Only one of the 12 five-head combinations includes a 24,000 head: 9 + 9 + 9 + 9 + 24.
Sell sheet 92-7323-03, combination table
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Full AMERISTAR lineupAMERISTAR · Multi-zone · 19 Series · 5 zones
AMERISTAR 19 Series heat pump, 5 zones
Do your five heads fit on the 42,000 BTU/h unit? It is the only 19 Series unit that takes five, in 12 combinations the brand approves. Pick the five sizes: the tool answers yes or no and gives each room's share of the connected nominal.
- 1 kit · 42,000 BTU/h
- 5 wall heads
- SEER2 19 · HSPF2 10 (region IV) and 7.8 (region V) per NEEP
- ENERGY STAR cold climate
Five heads
Pick the head size for each room: the tool keeps the kits on which the brand approves that combination.
The 9 + 9 + 9 + 9 + 12 combination (thousands of BTU/h) is approved by the brand on the 42,000 BTU/h unit.
| Kit | At -15°C, NEEP value of the unit | Indicative amount (AirGreen's calculation) |
|---|---|---|
| 42,000 BTU/h | 32,400 BTU/h | $4,272 |
| Room | Head | Share of the connected nominal |
|---|---|---|
| Room 1 | 9,000 BTU/h | 19% |
| Room 2 | 9,000 BTU/h | 19% |
| Room 3 | 9,000 BTU/h | 19% |
| Room 4 | 9,000 BTU/h | 19% |
| Room 5 | 12,000 BTU/h | 25% |
| Total connected | 48,000 BTU/h | 100% |
Share: AirGreen's calculation on the heads' nominal sizes, rounded to the unit. NEEP lists one value per outdoor unit; the brand publishes no capacity per combination: the heat delivered depends on the heads connected.
Sources: AMERISTAR 19 Series Multi Zone sell sheet, 92-7323-03 (© 2024); NEEP cold-climate heat pump list, records 65383 to 65387 (modified Aug. 24, 2026); Hydro-Québec, LogisVert residential participation guide v1.10 (Appendix I) (Sept. 15, 2026)
On the 42,000 BTU/h unit: four or five heads
Combinations the brand approves on the 42,000 BTU/h unit, with four and with five heads.
| Heads | Approved combinations | Smallest combination | Connected nominal |
|---|---|---|---|
| 4 heads | 18 | 9 + 9 + 9 + 9 | 36,000 BTU/h |
| 5 heads | 12 | 9 + 9 + 9 + 9 + 9 | 45,000 BTU/h |
The outdoor units
| Unit | Model | AHRI | ENERGY STAR | Max. heads | At -8.3°C (NEEP) | At -15°C (NEEP) | Max. overcurrent protection (breaker) · sell sheet |
|---|---|---|---|---|---|---|---|
| 42,000 BTU/h | M4THM1942A15NA | 210488263 | 2415513 | 5 | 35,600 BTU/h | 32,400 BTU/h | 45 A |
Swipe the table to see every column.
Did you know?
The five heads can add up to 63,000 BTU/h nominal on the 42,000 unit, with 9 + 9 + 9 + 18 + 18 or 9 + 12 + 12 + 12 + 18.
Sell sheet 92-7323-03, combination table; sum calculated by AirGreen
LogisVert: indicative amount
ENERGY STAR cold-climate units: $120 per 1,000 BTU/h of heating at -8°C (17°F; NEEP writes it -8.3°C), per the LogisVert guide v1.10.
| Unit | Heating at -8.3°C listed on NEEP | Indicative amount |
|---|---|---|
| 42,000 BTU/h | 35,600 BTU/h | $4,272 |
AirGreen's calculation: guide v1.10 rate × heating at -8.3°C listed on NEEP.
These amounts are indicative. Only Hydro-Québec confirms the grant, based on its list in force on the installation date.
Frequently asked questions
Can fewer than five heads go on the 42,000 unit?
Yes: on the 42,000 BTU/h unit, the brand also approves combinations of 2, 3 and 4 heads.
Do five heads give more heat than four?
NEEP lists one value for the 42,000 BTU/h unit (32,400 BTU/h at -15°C); the brand publishes no value per combination. With five heads, that heat is shared between more rooms.
What LogisVert amount for a 5-zone kit?
An indicative amount of $4,272 for the 42,000 BTU/h unit, calculated by AirGreen at the guide's cold-climate rate. Only Hydro-Québec confirms the grant.
What AirGreen does
- An on-site assessment before the quote: the size is chosen in your home, not from a spec sheet.
- Installation by our technicians: connections, start-up and a walkthrough included.
- Montreal, Laval, Longueuil, the South Shore and the North Shore.
Sold and installed by AirGreen.
AMERISTAR limited warranty (sell sheet 92-7323-03 and warranty GW-600-2100A): 5 years on all parts, or 10 years (original purchaser) if the product is registered within 60 days of installation. Labour is not covered by the manufacturer. It applies to products installed in a residential or multi-family application. According to the brand, exclusions tied to registration and its transfer vary by province in Canada.
Sources
- AMERISTAR 19 Series Multi Zone sell sheet, 92-7323-03 · © 2024
- NEEP cold-climate heat pump list, records 65383 to 65387 · modified Aug. 24, 2026
- ENERGY STAR ductless heat pumps (Canadian market), 2415510, 2415482, 2415511 to 2415513 · data of Nov. 4, 2026
- Hydro-Québec, LogisVert residential participation guide v1.10 (Appendix I) · Sept. 15, 2026
- AMERISTAR ductless systems limited warranty, GW-600-2100A · © 2020
Sources read on Nov. 5, 2026. NEEP lists these values; it does not certify them.