000 to 24,000 BTU/h, “airHome Gainable” in French. The only head that changes the certificate: one ducted head in the system and the AHRI number becomes “mixed” or “all ducted”. The ducted page
7,000 to 18,000 BTU/h, no 24,000. On the wall or on the supplied stand, with a leak sensor, alarm light and buzzer. The console page
Hitachi lets you mix up to 5 indoor unit types. Each head keeps its own setpoint and fan speed, and can be switched off individually.
| Control | For | What Hitachi publishes |
|---|---|---|
| RC-AGU1EA0N | RAK-DJ heads (and RAD-GJ ducted) | wireless remote, technical guide |
| RC-AGS1EA0N | RAK-GJ heads and RAI-GJ mini-cassettes | “Standard” in the guide; the brochure describes it as an optional receiver kit with leak alarm |
| RC-BGH1FB0N · RC-BGH1FD0N | RAF-FJ floor consoles | two codes in the guide, without saying which is standard |
| SPX-WFA01 | Wi-Fi airCloud Go | optional adapter; head-by-head compatibility not published |
| SPX-URFG1 | wired wall controller | the brochure also names the airPoint Room H700 |
| Third-party thermostat | 5-wire connection | possible per the brochure, which notes that some advanced features are not enabled |
Source: airHome Multi brochure and technical guide. We confirm each head’s control before the quotation.
Pick a family and a size: the sheet gives the dimensions, the sound, the remote and, for each outdoor unit that accepts it, the adaptor Hitachi supplies depending on the port.
Stainless pre-filter, according to the technical guide.
Stainless pre-filter, according to the technical guide.
Stainless pre-filter, according to the technical guide.
The technical guide gives 22,000 BTU/h cooling and 58 dB(A) at the highest speed; the brochure, 24,000 BTU/h nominal and 53 dB(A).
Dimensions, lines, sound levels and remotes: airHome Multi brochure and technical guide. Adaptors: section 13.1 of the guide, which says these parts come with the outdoor unit and that the seal must always be fitted with the adaptor. The rule for which head goes on which port is not published.
Each outdoor unit carries an all non-ducted, a mixed and an all-ducted AHRI number. On the RAM-G18N2HAA and RAM-G24N3HAA, the amount does not move. On the RAM-G36N4HAA, it goes from $1,250 to $1,200, then $1,150. On the RAM-G42N5HAA, it drops to zero as soon as a ducted head joins the system. Tap a cell.
NEEP records (modified August 24, 2026) and ENERGY STAR, re-checked Oct. 28, 2026; Hydro-Québec: list read Oct. 14, 2026, amounts recomputed Oct. 28, 2026 from the certificates. Hydro-Québec pays per system, on the heat certified at -8.3°C (17°F), the point it calls -8°C: $120 per 1,000 BTU/h for an ENERGY STAR Cold Climate unit, $50 otherwise.
Hitachi writes that the airHome Multi keeps heating continuously down to -20°C, and all 12 certificates stop at that point. At Montréal-Trudeau, the overnight low fell below -20°C on 14.26 nights a year on average (1981-2010), 7.59 of them in January. Hitachi does not publish how the system behaves below that.
1981-2010 climate normals, Montréal-Trudeau, Environment and Climate Change Canada: average number of nights a year when the daily minimum went below each threshold. The station is at the airport; Laval and the North Shore can be colder.
Maximum capacity certified by NEEP at -20°C, “all non-ducted” certificates.
At -15°C and 85% relative humidity, Hitachi multiplies the heating capacity by 0.95 to account for defrosting.
At -10°C and 85% relative humidity, Hitachi multiplies the heating capacity by 0.95 to account for defrosting.
At -7°C and 85% relative humidity, Hitachi multiplies the heating capacity by 0.89 to account for defrosting.
At -5°C and 85% relative humidity, Hitachi multiplies the heating capacity by 0.85 to account for defrosting.
At 0°C and 85% relative humidity, Hitachi multiplies the heating capacity by 0.81 to account for defrosting.
From 7°C up, the factor is 1.0: no defrost correction.
Hitachi technical guide, section 3.4, for the RAM-G18N2HAA, RAM-G24N3HAA and RAM-G36N4HAA: the lowest factor in the table is at 0°C, not at -15°C. A defrost cycle lasts 12 minutes at most per the same section. Hitachi names no defrost technology.
For all four units, Hitachi publishes 25 m at most between units (“interunit”, which we read as per head), 5 m at least and 5 m of height between indoor units. The total, the electrical supply and the cabinet vary: the RAM-G42N5HAA is the only one with 23 m of total height, a 26 mm drain and two electrical tiers.
| Published value | RAM-G18N2HAA | RAM-G24N3HAA | RAM-G36N4HAA | RAM-G42N5HAA |
|---|---|---|---|---|
| Connections | 2 | 3 | 4 | 5 |
| Gas ports (in.) | 3/8 × 2 | 3/8 × 3 | 3/8 × 3 + 1/2 × 1 | 3/8 × 3 + 1/2 × 2 |
| Total line set | 50 m (165 ft) | 60 m (200 ft) | 70 m (230 ft) | 80 m (262 ft) |
| Total height | 20 m | 20 m | 20 m | 23 m |
| Chargeless / extra charge per metre | not published | 30 m / 12 g/m | 30 m / 12 g/m | not published |
| MCA / MOP | 16 / 25 A | 19 / 35 A | 24 / 40 A | 25 / 40 A (2 heads) · 30 / 50 A (3 to 5) |
| Recommended fuse (guide) | 20 A | 20 A | 25 A | not published |
| W × H × D | 850 × 750 × 298 mm 33.5 × 29.5 × 11.7 in. | 850 × 800 × 298 mm 33.5 × 31.5 × 11.7 in. | 850 × 800 × 298 mm 33.5 × 31.5 × 11.7 in. | 950 × 945 × 370 mm 37.4 × 37.2 × 14.6 in. |
| Net weight | 49 kg (108 lb) | 52 kg (Hitachi’s sheet also says 121 lb) | 74 kg (163 lb) | 98 kg (216.1 lb) |
| Drain | 16 mm | 16 mm | 16 mm | 26 mm |
| Outdoor sound, high | 52 dB(A) guide, cooling / heating 50 / 52 | 54 dB(A) guide, cooling / heating 52 / 54 | 56 dB(A) guide, cooling / heating 52 / 56 | 58 dB(A) |
airHome Multi brochures (EN and FR) and technical guide. Shared by all four units: 1/4 in. liquid ports, 25 m (82 ft) at most and 5 m (16 ft) at least per branch, 5 m between two heads. Hitachi does not define its labels: we read “interunit” as per branch, “total piping height” as the height between the outdoor unit and the heads, and “IDU height difference” as the gap between two heads. Sound: 1 m from the discharge grille, in an anechoic chamber. Power 208-230 V, single phase, 60 Hz; the heads are powered by the outdoor unit.
| Head line on port | Adaptor + seal | Torque |
|---|---|---|
| 1/2 → 3/8 | TA261D-4-001 + SEAL-3/8 | 30-40 N·m |
| 3/8 → 1/2 | TA261D-6-002 + SEAL-1/2 | 40-50 N·m |
| 5/8 → 1/2 | TA261D-7-003 + SEAL-1/2 | 40-50 N·m |
| 5/8 → 3/8 | ADAPTOR3-5 + SEAL-3/8 | 30-40 N·m |
Technical guide, section 13.1: adaptors supplied with the outdoor unit, size and quantity depending on the model.
The brochure says a snow protection accessory is available. Hitachi does not publish its part number, and we found no published installation manual for the outdoor unit: we choose the stand and its height during the visit.
The number of rooms decides which outdoor units are possible, and everything else follows: amounts, electrical supply, line length, published tables.
| Rooms | Outdoor units | LogisVert, all non-ducted | Cold climate | MCA / MOP | Total line set | Hitachi tables | Installations published |
|---|---|---|---|---|---|---|---|
| 2 zones | RAM-G18N2HAA RAM-G24N3HAA RAM-G36N4HAA RAM-G42N5HAA | $745 to $1,920 | RAM-G24N3HAA | 16 / 25 A 19 / 35 A 24 / 40 A 25 / 40 A | 50 m 60 m 70 m 80 m | RAM-G18N2HAA RAM-G24N3HAA RAM-G36N4HAA | 16 |
| 3 zones | RAM-G24N3HAA RAM-G36N4HAA RAM-G42N5HAA | $1,250 to $1,920 | RAM-G24N3HAA | 19 / 35 A 24 / 40 A 30 / 50 A | 60 m 70 m 80 m | RAM-G24N3HAA RAM-G36N4HAA | 16 |
| 4 zones | RAM-G36N4HAA RAM-G42N5HAA | $1,250 to $1,500 | none | 24 / 40 A 30 / 50 A | 70 m 80 m | RAM-G36N4HAA | 0 |
| 5 zones | RAM-G42N5HAA | $1,500 | none | 30 / 50 A | 80 m | no table | 0 |
AirGreen installations published as of Oct. 28, 2026 (“Nos réalisations” blog). Indicative LogisVert amounts: list read Oct. 14, 2026, amounts recomputed Oct. 28, 2026 from the certificates.
It depends on the outdoor unit: 2 connections on the RAM-G18N2HAA, 3 on the RAM-G24N3HAA, 4 on the RAM-G36N4HAA and 5 on the RAM-G42N5HAA. None of our systems has fewer than two heads.
No. Among the units with a table, the 24,000 head only goes on the RAM-G36N4HAA, like our “24,000” mini-cassette, which Hitachi lists as size 22. The RAM-G24N3HAA stops at 18,000 and the RAM-G18N2HAA at 12,000. For the RAM-G42N5HAA, which has no published table, we have the combination confirmed.
No: they count as non-ducted, like wall heads. Only a RAD-GJ ducted head changes the AHRI number, and sometimes the amount: $1,200 or $1,150 instead of $1,250 on the RAM-G36N4HAA, $0 on the RAM-G42N5HAA.
For the airHome Multi certificates, the ENERGY STAR list names the United States as the market. Hydro-Québec still accepts these certificates for LogisVert: the amounts on this page follow its list (list read Oct. 14, 2026, amounts recomputed Oct. 28, 2026 from the certificates).
Down to -20°C according to Hitachi, for all four units. Hitachi does not publish what happens below that. At Montréal-Trudeau, the overnight low fell below -20°C on 14.26 nights a year on average (1981-2010): we take it into account during the visit, with the heating you already have.
Hitachi writes: “Indoor units RAK-DJ-RHAA are compatible with airHome 400 single splits and airHome Multi multi-split systems.” We check the exact model and the combination before the quotation.
No, it is optional: SPX-WFA01 airCloud Go adapter, according to the brochure. Hitachi does not publish head-by-head compatibility; we confirm it.
Hitachi and AirGreen warranties: explained once for the whole brand, on the HITACHI page.
AirGreen, RBQ licence 5645-9605-01 (subclasses 15.8, 15.10 and 16). Hitachi lists “Airgreen Inc.”, in Boucherville, in its residential contractor directory.
No question matches. Call us at 514 316-2973.
We measure every room, choose the heads and the outdoor unit with you, and check the combination in Hitachi’s tables, or with the distributor for the RAM-G42N5HAA. The quotation shows your configuration’s AHRI number and the indicative LogisVert amount.
Hydro-Québec never solicits anyone by phone or door to door for LogisVert. If someone calls “on behalf of Hydro-Québec” to sell you a heat pump, hang up.
Monday to Thursday 8 a.m. to 6 p.m. · Friday 8 a.m. to 4 p.m.
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LogisVert amounts are indicative: the invoice must show the AHRI or ENERGY STAR number, and Hydro-Québec confirms eligibility and the amount when it processes the claim. Price on quotation.